Controlling the Suhl instability: a numerical study

Details Controlling the Suhl instability: a numerical study Controlling the Suhl instability: a numerical study

2005-11-21

arxiv.org/abs/cond-mat/0511496v1

Physics

Condensed Matter

Materials Science

Scientific paper

Magnetization reversal (switching) using either r.f. fields or brute-force precessional switching is currently thought to ultimately be limited by the non-linear excitation of non-uniform spin waves, the so-called Suhl instability. Here we show (numerically, for the case of a sphere) that this instability can be suppressed by choosing the applied field and/or sphere diameter in such a way that the frequencies of the modes that can be excited through non-linear processes are off-resonance. While the results cannot be explained by a traditional model based on plane waves, they can be understood by projecting the actual state onto the small amplitude spin resonant eigenfunctions.

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