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Time Resolved X-ray Microscopy Reveals the Strength of Spin Torque

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http://www-cxro.lbl.gov/system/files/highlight_images/video_small.jpgTime-resolved high resolution magnetic soft X-ray microscopy of current induced resonant vortex core motion in a 1.5micrometer small permalloy (Fe80Ni20) disk allows the unambiguous determination of the spin polarization of current. This quantity characterizes the strength of spin torque effects. See a video that illustrates the vortex core motion. This work has been described by S. Kasai et al in Phys. Rev. Lett. 101 237203 (2008).