Major recent research projects and achievements of Igor V. Roshchin

(2001-present)

Studies of magnetic nanodots and exchange bias at nanoscale.

Studies of magnetic nanodots by various techniques (SQUID, MOKE magnetometry, FMR, etc.).

Fabrication of macroscopic masks with 10-100 nm self-assembled pores in anodized alumina.

Fabrication of macroscopic (>1cm2) arrays of sub-100 nm magnetic dots.

Micromagnetic simulations for nanodot structures.

Studies of exchange bias at nanoscale.

·       Experimentally observed vortex to single domain transition in Fe 30-100 nm nanodots.

·       Measured vortex core out-of-plane magnetization and size in 65 nm nanodots with polarized Small Angle Neutron Scattering.

·       Demonstrated stabilization of Fe nanodot magnetization with exchange bias.

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

Fabrication and magnetic and structural studies of magnetic thin films and multi-layers.

·       Demonstrated imprinting magnetic domains from a ferromagnet into an antiferromagnet in exchange-biased systems.

·       Discovered relevance of relative lateral length scales in exchange-bias.

·       Established depth profile of magnetic spins in exchange bias bilayers.

·       Discovered slow dynamics in exchange bias systems.

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.

Studies of photonic crystals-based sensors.

Label-free molecular biosensors based on thin film optical interferometry in porous thin films.

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 for metallophthalocyanine sensors, using 40-60 nm self-assembled pores produced by alumina anodization.

·       Observed and investigated capillary condensation in alumina nanopores (optical interferometry)

·       Demonstrated nanoporous alumina photonic crystal-based chemical and biological sensors.

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.

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.

This scheme demonstrates relation between different research projects:

scheme: research projects

Full CV of Igor V. Roshchin

Related publications: (full list)

Invited Talks:

  • "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.

Conference presentations:

  • "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.

Full CV