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- W4376653018 abstract "We simulate the magnetization dynamics of a permalloy spheroid of nanoscopic size in zero external field, such that both dipolar and exchange interactions are important. Low excitation power is used to obtain the frequencies and mode patterns of many normal modes. At higher power, non-linear three and four mode couplings between magnons carrying orbital angular momentum are observed to give rise to Suhl instabilities. Suhl's analysis of the selection rules governing the allowed processes is extended to initial states other than uniform precession. These rules are studied and confirmed by the simulations. Both down- and up-conversion are seen as well as three and four-mode processes. General trends are inferred for preferred instabilities among those that are allowed, although the thresholds for some instabilities appear to be very high." @default.
- W4376653018 created "2023-05-17" @default.
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- W4376653018 date "2023-05-13" @default.
- W4376653018 modified "2023-10-16" @default.
- W4376653018 title "Suhl Instabilities in Nanoscopic Spheroids" @default.
- W4376653018 doi "https://doi.org/10.48550/arxiv.2305.07986" @default.
- W4376653018 hasPublicationYear "2023" @default.
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