Probing the spin polarization of current by soft X-ray imaging of current-induced magnetic vortex dynamics

Shinya Kasai; Peter Fischer; Mi-Young Im; Keisuke Yamada; Yoshinobu Nakatani; Kensuke Kobayashi; Hiroshi Kohno; Teruo Ono

doi:10.1103/PhysRevLett.101.237203

Probing the spin polarization of current by soft X-ray imaging of current-induced magnetic vortex dynamics

Materials Science 2009-11-13 v1

Authors: Shinya Kasai , Peter Fischer , Mi-Young Im , Keisuke Yamada , Yoshinobu Nakatani , Kensuke Kobayashi , Hiroshi Kohno , Teruo Ono

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Abstract

Time-resolved soft X-ray transmission microscopy is applied to image the current-induced resonant dynamics of the magnetic vortex core realized in a micronsized 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.

Keywords

spin polarization magnetic vortex dynamics soft X-ray transmission microscopy spin-transfer torque Permalloy current-induced dynamics

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@article{arxiv.0807.1782,
  title  = {Probing the spin polarization of current by soft X-ray imaging of current-induced magnetic vortex dynamics},
  author = {Shinya Kasai and Peter Fischer and Mi-Young Im and Keisuke Yamada and Yoshinobu Nakatani and Kensuke Kobayashi and Hiroshi Kohno and Teruo Ono},
  journal= {arXiv preprint arXiv:0807.1782},
  year   = {2009}
}

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13 pages, 3 figures

Probing the spin polarization of current by soft X-ray imaging of current-induced magnetic vortex dynamics

Abstract

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