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Time-resolved imaging of spin transfer switching: beyond the macrospin concept
Y Acremann1, J P Strachan, V Chembrolu
1Stanford Synchrotron Radiation Laboratory, Stanford, California 94309, USA.
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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