Time-resolved imaging of spin transfer switching: beyond the macrospin concept |
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Authors: | Acremann Y Strachan J P Chembrolu V Andrews S D Tyliszczak T Katine J A Carey M J Clemens B M Siegmann H C Stöhr J |
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Affiliation: | Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA. |
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Abstract: | Time-resolved images of the magnetization switching process in a spin transfer structure, obtained by ultrafast x-ray microscopy, reveal the limitations of the macrospin model. Instead of a coherent magnetization reversal, we observe switching by lateral motion of a magnetic vortex across a nanoscale element. Our measurements reveal the fundamental roles played independently by the torques due to charge and spin currents in breaking the magnetic symmetry on picosecond time scales. |
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