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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 6
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Phys. Rev. Lett. 95, 067201 (2005) [4 pages]

Magnetization Reversal in Submicron Disks: Exchange Biased Vortices

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J. Sort1,*, A. Hoffmann2, S.-H. Chung2, K. S. Buchanan2, M. Grimsditch2, M. D. Baró1, B. Dieny3, and J. Nogués4
1Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
2Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
3SPINTEC (URA 2512 CNRS/CEA), CEA/Grenoble, 17 Av. Martyrs, 38054 Grenoble Cedex 9, France
4Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain

Received 10 March 2005; published 1 August 2005

Submicron, circular, ferromagnetic-antiferromagnetic dots exhibit different magnetization reversal mechanisms depending on the direction of the magnetic applied field. Shifted, constricted hysteresis loops, typical for vortex formation, are observed for fields along the exchange bias direction. However, for fields applied close to perpendicular to the exchange bias direction, magnetization reversal occurs via coherent rotation. Magnetic force microscopy imaging together with micromagnetic simulations are used to further clarify the different magnetic switching behaviors.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.067201
DOI:
10.1103/PhysRevLett.95.067201
PACS:
75.60.Jk, 75.70.Cn, 75.75.+a

*Electronic address: jordi.sort@uab.es

 
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