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Reduction of the spin-wave damping induced by nonlinear effects

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PHYSICAL REVIEW B
卷 71, 期 18, 页码 -

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AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.180411

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This paper reports a 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 spin waves excited above Suhl's instability.

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