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Physical Sciences : Other
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Ferromagnetic Nanorings (JHU Ref 4635)
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Magnetic nanorings can maintain stable vortex states and hold the potential for information storage. We have fabricated symmetric nanorings on a macroscopic area with ultrahigh areal density. But symmetric nanorings, when the size is about 100 nm, have only 40% of chances to obtain the vortex states, as found by our group recently. In this application, we also disclose a new process for fabricating asymmetric ferromagnetic nanorings. Unlike symmetric rings, the percentage of vortex states in asymmetric rings can be well controlled from 41% to nearly 100% by changing the field angle (0o to 90o). This is of interest to applications in storage devices.
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Inventors
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Frank Zhu, M.A.; Chia-Ling Chien, Ph.D.
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Keywords
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memory devices, magnetic storage
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Patents
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Patent pending
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Reference
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1] M. Hehn, K. Ounadjela, J. P. Bucher, F. Rousseaux, D. Decanini, B. Bartenlian, C. Chappert, Science 1996, 272, 1782. [2] K. J. Kirk, J. N. Chapman, S. McVitie, P. R. Aitchison, C. D. W. Wilkinson, Appl. Phys. Lett. 1999, 75, 3683 [3] M. Herrmann, S. McVitie, J. N. Chapman, J. Appl. Phys. 2000, 87, 2994 [4] C. A. Ross, Annu. Rev. Mater. Res. 2001, 31, 203 [5] M. Demand, M. Hehn, K. Ounadjela, R. L. Stamps, E. Cambril, A. Cornette, F. Rousseaux, J. Appl. Phys. 2000, 87, 5111 [6] T. Shinjo, T. Okuno, R. Hassdorf, K. Shigeto, T. Ono, Science 2000, 289, 930 [7] M. Schneider, H. Hoffmann, J. Zweck, Appl. Phys. Lett. 2001, 79, 3113 [8] A. Wachowiak, J. Wiebe, M. Bode, O. Pietzsch, M. Morgenstern, R. Wiesendanger, Science 2002, 298, 577 [9) L.D. Buda, I.L. Prejbeanu, U. Ebels, K. Ounadjela, JMMM 2002, 242-245, 996 [10] M. Rahm, M. Schneider, J. Biberger, R. Pulwey, J. Zweck, D. Weiss, V. Umansky, Appl. Phys. Lett. 2003, 82, 4110 [11] F. Q. Zhu, D. L. Fan, X. C. Zhu, J. G. Zhu, R. C. Cammarata, C. L. Chien, Advanced Materials 2004, 16, 2155 [12] P. Hanarp, D. S. Sutherland, J. Gold, B. Jasemo, Colloids and Surfaces A 2003, 214, 23 [13] J. G. Zhu, Y. Zheng, G. A. Prinz, J. Appl. Phys. 2000, 87, 6668
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Commercial Uses
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(1). Hard drive (2). Non-volatile memory device (3). Nanoscale tool for trapping cells or macromolecules (4). Building blocks for nanodevices
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Goal
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Johns Hopkins University is seeking licensees for this technology
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Stage of Development
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Discovery
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Applicable Categories
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Physical Sciences
» Other
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Contact
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Jacqueline Walker
The Johns Hopkins University
100 North Charles Street, 5th Floor
Baltimore, Maryland 21201
Email: jwalke50@jhmi.edu
Phone:410-516-8300
Fax: 410-516-4411
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