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Generation linewidth of mode-hopping spin torque oscillators

Journal article
Authors Ezio Iacocca
O. Heinonen
Pranaba Muduli Kishor
Johan Åkerman
Published in Physical Review B
Volume 89
Issue 5
ISSN 1098-0121
Publication year 2014
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevB.89.0544...
Keywords MAGNETIC DROPLET SOLITONS, MAGNETORESISTANCE, MULTILAYER, EXCITATION
Subject categories Physical Sciences

Abstract

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.

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