Time-domain measurements of nanomagnet dynamics driven by spin-transfer torques |
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| Authors: | Krivorotov I N Emley N C Sankey J C Kiselev S I Ralph D C Buhrman R A |
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| Institution: | Cornell University, Ithaca, NY 14853, USA. ink3@cornell.edu |
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| Abstract: | We present time-resolved measurements of gigahertz-scale magnetic dynamics caused by torque from a spin-polarized current. By working in the time domain, we determined the motion of the magnetic moment throughout the process of spin-transfer-driven switching, and we measured turn-on times of steady-state precessional modes. Time-resolved studies of magnetic relaxation allow for the direct measurement of magnetic damping in a nanomagnet and prove that this damping can be controlled electrically using spin-polarized currents. |
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