Generation linewidth of mode-hopping spin torque oscillators

Ezio Iacocca, Olle Heinonen, P. K. Muduli, Johan Åkerman

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29 Citations (Scopus)
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Experiments on spin torque oscillators commonly observe multimode signals. Recent theoretical works have ascribed the multimode signal generation to coupling between energy-separated spin wave modes. Here, we analyze in detail the dynamics generated by such mode coupling. We show analytically that the mode-hopping dynamics broaden the generation linewidth and makes it generally well described by a Voigt line shape. Furthermore, we show that the mode-hopping contribution to the linewidth can dominate, in which case it provides a direct measure of the mode-hopping rate. Due to the thermal drive of mode-hopping events, the mode-hopping rate also provides information on the energy barrier separating modes and temperature-dependent linewidth broadening. Our results are in good agreement with experiments, revealing the physical mechanism behind the linewidth broadening in multimode spin torque oscillators.
Original languageEnglish
Article number054402
JournalPhysical Review B
Issue number5
Publication statusPublished - 4 Feb 2014
Externally publishedYes


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