Igor V. Roshchin - Curriculum Vitæ

Igor V. Roshchin

Physics Department, Texas A&M University
College Station, TX, 77843-4242
Phone: (979) 845-8520 (w)
FAX: (979) 845-2590
e-mail: roshchin "at" physics.tamu.edu (business)
e-mail: igor "at" komkon.org (personal)

Objective: Fundamental and applied research on novel materials.

Professional summary:

I have over 10 years of interdisciplinary and collaborative research experience in solid state physics: superconductivity, semiconductors, magnetism, and nanotechnology.

I also have over 15 years of experience in teaching and supervising students at different levels. Degrees:

Ph.D. in Physics, 2000, University of Illinois at Urbana-Champaign.
Thesis: "Electronic and optical properties of thin-film superconductors and superconductor-semiconductor interfaces" (available electronically upon request).
M.S. in Physics, 1999, University of Illinois at Urbana-Champaign.
M.S. (Cum laude) in Physics, 1993, Moscow Institute of Physics and Technology (MIPT). Thesis: "Josephson properties of the grain boundaries of the BaPb_1-XBi_XO₃ bulk bicrystals".
Diploma of Higher Education (B.S. equiv.) (with distinction) 1993. Moscow Institute of Physics and Technology (MIPT).

Awards and Honors:

John D. and Catherine T. MacArthur Fellowship (1994)
Award of Excellence in Research, Moscow Physical Society, Russia (1993)
Moscow Government Fellowship for the Best Students (1991-1992)

Professional experience:

2008 — present: Assistant Professor,
Department of Physics and Astronomy, and Materials Science and Engineering,
Texas A&M University

Studies of magnetic nanostructures, and multilayers at nanoscale.
Studies of proximity effects (superoconducting and magnetic), including exchange bias.

Fabrication of macroscopic masks with 10-100 nm pores by aluminum anodization and other self-assembly methods.
Studies of how magnetic interface properties depend on the growth conditions.
Studies of exchange bias at nanoscale.

Studies of uncompensated magnetization in antiferromagnets

Low-magnetization measurements of thin film antiferromagnets (FeMn, FeF2, etc.)
Neutron relectivity studies of thin film antiferromagnets

2001 — 2008 Research Scientist and X-Ray Diffraction Facility Manager, UCSD
(with group of Prof. Ivan K. Schuller):

Studies of magnetic nanodots, and exchange bias at nanoscale.

Fabrication of macroscopic masks with 10-100 nm pores by aluminum anodization and other selfassembly methods.
Magnetic studies of magnetic nanodots by various techniques, including SQUID magnetometry, FMR, and other experimental techniques.
Micromagnetic simulations for nanodot structures.
Studies of exchange bias at nanoscale.

Demonstrated stabilization of Fe nanodot magnetization with exchange bias.
Experimentally observed vortex to single domain transition in Fe sub-100 nm nanodots.

Small angle neutron scattering (SANS) on nanodots

First to successfully perform SANS studies with polarization analysis on 65 nm nanodots.

Studies of exchange bias in thin films and multi-layers.

Fabrication of magnetic thin film and multi-layers (Fe/FeF₂, Fe/FeO_x, Fe₂₀Ni₈₀/FeF₂; Fe/Cr).
Magnetic and structural characterization of multilayers and nanostructures.

Established a new length scale in exchange bias: domain size of uncompensated magnetization in the antiferromagnet.
Experimentally observed the spin profile in exchange bias systems

Studies of magnetic tunnel junctions (MTJ).

Studies of field, temperature, barrier strength, and bias dependencies of electron tunneling characteristics in MTJ.

Demonstrated the origin of temperature dependence of TMR in MTJ's. Improved the model of thermal smearing in MTJ's.
Capillary condensation in nanopores

Studies of capillary condensation in alumina nanopores (optical interferometry)

Experimentally confirmed Kelvin equiation in capillary condensation in nanoporous alumina.
Experimentally confirmed Cohan model.

Nanostructures and devices for biomedical applications.

Studies of liquid condensation and evaporation in nanostructures.

Developed device concept and methods used for targeted drug delivery.
Developed device concept and methods used for controlled drug release.
Nanostructures and devices for intelligent sensors.

Nanoporous alumina-based chemical and biological sensors.
Fabrication of "Moth's eye" silicon structures, using macroscopic masks with 100-200 nm self-assembled pores produced by alumina anodization.
Fabrication of nano-porous electrodes, using 40-60 nm self-assembled pores produced by alumina anodization.

Studies of spin waves in thin film devices.
Experimentally observed spin wave propagation in thin film ferromagnetic spin-wave guide.
Observed frequency conversion in a spin-wave guide.

2000 — 2001: Research Scientist, NYU
(with group of Prof. A. D. Kent):

Studies of electron transport in magnetic field through ferromagnetic structures with a few quantum conduction channels:

Studies of ferromagnetic structures with sub-100 nm constrictions using MFM, magneto-optical Kerr effect, and magneto-transport measurements.

Demonstrated control of magnetic domain configuration and trapping of domain walls in 40-100 nm-wide planar Fe point-contact.

Fabrication of Fe thin film microstructures using photolithography (at Cornell Nanofabrication Facility).
Thin ferromagnetic films and multilayers fabrication for studies of magnetic and magnetotransport properties of micro- and nanoscopic structures.

1994 — 1999: Research with Prof. L. H. Greene (Thesis advisor), UIUC:
Research Assistant (1995 — 1999)
John D., Catherine T. MacArthur Fellow (1994)

Studies of the superconducting proximity effect in superconductor-semiconductor structures:

SQUID magnetometry, tunneling and Raman spectroscopy on Nb/InAs structures.
Fabrication of nano-structures on Nb/InAs using e-beam lithography.

First to optically observe proximity effect at a semiconductor/superconductor interface.

Growth and studies of structural and electronic properties of thin-film superconductors:

Improved growth techniques to fabricate very high-quality superconducting Nb and NbN thin films on insulators and semiconductors.

High-quality Nb films fabrication for direct observation of the superconducting energy gap in conductivity spectra by microwave and far infrared measurements; experimental data analysis and discussion.
Fabrication of Nb/Al multilayers for studies of vortex rotation in thin films by neutron scattering.

Studies of InAs near-surface electronic structure modified by ion-etch induced damage and chemical treatment of the surface:

Raman spectroscopy on InAs.

Developed a technique of surface passivation with self-assembled monolayers of alkanethiols, which preserves the near-surface electronic band structure of InAs.

1990 — 1993: Researcher, General Physics Institute of Russian Academy of Sciences, Moscow

Studies of bulk bicrystals of copperless oxide superconductors (BaPb_1-XBi_XO₃ and Ba_1-XKBi_XO₃)

Transport and magnetic properties of bulk bicrystals of copperless oxide superconductors (BaPb_1-XBi_XO₃ and Ba_1-XKBi_XO₃). Josephson behavior of the grain boundaries of these bicrystals.

Established anomalous behavior of the critical current of the bicrystals.

Magnetoresistance measurements of the specially doped semiconductor high magnetic field temperature sensors.

Built a cryogenic, high-magnetic field (13.5 Tesla) measurements system with Dr. V. Stepankin’s group; designed and built computer-assisted, automated control and data acquisition system for this measurement system, including computer software; wrote simulations and utility programs.

Patents

"Exchange-bias based multi-state magnetic memory and logic devices and magnetically stabilized magnetic storage" US Patent 7,764,454, July 27, 2010
"Exchange-bias based multi-state magnetic memory and logic devices and magnetically stabilized magnetic storage" (International Patent No. PCT/US05/025129, pending, 2005 - publication WO2006017367).
"Frequency mixer having ferromagnetic film" (US patent application; pub. no: US 2008/0224740 A1)
Other patent applications in progress: 2.

Skills and techniques:

Thin film growth by dc-magnetron sputter deposition, e-beam and thermal evaporation, maintenance and improvement of UHV-compatible dc-magnetron sputtering system and e-beam evaporator.
Materials analysis techniques: SEM, AFM, MFM, XPS, RBS, X-ray diffraction, magneto-optical Kerr effect measurements, profilometry.

Micro- and nano-fabrication techniques: optical and e-beam lithography, RIE and plasma processing; self-assembly techniques.

Electronic transport, tunneling spectroscopy, and SQUID magnetometry measurements, including cryogenic and high-magnetic field techniques.
Extensive computer skills, including various graphics, publishing, CAD, data acquisition and analysis software (Origin, Kaleidagraph, Mathematica, MathCAD, Labview, MS-Office, LaTeX, CorelDraw, AutoCAD, SYMBAD, etc.), application programming, system administration, etc.

Professional membership and activities

Program committee member, Joint MMM/Intermag conference.

Session Chair at MMM, Joint MMM/Intermag conferences, and APS March Meeting.

Referee for Physical Review Letters, Physical Review B, Applied Physics Letters, IEEE Transaction on Nanotechnology, Journal of Applied Physics, Journal of Magnetism and Magnetic Materials, IEEE Transactions on Magnetics.

Proposal referee for DoE (SBIR-STTR), FONDACYT, Hercules Foundation (Belgium), IRTAG program (TAMU), TAMU-CONACyT Collaborative Research Grant Program. IEEE Transactions on Magnetics, Journal of Magnetism and Magnetic Materials.

Member: American Physical Society, Materials Research Society

Teaching activities:

2008 — present: Teaching: Calculus-based Mechanics - Phys-218 (Mechanics for engineers), Phys-489: The Art Of Scientific Communication.

1995 — present: Supervised graduate, undergraduate, and high-school student research

Present: D. Kaya, P. Lapa, A. King,
Past:

Since 2008: J. D. Gonzales (B.S., 2010), H. Ponce (M.S., 2010), K. E. Badgley (M.S., 2010);
Before 2008: M. Erekhinsky, C. E. Chiang, Z.-P. Li, C.-P. Li, N. Bushong, C. Colesniuc, B. Oezyilmaz, F. V. Cerimele, J. Noel, M. Gandjian, D. Bird, N. Greenblatt, G. Kuchler, W. L. Murphy, M. T. Dearing, K. Ko, V. Gorodetskaya.

1995 — 1996: UIUC, Teaching Asst. - mathematical methods in physics, boundary problems (graduate level course)

1990 — 1992: MIPT Physical-Technical Correspondence School, physics and mathematics teacher

1990 — 1993, 1995: Lecturer at semiannual Young Scientists Society school

Publications:35 (30 in refereed journals) and 48 conference presentations

Publications:

Papers published and in press:

Igor V. Roshchin, Karie. E. Badgley, Mikhail Zhernenkov, Michael. R.Fitzsimmons, Maria Varela, Stephen J. Pennycook, Zhi-Pan Li, H. Ponce, A. H. Romero, Casey W. Miller, Ivan K. Schuller "Uncompensated Moments in Antiferromagnets: Origin, Properties and Role in Exchange Bias" Proc. of International Conference on Electromagnetics in Advanced Applications, 2010 - ICEAA '10, 20-24 Sept. 2010, 631-632; doi: 10.1109/ICEAA.2010.5651210

J. Mejia-Lopez, D. Altbir, P. Landeros, J. Escrig, A. H. Romero, I. V. Roshchin, C.-P. Li, M. R. Fitzsimmons, X. Batlle, and I. K. Schuller, "Development of vortex state in circular magnetic nanodots: theory and experiment", Phys. Rev. B, 81 184417 (2010); doi:10.1103/PhysRevB.81.184417

R. Morales, M. Velez, O. Petracic, Igor V. Roshchin, Z.-P. Li, X. Batlle, J. M. Alameda, and Ivan K. Schuller, "Three-dimensional spin structure in exchange-biased antiferromagnetic/ferromagnetic thin films" Applied Physics Letters, 95, 092503 (2009); doi:10.1063/1.3216055

Igor V. Roshchin, C. P. Li, Harry Suhl, Xavier Batlle, S. Roy, S. Sinha, S. Park, R. Pynn, M. Fitzsimmons, J. Mejia-Lopez, D. Altbir, A. H. Romero, R. Dumas, Kai Liu, and Ivan K. Schuller, "Magnetic vortices in Sub-100 nm magnets" Proc. of International Conference on Electromagnetics in Advanced Applications, 2009 - ICEAA '09, 14-18 Sept. 2009, 1028 - 1029; doi: 10.1109/ICEAA.2009.5297777

Igor V. Roshchin, C. P. Li, Harry Suhl, Xavier Batlle, S. Roy, S. Sinha, S. Park, R. Pynn, M. Fitzsimmons, J. Mejia-Lopez, D. Altbir, A. H. Romero, and Ivan K. Schuller, "Measurement of the vortex core in sub-100 nm Fe dots using polarized neutron scattering" EPL, 86, 67008, (2009).

M. R. Fitzsimmons, D. Lederman, M. Cheon, H. Shi, J. Olamit, I. V. Roshchin, and I. K. Schuller, " Antiferromagnetic domain size and exchange bias " Physical Review B, 77, 224406 (2008).

F. Casanova, C. E. Chiang, C.-P. Li, I. V. Roshchin, A. M. Ruminski, M. J. Sailor, and I. K. Schuller "Gas adsorption and capillary condensation in nanoporous alumina films" Nanotechnology, 19, 315709 (2008).

F. Casanova, C. E. Chiang, C.-P. Li, I. V. Roshchin, A. M. Ruminski, M. J. Sailor, and I. K. Schuller "Effect of surface interactions on the hysteresis of capillary condensation in nanopores" Europhysics Letters, 81, 26003 (2008).

A. Khitun, M. Bao, J-Y. Lee, K. L. Wang, D. W. Lee, S. Wang, and I. V. Roshchin, "Inductively Coupled Circuits with Spin Wave Bus for Information Processing" Journal of Nanoelectronics and Optoelectronics 3, 24-34 (2008). Preprint: Cond-Mat arXiv:0705.3864 or a local copy of the preprint.

R. K. Dumas, Chang-Peng Li, Igor V. Roshchin, Ivan K. Schuller, and Kai Liu, "Temperature Induced Single Domain - Vortex State Transition in sub-100nm Fe Nanodots" Applied Physics Letters, 91, 202501 (2007).

Zhi-Pan Li, Casey W. Miller, Igor V. Roshchin, and Ivan K. Schuller, "Origin of spontaneous magnetization reversal in exchange biased heterostructures" Physical Review B 76, 014423 (2007). (cond-mat/0612113)

R. K. Dumas, Chang-Peng Li, Igor V. Roshchin, Ivan K. Schuller, and Kai Liu, "Magnetic Fingerprints of sub-100 nm Fe Nanodots" Physical Review B 75, 134405 (2007).

M. R. Fitzsimmons, B. J. Kirby, S. Roy, Zhi-Pan Li, Igor V. Roshchin, S. K. Sinha, and Ivan K. Schuller, "Pinned magnetization in the antiferromagnet and ferromagnet of an exchange bias system" Physical Review B 75, 214412 (2007).

Chang-Peng Li, Igor V. Roshchin, Xavier Batlle, M. Viret, F. Ott, and Ivan K. Schuller, "Fabrication and structural characterization of highly ordered sub-100 nm planar magnetic nanodot arrays over 1 cm² coverage area." Journal of Applied Physics, 100, 074318 (2006).

J. Mejia-Lopez, D. Altbir, A. H. Romero, X. Batlle, Igor V. Roshchin, Chang-Peng Li, and Ivan K. Schuller, "Vortex state and effect of anisotropy in sub-100-nm magnetic nanodots" Journal of Applied Physics, 100, 104319 (2006).

I. V. Roshchin, O. Petracic, R. Morales, Z.-P. Li, X. Batlle, and I. K. Schuller, "Lateral length scales in exchange bias", Europhysics Letters, 71, 297-303, (2005)

S. Roy, M. R. Fitzsimmons, S. Park, M. Dorn, O. Petracic, I. V. Roshchin, Zhi-Pan Li, X. Batlle, R. Morales, A. Misra, X. Zhang, K. Chesnel, J. B. Kortright, S. K. Sinha and Ivan K. Schuller, "Depth profile of uncompensated spins in the antiferromagnetic layer of an exchange bias system", Physical Review Letters 95, 047201 (2005).

Justin Olamit, Elke Arenholz, Zhi-Pan Li, Oleg Petracic, Igor V. Roshchin, Ivan K. Schuller, and Kai Liu, "Loop bifurcation and magnetization rotation in exchange-biased Ni/FeF2", Physical Review B, 71, 012408 (2005).

O. Petracic, Zhi-Pan Li, Igor V. Roshchin, M. Viret, R. Morales, X. Batlle, and Ivan K. Schuller, "Bi-domain state in the exchange bias system FeF2/Ni" Applied Physics Letters, 87, 222509 (2005)

Featured in MRS Bulletin 28 (7), 530 (2003).

J. J. Akerman, I. V. Roshchin, J.M. Slaughter, R. W. Dave and I. K. Schuller "Origin of Temperature Dependence in Tunneling Magnetoresistance", Europhysics Letters 63(1), 104-110 (2003).

Kai Liu, L. Zhao, P. Klavins, F. E. Osterloh, J. Nogues, C. Leighton, H. Masuda, K. Nishio, I. V. Roshchin, and I. K. Schuller, "Synthesis and Thermal stability of nanomagnets", invited, Proceedings of the 10th Annual International Conference on Composites/Nano Engineering (ICCE 10), 429-430 (2003).

Kai Liu, J. Nogues, C. Leighton, H. Masuda, K. Nishio, I. V. Roshchin, and Ivan K. Schuller "Fabrication and Thermal Stability of Arrays of Fe Nanodots", Applied Physics Letters 81, 4434-4436 (2002).
This article also was selected for publication in the Virtual Journal of Nanoscale Science & Technology--December 9, 2002 Volume 6, Issue 24

I. V. Roshchin, J. Yu, A. D. Kent, G. W. Stupian, and M. S. Leung, "Magnetic Properties of Fe Microstructures with Focused Ion Beam-Fabricated Nano-Constrictions", IEEE Transactions on Magnetics 37 , 2101-2103 (2001). (preprint with good image quality)

I. V. Roshchin, A. C. Abeyta, L. H. Greene, T. A. Tanzer, J. F. Dorsten, P. W. Bohn, S.-W. Han, P. F. Miceli, J. F. Klem, "Observation of the Superconducting Proximity Effect in Nb/InAs and NbN_x/InAs by Raman Scattering", Physical Review B 66, 134530 (2002).
This article also was selected for publication in the Virtual Journal of Applications of Superconductivity--November 1, 2002 Volume 3, Issue 9

S.-W. Han, J. Farmer, H. Kaiser, P. F. Miceli, I. V. Roshchin, L. H. Greene, "Orientation of vortices in a superconducting thin film: Quantitative comparison of spin-polarized neutron reflectivity and magnetization", Physical Review B 62, 9784-9790 (2000).

T. A. Tanzer, P. W. Bohn, I. V. Roshchin, and L. H. Greene, "Ion-Etch Produced Damage on InAs(100) Studied through Collective-Mode Electronic Raman Scattering" Journal of Vacuum Science and Technology B 18(1), 144-149 , (2000). (errata)

T. A. Tanzer, P. W. Bohn, I. V. Roshchin, L. H. Greene, and J. F. Klem, "Near surface electronic structure on InAs (100) modified with self-assembled monolayers of alkanethiols", Applied Physics Letters, 75, 2794-2796, (1999).

A. V. Pronin, M. Dressel, A. Pimenov, A. Loidl, I. V. Roshchin, L. H. Greene "Direct Observation of the Superconducting Energy Gap Developing in the Conductivity Spectra of Niobium", Physical Review B 57, 14416-14421 (1998).

L. H. Greene, I. V. Roshchin, A. C. Abeyta, G. Kuchler, J. F. Dorsten, T. A. Tanzer, W. L. Feldmann, and P. W. Bohn, "Raman Scattering as a Probe of the Superconducting Proximity Effect", Plenary Proceedings of the XXI International Conference on Low-Temperature Physics (LT21), Prague, Czech Republic, August 8-14, 1996. Czechoslovak Journal of Physics 46, S6, 3115-3122 (1996).

L. H. Greene, J. F. Dorsten, I. V. Roshchin, A. C. Abeyta, T. A. Tanzer, W. L. Feldmann, and P. W. Bohn, "Optical Detection of the Superconducting Proximity Effect: Raman Scattering on Nb/InAs", Proceedings of the XXI International Conference on Low-Temperature Physics (LT-21), Prague, Czech Republic, August 8-14, 1996. Czechoslovak Journal of Physics 46, S2, 741-742 (1996)

L. H. Greene, A. C. Abeyta, I. V. Roshchin, I. K. Robinson, J. Dorsten, T. A. Tanzer, and P. W. Bohn, "Optical Detection of the Superconducting Proximity Effect" in "Spectroscopic Studies of Superconductors", Ivan Bozovic and Dirk van der Marel, editors (SPIE Proceedings # 2696, SPIE, Bellingham, 1996) p. 215.

V. Stepankin, I. Roshchin, A. Kuznetsov, "Reentrant low-temperature behavior of critical current of grain boundaries as universal feature of oxide superconductors", Proc. of the 7^th Int. Workshop on Critical Currents in Superconductors, World Scientific, 1994, 347-350.

I. Roshchin, V. Stepankin, and A. Kuznetsov, "Reentrant Superconductivity Transport Behavior of Single Grain Boundary Josephson Junction in BaPb_1-XBi_XO₃ Bicrystals", Journal of Low Temperature Physics, 100, 229-240, (1995) (abstract).

I. V. Roshchin, V. N. Stepankin, A. V. Kuznetsov, "Re-entrant Critical Current Behavior as a Common Feature of Single Grain Boundary Josephson Junctions in Bicrystals of Copperless Oxide Superconductors." IEEE Transactions on Applied Superconductivity 5, 1328-1330 (1995).

I. V. Roshchin, V. N. Stepankin, Yu. P. Yakovets, M. A. Baranov, A. V. Kuznetsov, D. I. Zhigunov, S. V. Sheeryaev, "Anomalous behavior of the critical current of a grain-boundary Josephson junctions in a bulk (Ba,K)BiO₃", JETP Letters, 59, 168-172 (1994) (Pis'ma V Zh. Eksp. Teor. Fiz., 59, 159-162 (1994)).

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Invited Talks:

"Uncompensated Moments in Antiferromagnets and Intrinsic Exchange Bias", Moscow International Symposium on Magnetism - MISM-2011, Moscow, Russia, August 22, 2011.

"Uncompensated Moments in Antiferromagnets and Intrinsic Exchange Bias", Seminar, Hitachi Global Storage Technologies, San Jose, California, USA, April 22, 2011.

"The Art of Science of Magentism at the Nanoscale", Materials Science and Engineering Seminar, Texas A&M University, USA, April 15, 2011.

"Uncompensated Moments in Antiferromagnets and Intrinsic Exchange Bias", Condensed Matter Seminar, Department of Physics and Astronomy, Texas A&M University, USA, February 18, 2011.

"Uncompensated Moments in Antiferromagnets and Intrinsic Exchange Bias", Seminar, Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, USA, January 27, 2011.

"Uncompensated moments in antiferromagnets: origin, properties and role in exchange bias", International Conference on Electromagnetics in Advanced Applications (ICEAA), Sydney, Australia, September 20, 2010.

"The Art and Science of Magnetism at Nanoscale ", public lecture, series: Saturday Morning Physics at Texas A&M, February 27, 2010.

"The Art and Science of Magnetism at Nanoscale ", seminar, Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional - CINVESTAV, Queretaro, Mexico, January 13, 2010.

"Vortices and Unusual Magnetic Properties of Nanodots", Condensed Matter Physics Seminar, University of Texas, Austin, October 6, 2009.

"Vortices and Unusual Magnetic Properties of Nanodots", Physics Seminar, INRIM, Turin, Italy, September 15, 2009.

"Magnetic Vortices in sub-100 nm Magnets", International Conference on Electromagnetics in Advanced Applications (ICEAA), Turin, Italy, September 14, 2009.

"Magnetic Nanodots: Vortex Core Measured with Polarized Neutrons", "Materials Across The Border", Texas A&M - CINVESTAV (Mexico) Workshop on Materials, College Station, TX, July 13-15, 2009.

"Capillary Condensation in Nanopores", Condensed Matter Physics Seminar, Texas A&M University, September 26, 2007.

"The Art and Science of Magnetism at Nanoscale", Summer School "Functional Materials", Puhajarve, Estonia, June 26-28, 2007.

"Magnetism at Nanoscale", Physics Seminar, National Institute of Chemical Physics and Biophysics, Tallinn, Estonia June 25, 2007.

"The Art and Science of Magnetism at Nanoscale", Physics Colloquium, Southern California University, April 2, 2007.

"The Art and Science of Magnetism at Nanoscale", Physics Colloquium, Colorado State University, March 20, 2007.

"The Art and Science of Magnetism at Nanoscale", Physics Colloquium, Purdue University, February 20, 2007.

"The Art and Science of Magnetism at Nanoscale", Physics Colloquium, Virginia Commonwealth University, February 13, 2007.

"Unusual Magnetic Properties of Nanostructures and Proximity Effect", Physics Colloquium, Texas A&M University, January 24, 2007.

"The Art and Science of Magnetism at Nanoscale", Physics Colloquium, The Catholic University of America, January 19, 2007.

"Vortices and Unusual Magnetic Properties of Nanodots", Condensed Matter Physics Seminar, University of California - San Diego, October 25, 2006.

"Magnetism at nanoscale: Science and Art", Interdepartmental Colloquium, Southern Ural State University, Chelyabinsk, Russia, September 20, 2006.

"Lateral Scales in Proximity Effect -- Exchange Bias", Division Seminar, Division of Low Temperature and Cryogenics, General Physics Institute of Russian Academy of Sciences, Moscow, Russia, September 15, 2006

"Magnetism of Nanostructures. Magnetic Vortices in Nanodots", Colloquium, Departments of Material Sciences and Inorganic Chemistry, Moscow State University, September 14, 2006

"Proximity Effects and Magnetism at Nanoscale", Physics Colloquium, Texas A&M University, April 5, 2006.

"Vortex State in Magnetic Nanodots", APS March Meeting, Baltimore, Maryland, March 13-17, 2006.

"The Art and Science of Magnetism at Nanoscale", Physics Colloquium, University of South Florida, March 7, 2006.

"Nanostructures and Magnetism", Physics Colloquium, Ohio University, January 26, 2006.

"Lateral Length Scales in Proximity Effect: Local Nature of Exchange Bias", Condensed Matter Seminar, University of Illinois at Urbana-Champaign, December 9, 2005.

"Nanodots and Magnetism", Physics Colloquium, California State University Northridge, November 16, 2005.

"Vortices in Nanostructured Magnets", 50th MMM conference, San Jose, CA, October 30, 2005

"Magnetic vortices in nanostructures", US-Spain Workshop on Nanoscale Materials, September 20-23, 2005 Segovia, Spain

"Magnetic Nanostructures", Physics Colloquium, Texas A&M University, January 26, 2005

"Lateral Length Scales in Proximity effect: Local nature of Exchange Bias", Seminar, Los Alamos National Laboratory, LANSCE, November 17, 2004.

"Proximity effect with inhomogeneous order parameters: Lateral length scale in exchange bias", Condensed Matter Division Seminar, CEA, Saclay, July 6, 2004.

"Magnetic Nanostructures", Colloquium, Syracuse University, February 10, 2004.

"Magnetic Nanodots: Magnetic Stabilization, Exchange Bias and Vortex State", Condensed Matter Seminar, Syracuse University, February 11, 2004.

"Magnetic Nanodots: vortex state, exchange bias, magnetization stabilization, and neutron studies", Condensed Matter Seminar, New York University, October 31, 2003.

"Magnetic Nanodots: vortex state, exchange bias, magnetization stabilization, and neutron studies", special seminar, DMSE, Massachusetts Institute of Technology, October 20, 2003.

"Magnetic Properties of Fe Nanodot Arrays", MRS Spring Meeting, San Francisco, CA, April 23, 2003.

"Nanotechnology and Magnetism", Special Interdepartmental Colloqium, Southern Ural State University, Chelyabinsk, Russia, October 8, 2002.

"Magnetism in nanostructures", Division Seminar, General Physics Institute of Russian Academy of Sciences, Moscow, Russia, October 2, 2002.

"Fabrication and magnetism of nanodots and wires with nanoconstrictions", Special Condensed Matter Seminar. University of Illinois at Urbana-Champaign. March 25 2002.

"Studies of the Proximity Effect in Superconductor-Semiconductor Structures Using Raman Spectroscopy", Almaden Research Center, IBM, San Jose, CA, October 2, 1999.

"Studies of the Proximity Effect in Superconductor-Semiconductor Structures Using Raman Spectroscopy", Lucent, Breinigsville, PA, September 17, 1999.

"Studies of the Proximity Effect in Superconductor-Semiconductor Structures Using Raman Spectroscopy", Bell Laboratories, Murray Hills, NJ, September 16, 1999.

Conference presentations:

"New Magnetic State and Origin of Uncompensated Magnetization in FeF2", 56th MMM Meeting, Scottsdale, AZ, November 3, 2011.
"Uncompensated Moments in Antiferromagnets and Intrinsic Exchange Bias", Moscow International Symposium on Magnetism (MISM-2011), Moscow, Russia, August 21-25, 2011 (invited).
"Intrinsic Exchange Bias and Origin of Uncompensated Magnetization in FeF2", APS March Meeting, Dallas, TX, March 24, 2011.
"Visualisation and Scientific Communication: Why and What can You do?", Workshop on visualization in science, Cooks Branch Reserve, TX, March 12, 2011
"Magnetic Nanodots: Vortex Core Measured and Calculated", TAMU-Conacyt Research Symposium, College Station, TX, March 2 2011
"Uncompensated Magnetization and Structure of FeF2" (poster), TAMU-Conacyt Research Symposium, College Station, TX, March 2 2011.
"Uncompensated Magnetization in FeF2 and Intrinsic Exchange Bias" 55th MMM Meeting, Atlanta, November 17, 2010.
"Uncompensated moments in antiferromagnets: origin, properties and role in exchange bias", (invited) International Conference on Electromagnetics in Advanced Applications (ICEAA), Sydney, Australia, September 20, 2010.
"Frustrations from Technologies - Is It Worth the Effort?", Conference "Teaching With Technologies", College Station, TX, February 10, 2010.
"Magnetic Vortices in sub-100 nm Magnets", International Conference on Electromagnetics in Advanced Applications (ICEAA), Turin, Italy, September 14, 2009 (invited).
"Magnetic Nanodots: Vortex Core Measured with Polarized Neutrons", "Materials Across The Border", Texas A&M - CINVESTAV (Mexico) Workshop on Materials, College Station, TX, July 13-15, 2009. (invited).
"Magnetic Nanodots: Vortex Core Measured with Polarized Neutrons." MRS Fall Meeting, Boston, December 4, 2008.
"Origin of uncompensated moments in antiferromagnets and their role in exchange bias." 53rd MMM Meeting, Austin, November 12, 2008.
"Uncompensated moments in antiferromagnets: Origin and role in exchange bias." APS March Meeting, New Orleans, Louisiana, March 10-14, 2008.
"Size dependence and metastability of the vortex state in magnetic nanodots" APS March Meeting, Denver, Colorado, March 5-9, 2007.
"Size and material dependence of in-plane and out-of-plane magnetic configurations in nanodots" 10th Joint MMM/Intermag Conference, Baltimore, Maryland, January 11, 2007.
"Effect of Anisotropy and Exchange Bias on Reversal of Sub-100 nm Magnetic Dots", Intermag, San Diego, California, May 11, 2006.
"Vortex State in Magnetic Nanodots", APS March Meeting, Baltimore, Maryland, March 13-17, 2006. (invited).
"Fabrication and magnetism of sub-100 nm exchange-biased magnetic dot arrays and porous networks.", APS March Meeting, Baltimore, Maryland, March 13-17, 2006
"Vortices in Nanostructured Magnets", 50th MMM conference, San Jose, CA, October 30-November 3, 2005 (invited).
"Magnetic vortices in nanostructures", US-Spain Workshop on Nanoscale Materials, September 20-23, 2005 Segovia, Spain (invited).
"Quantitative studies of the vortex state in sub-100 nm magnetic nanodots", APS March Meeting, Los Angeles, CA, March 21-25 2005.
"Lateral length scales and local character of exchange bias", APS March Meeting, Los Angeles, CA, March 21-25 2005.
"Lateral length scales and local nature of exchange bias", 47th MMM conference, Jacksonville , FL, November 5-11, 2004.
"Magnetic Nanodots: Exchange Bias, Vortex State, and Neutron Studies", APS March Meeting, Montreal, Quebec, Canada, March 22-26, 2004
"Imprinting Domain Wall into Antiferromagnet", APS March Meeting, Montreal, Quebec, Canada, March 22-26, 2004
"Magnetic Nanodots: magnetization stabilization, vortex state, exchange bias, and neutron studies", 9th Joint MMM-Intermag Conference , Anaheim, CA, January 5-9, 2004.
"Stabilization of Magnetism in Ferromagnetic Dot Arrays Towards Terrabit per Square Inch Storage", Non-Volatile Memory Technology Symposium, San Diego, CA, November 12, 2003.
"Magnetic Properties of Fe Nanodot Arrays", MRS Spring Meeting, San Francisco, CA, April 23, 2003 (invited).
"Inevitability of Thermal Smearing in Temperature-Dependent Electron Tunneling in MTJs", 47th MMM conference, Tampa, FL, November 2002.
"Fabrication and Magnetization Stabilization in Arrays of Fe Nanodots with Exchange Bias", APS March Meeting, Indianapolis, IN, March 2002.
"Influence of Barrier Oxidation Time on Temperature-Dependent Spin Polarization Decay in Magnetic Tunnel Junctions", APS March Meeting, Indianapolis, IN, March 2002.
"Origin of Temperature Dependence in Tunneling Magnetoresistance", APS March Meeting, Indianapolis, IN, March 2002.
"Magnetic and Transport Properties of Fe Microstructures with Focused Ion Beam-Fabricated Nano-Constrictions", APS March Meeting, Seattle, WA, March 2001.
"Magnetic and Transport Properies of Fe Microstructures with Focused Ion Beam-Fabricated Nano-Constrictions", Joint 8th MMM/Intermag Meeting, San Antonio, TX, USA, January 2001.
"Superconducting Proximity Effect in Superconductor/Semiconductor Lateral Structures", APS March Meeting, Atlanta, GA, USA, March 1999.
"Investigation of the proximity effect in superconductor/semiconductor interfaces using Raman spectroscopy", Gordon Research Conference, Plymouth, NH, USA, July 1998.
"Observation Of The Superconducting Energy Gap In The Conductivity Spectra Of Thin Niobium Films", APS March Meeting, Los Angeles, CA, USA, March 1998.
"Studies Of The Proximity Effect In Superconductor/Semiconductor Interfaces Using Raman Spectroscopy", APS March Meeting, Los Angeles, CA, USA, March 1998.
"Optical Observation of the Superconducting Proximity Effect", APS March Meeting, Kansas, MO, USA, March 1997.
"Optical Detection of the Superconducting Proximity Effect", APS March Meeting, St. Louis, MO, USA, March 1996.
"Electronic Transport Across Superconductor-Semiconductor Interfaces", MISSCON Workshop, Columbia, MO, USA, July 1995.
"Thermally Activated Phase Slippage Effects in Bicrystals of Oxide Superconductors", MRS Fall Meeting, Boston, MA, USA, November 1994.
"Re-entrant Critical Current Behavior as a Common Feature of Single Grain Boundary Josephson Junctions in Bicrystals of Copperless Oxide Superconductors", Applied Superconductivity Conference, Boston, MA, USA, October 1994.
"Reentrant behavior of critical current of single grain boundary in bicrystals as universal feature of oxide superconductors", MRS Spring Meeting, San Francisco, USA, April 1994.

Conference presentations of students:
(since 2009)

Dogan Kaya, "Effect of Cu Layer on FeMn Magnetic Properties" Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS, Commerce, TX, October 8, 2011
Andrew King, "Micromagnetic simulations of the transition between vortex and single-domain magnetization states in sub-100 nm nanodots" Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS, Commerce, TX, October 8, 2011
Karie E. Badgley, "Uncompensated Magnetization in FeF2$", Joint Fall 2010 Meeting of the Texas Sections of the APS, AAPT, Zone 13 of SPS and the National Society of Hispanic Physicists, San Antonio, TX, October 22, 2010
Karie E. Badgley, "Origin and Properties of Uncompensated Magnetization in FeF2", APS March Meeting, Portland, OR, March 15, 2010
Karie E. Badgley, "Origin and Properties of Uncompensated Magnetization in FeF2", Texas APS Section Meeting, San Marcos, TX, October 23, 2009.
Jacob D. Gonzales, "Automation of the Al anodization used for the fabrication of highly ordered sub- 100-nm nanopore arrays", Texas APS Section Meeting, San Marcos, TX, October 23, 2009.
H. Ponce, "Calculation of exchange coupling and magnetoanisotropy in antiferromagnetic materials from first principles", Second Chile-Mexico Workshop, Cocoyoc, Morelos, Mexico, January 5-8, 2010, - Awarded Best Poster Presentation.