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Macrospin and micromagnetic studies of tilted polarizer spin-torque nano-oscillators

Journal article
Authors Y. Zhou
H. Zhang
Y. W. Liu
Johan Åkerman
Published in Journal of Applied Physics
Volume 112
Issue 6
Pages 063903
ISSN 0021-8979
Publication year 2012
Published at Department of Physics (GU)
Pages 063903
Language en
Links dx.doi.org/10.1063/1.4752265
https://gup.ub.gu.se/file/86688
Keywords angular-dependence, wave excitations, driven, field, modulation, simulation, emission, devices
Subject categories Physical Sciences

Abstract

Using nonlinear dynamical systems theory, we analytically studied a spin-torque device in which the magnetization of the polarizer (the fixed layer) is tilted at an arbitrary angle out of the thin-film plane. While the analytical theory can determine the major features of the system, macrospin simulations were employed to demonstrate the unique characteristics of the system, such as the hysteretic switching between bistable states. Material dependencies of the dynamic and static state diagrams were also studied in the framework of the macrospin model. Full-scale micromagnetics simulations were finally performed to reveal more subtle features of the dynamics of such tilted polarizer systems. Both the macrospin and micromagnetics simulations gave quantitatively the same results as our analytical theory. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4752265]

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