Parallel-Pumped Instabilities in Magnetic Metal Films

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Abstract
Parallel-pumped instability (PPI) susceptibility measurements on several Permalloy magnetic metal films demonstrate a variety of microwave power and dc field-dependent effects. In the low-field spin-wave range, thick films may show either of two distinct kinds of behavior, or a combination of both. A qualitative explanation of these behaviors based on varying drive-field coupling to two different sets of modes with wave vectors perpendicular or parallel to the film plane and similar thresholds is suggested. Very thin films have a different characteristic behavior due to severe mode distortion caused by sample shape demagnetization. Lack of correlation between spin-wave relaxation rates and resonance linewidths suggests that inhomogeneous broadening is an important linewidth mechanism.

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