Determining vortex chirality in ferromagnetic ring by lateral nonlocal spin valve

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Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan [1 ]
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Journal of Applied Physics | 2008年 / 103卷 / 07期
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We demonstrate detecting chirality of vortex state in a magnetic ring by lateral nonlocal spin-valve (NLSV) measurement. A Permalloy (Py) ring; a Py narrow wire; and copper contacts were used as spin injector; detector; and the normal-metal diffusive channel; respectively. By comparing the anisotropic magnetoresistance loop of the individual ring with NLSV loop; the vortex chirality and the related switching field of the ring can be determined. Both onion-to-vortex transition field and vortex chirality were found to alternate in both the same and different current probe arrangements on the magnetic ring. © 2008 American Institute of Physics;
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