Spin-Torque Ferromagnetic Resonance Measurements of Damping in Nanomagnets

Details Spin-Torque Ferromagnetic Resonance Measurements of Damping in Nanomagnets Spin-Torque Ferromagnetic Resonance Measurements of Damping in Nanomagnets

2007-03-22

arxiv.org/abs/cond-mat/0703577v1

Physics

Condensed Matter

Materials Science

13 pages, 2 figures

Scientific paper

10.1063/1.2768000

We measure the magnetic damping parameter a in thin film CoFeB and permalloy (Py) nanomagnets at room temperature using ferromagnetic resonance driven by microwave frequency spin-transfer torque. We obtain $\alpha_{CoFeB} = 0.014 \pm 0.003$ and $\alpha_{Py}=0.010 \pm 0.002$, values comparable to measurements for extended thin films, but significantly less than the effective damping determined previously for similar nanomagnets by fits to time-domain studies of large-angle magnetic excitations and magnetic reversal. The greater damping found for the large amplitude nanomagnet dynamics is attributed to the nonlinear excitation of non-uniform magnetic modes.

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