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Magnetization reduction induced by nonlinear effects

G. de Loubens·V. V. Naletov·O. Klein
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Abstract

This letter reports the first detailed measurement of $M_z$, the component parallel to the effective field direction, when ferromagnets are excited by microwave fields at high power levels. It is found that $M_z$ drops dramatically at the saturation of the main resonance. Simultaneous measurements of $M_z$ and absorption power show that this drop corresponds to a diminution of the spin-lattice relaxation rate. These changes are interpreted as reflecting the properties of longitudinal spinwaves excited above Suhl's instability. Similar behavior should be expected in spinwave emission by currents.

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G. de Loubens, V. V. Naletov, O. Klein. 2004-11-11. Magnetization reduction induced by nonlinear effects. https://arxiv.org/abs/cond-mat/0405301

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