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Objective: Stabilize magnetization of nanostructures for Tb/sqch recording applications:

Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSD Present: Towards 1 Tb/sq. inch. Summary Papers 10 published, 3 submitted Talks: 17 Invited 16 Contributed Patents: 2 (pending) Education: 2 Undergraduate 2 Graduate students 5 Postdocs 2 Visitors

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Objective: Stabilize magnetization of nanostructures for Tb/sqch recording applications:

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  1. Nanostructured Magnetism for Super-Dense MemoriesIvan K. Schuller – UCSDPresent: Towards 1 Tb/sq. inch • Summary • Papers 10 published, 3 submitted • Talks: 17 Invited 16 Contributed • Patents: 2 (pending) • Education: 2 Undergraduate 2 Graduate students 5 Postdocs 2 Visitors • Collaborators 38 • Jobs: Academia: 3, grad. school: 1 • Equipment: Preparation (Porous Al2O3) Sensitive Low T Kerr Objective: Stabilize magnetization of nanostructures for Tb/sq.inch recording applications: • Overcome the superparamagnetic limit. • Study the stabilization effect of exchange bias using • SQUID • MOKE • FMR, neutron scattering (collaboration) • Implement integrated fabrication and testing of the nanometer-size nanodots. • Potential Benefits to Air Force • Miniaturized Memory Elements • Terabit per sq. inch (1012/in2) recording density • Orders of magnitude improvement in stability of the recorded information. • Potential Radiation Hardness • Results • Fabrication of ordered magnetic nanodots arrays over 1cm2 area using self-assembly. • Stabilization of nanodot magnetization. • Size-dependent modes of magnetic reversal in nanostructures.

  2. Squareness Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSDMagnetic Nanodots: Fabrication and Characterization increased Accomplished:Increased squareness and enhanced coercivityfor Exchange Biased Dots K. Liu, J. Nogues, C. Leighton, H. Masuda,K. Nishio, I. V. Roshchin, and Ivan K. Schuller, Appl. Phys. Lett. 81, 4434 (2002). Developed: Fabrication of regular arrays of magnetic nanodots over 1 cm2

  3. 14 nm Mz Mz ~13 nm 65 nm Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSDVortex State Polarized Neutron Reflectometry Single Domain Vortex Simulation Vortex Core determined Demonstrated and Studied: Different Magnetic reversal: Vortex State—Single Domain

  4. AF AF Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSDFuture:BeyondTerabits/Sq. Inch Recording: Research: Year 1 - Decrease size of dots - Improve regularity - Stamping - Changing shapes - Technology Transfer (Porous Alumina) Year 2 - Other lithography methods (diblock copolymer) - New room temperature antiferromagnest (Fe oxides, IrMn,...) - Radiation Hardness of Antiferromagnets - Technology Transfer (New Antiferromagnets) Year 3 - Use of vortex state for recording - Vertical recording - Perpendicular anisotropy ferromagnets, antiferromagnets - Radiation Hardness of Exchange Biased Memory Elements - Technology Transfer (Perpendicular Recording) parallel perpendicular • Education and Extension • Education of Undergraduates, Graduate and Postdoctoral Fellows • Basic Researchers to Air Force Labs • Applied Researchers to Industrial Labs • Website on Novel High Density Recording • Movie for the General Public "When Things Get Small"

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