Minimum action paths for spin-torque assisted thermally induced magnetization reversal

Gabriel D. Chaves-O'Flynn, Daniel L. Stein, Andrew D. Kent, Eric Vanden Eijnden

Research output: Contribution to journalArticle

Abstract

We calculate the most probable reaction paths for thermally induced magnetization reversal of a nanomagnet under the influence of spin transfer torque. The presence of the spin transfer torque implies that the standard reaction rate theory of Kramers cannot be used since the dynamics no longer shows detailed balance and so the magnetization reversals are nonequilibrium transitions. Thin film nanomagnets with a biaxial anisotropy, a shape anisotropy that leads to in-plane magnetization with a preferred axis in the plane, are considered. The reaction pathways and rates are computed using geometrical Minimum Action Method. Our results indicate that the transition state has an out-of-plane magnetization component, in contrast to the case without an applied spin transfer torque.

Original languageEnglish (US)
Article number07C918
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Apr 1 2011

Fingerprint

torque
magnetization
anisotropy
reaction kinetics
thin films

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Minimum action paths for spin-torque assisted thermally induced magnetization reversal. / Chaves-O'Flynn, Gabriel D.; Stein, Daniel L.; Kent, Andrew D.; Vanden Eijnden, Eric.

In: Journal of Applied Physics, Vol. 109, No. 7, 07C918, 01.04.2011.

Research output: Contribution to journalArticle

Chaves-O'Flynn, Gabriel D. ; Stein, Daniel L. ; Kent, Andrew D. ; Vanden Eijnden, Eric. / Minimum action paths for spin-torque assisted thermally induced magnetization reversal. In: Journal of Applied Physics. 2011 ; Vol. 109, No. 7.
@article{cfcfddef97694c208bc201e9ab79070f,
title = "Minimum action paths for spin-torque assisted thermally induced magnetization reversal",
abstract = "We calculate the most probable reaction paths for thermally induced magnetization reversal of a nanomagnet under the influence of spin transfer torque. The presence of the spin transfer torque implies that the standard reaction rate theory of Kramers cannot be used since the dynamics no longer shows detailed balance and so the magnetization reversals are nonequilibrium transitions. Thin film nanomagnets with a biaxial anisotropy, a shape anisotropy that leads to in-plane magnetization with a preferred axis in the plane, are considered. The reaction pathways and rates are computed using geometrical Minimum Action Method. Our results indicate that the transition state has an out-of-plane magnetization component, in contrast to the case without an applied spin transfer torque.",
author = "Chaves-O'Flynn, {Gabriel D.} and Stein, {Daniel L.} and Kent, {Andrew D.} and {Vanden Eijnden}, Eric",
year = "2011",
month = "4",
day = "1",
doi = "10.1063/1.3565021",
language = "English (US)",
volume = "109",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

TY - JOUR

T1 - Minimum action paths for spin-torque assisted thermally induced magnetization reversal

AU - Chaves-O'Flynn, Gabriel D.

AU - Stein, Daniel L.

AU - Kent, Andrew D.

AU - Vanden Eijnden, Eric

PY - 2011/4/1

Y1 - 2011/4/1

N2 - We calculate the most probable reaction paths for thermally induced magnetization reversal of a nanomagnet under the influence of spin transfer torque. The presence of the spin transfer torque implies that the standard reaction rate theory of Kramers cannot be used since the dynamics no longer shows detailed balance and so the magnetization reversals are nonequilibrium transitions. Thin film nanomagnets with a biaxial anisotropy, a shape anisotropy that leads to in-plane magnetization with a preferred axis in the plane, are considered. The reaction pathways and rates are computed using geometrical Minimum Action Method. Our results indicate that the transition state has an out-of-plane magnetization component, in contrast to the case without an applied spin transfer torque.

AB - We calculate the most probable reaction paths for thermally induced magnetization reversal of a nanomagnet under the influence of spin transfer torque. The presence of the spin transfer torque implies that the standard reaction rate theory of Kramers cannot be used since the dynamics no longer shows detailed balance and so the magnetization reversals are nonequilibrium transitions. Thin film nanomagnets with a biaxial anisotropy, a shape anisotropy that leads to in-plane magnetization with a preferred axis in the plane, are considered. The reaction pathways and rates are computed using geometrical Minimum Action Method. Our results indicate that the transition state has an out-of-plane magnetization component, in contrast to the case without an applied spin transfer torque.

UR - http://www.scopus.com/inward/record.url?scp=79955453446&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955453446&partnerID=8YFLogxK

U2 - 10.1063/1.3565021

DO - 10.1063/1.3565021

M3 - Article

VL - 109

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 7

M1 - 07C918

ER -