1 Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSD Present: Towards 1 Tb/sq. inch Objective: Stabilize magnetization of nanostructures.

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1 Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSD Present: Towards 1 Tb/sq. inch Objective: Stabilize magnetization of nanostructures for Tb/sq.inch recording applications: 1.Overcome the superparamagnetic limit. 2.Study the stabilization effect of exchange bias using a)SQUID b)MOKE c)FMR, neutron scattering (collaboration) 3.Implement integrated fabrication and testing of the nanometer-size nanodots. Potential Benefits to Air Force 1.Miniaturized Memory Elements 2.Terabit per sq. inch (10 12 /in 2 ) recording density 3.Orders of magnitude improvement in stability of the recorded information. 4.Potential Radiation Hardness Summary 1.Papers10 published, 3 submitted 2.Talks:17 Invited 16 Contributed 3.Patents:2 (pending) 4.Education:2 Undergraduate 2 Graduate students 5 Postdocs 2 Visitors 5.Collaborators38 6.Jobs:Academia: 3, grad. school: 1 7.Equipment: Preparation (Porous Al 2 O 3 ) Sensitive Low T Kerr Results 1.Fabrication of ordered magnetic nanodots arrays over 1cm 2 area using self-assembly. 2.Stabilization of nanodot magnetization. 3.Size-dependent modes of magnetic reversal in nanostructures.

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

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

4 Nanostructured Magnetism for Super-Dense Memories Ivan K. Schuller – UCSD Future: Beyond Terabits/Sq. Inch 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) Education and Extension 1.Education of Undergraduates, Graduate and Postdoctoral Fellows 2.Basic Researchers to Air Force Labs 3.Applied Researchers to Industrial Labs 4.Website on Novel High Density Recording 5.Movie for the General Public "When Things Get Small" AF parallelperpendicular Recording: