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Science 14 January 2005:
Vol. 307. no. 5707, pp. 228 - 231
DOI: 10.1126/science.1105722
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Reports

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

I. N. Krivorotov,* N. C. Emley, J. C. Sankey, S. I. Kiselev, D. C. Ralph, R. A. Buhrman

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.

Cornell University, Ithaca, NY 14853, USA.

* To whom correspondence should be addressed. E-mail: ink3{at}cornell.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)