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Time-Domain Measurements of Nanomagnet Dynamics Driven by Spin-Transfer Torques

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Science  14 Jan 2005:
Vol. 307, Issue 5707, pp. 228-231
DOI: 10.1126/science.1105722

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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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