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Decoherence and Mode Hopping in a Magnetic Tunnel Junction Based Spin Torque Oscillator

Journal article
Authors Pranaba Muduli Kishor
O. G. Heinonen
Johan Åkerman
Published in Physical Review Letters
Volume 108
Issue 20
ISSN 0031-9007
Publication year 2012
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevLett.108....
Keywords polarized current, driven, multilayers, generation, emission
Subject categories Physical Sciences

Abstract

We discuss the coherence of magnetic oscillations in a magnetic tunnel junction based spin torque oscillator as a function of the external field angle. Time-frequency analysis shows mode hopping between distinct oscillator modes, which arises from linear and nonlinear couplings in the Landau-Lifshitz-Gilbert equation, analogous to mode hopping observed in semiconductor ring lasers. These couplings and, therefore, mode hopping are minimized near the current threshold for the antiparallel alignment of free-layer with reference layer magnetization. Away from the antiparallel alignment, mode hopping limits oscillator coherence.

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