Spin-transfer-driven ferromagnetic resonance of individual nanomagnets

Details Spin-transfer-driven ferromagnetic resonance of individual nanomagnets Spin-transfer-driven ferromagnetic resonance of individual nanomagnets

2006-02-04

arxiv.org/abs/cond-mat/0602105v1

Physics

Condensed Matter

Materials Science

19 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.227601

We demonstrate a technique that enables ferromagnetic resonance (FMR) measurements of the normal modes for magnetic excitations in individual nanoscale ferromagnets, smaller in volume by a factor of 1000 than can be probed by other methods. The measured peak shapes indicate two regimes of response: simple FMR and phase locking. Studies of the resonance frequencies, amplitudes, and linewidths as a function of microwave power, DC current, and magnetic field provide detailed new information about the exchange, damping, and spin-transfer torques that govern the dynamics in magnetic nanostructures.

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