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Micromagnetic study of switching boundary of a spin torque nanodevice

Journal article
Authors Yan Zhou
Johan Åkerman
Jonathan Sun
Published in Applied Physics Letters
Volume 98
Issue 10
Pages 102501
ISSN 0003-6951
Publication year 2011
Published at Department of Physics (GU)
Pages 102501
Language en
Links dx.doi.org/10.1063/1.3561753
Keywords Magnetism, Spintronics
Subject categories Magnetism, Other engineering physics

Abstract

Abstract: We report on a numerical study of the micromagnetic switching process of a nanostructured spin torque device. We show that incoherent spin waves can be excited over a wide range of current and field even at zero temperature. These large amplitude, incoherent, and nonzero k spin wave modes are shown to alter the switching phase boundary from that calculated within a macrospin model. The presence of telegraphic transitions between different spin wave modes may also contribute to the so-called back-hopping phenomenon where the switching probability varies nonmonotonically with increasing bias current. (C) 2011 American Institute of Physics. [doi:10.1063/1.3561753]

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