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APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 23
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Phys. Rev. Lett. 101, 237203 (2008) [4 pages]

Probing the Spin Polarization of Current by Soft X-Ray Imaging of Current-Induced Magnetic Vortex Dynamics

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Shinya Kasai1, Peter Fischer2, Mi-Young Im2, Keisuke Yamada1, Yoshinobu Nakatani3, Kensuke Kobayashi1, Hiroshi Kohno4, and Teruo Ono1
1Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
2Center for X-Ray Optics, Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, California 94720, USA
3University of Electro-communications, Chofu 182-8585, Japan
4Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan

Received 30 April 2008; published 4 December 2008

Time-resolved soft x-ray transmission microscopy is applied to image the current-induced resonant dynamics of the magnetic vortex core realized in a micron sized Permalloy disk. The high spatial resolution better than 25 nm enables us to observe the resonant motion of the vortex core. The result also provides the spin polarization of the current to be 0.67±0.16 for Permalloy by fitting the experimental results with an analytical model in the framework of the spin-transfer torque.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.237203
DOI:
10.1103/PhysRevLett.101.237203
PACS:
85.75.−d, 72.25.Ba, 72.25.Pn, 75.75.+a
 
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