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Temperature dependence of linewidth in nanocontact based spin torque oscillators: Effect of multiple oscillatory modes

Journal article
Authors Pranaba Muduli Kishor
O. G. Heinonen
Johan Åkerman
Published in Physical Review B
Volume 86
Issue 17
Pages 174408
ISSN 1098-0121
Publication year 2012
Published at Department of Physics (GU)
Pages 174408
Language en
Links dx.doi.org/10.1103/PhysRevB.86.1744...
Keywords magnetic multilayers, microwave generation, polarized current, nano-oscillators, excitation, waves, modulation
Subject categories Condensed Matter Physics

Abstract

We discuss the effect of mode transitions on the current (I) and temperature (T) dependent linewidth (Delta f) in nanocontact based spin torque oscillators (STOs). At constant I, Delta f exhibits an anomalous temperature dependence near the mode transitions; Delta f may either increase or decrease with T depending on the position w.r.t. the mode transition. We show that the behavior of Delta f as a function of I can be fitted by the single mode analytical theory of STOs, even though there are two modes present near the mode transition, if the nonlinear amplification is determined directly from the experiment. Using a recently developed theory of two coupled modes, we show that the linewidth near mode transition can be described by an "effective" single-oscillator theory with an enhanced nonlinear amplification that carries additional temperature dependence, which thus qualitatively explain the experimental results.

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