Proposal of a Robust Measurement Scheme for the Nonadiabatic Spin Torque Using the Displacement of Magnetic Vortices

Benjamin Krüger, Massoud Najafi, Stellan Bohlens, Robert Frömter, Dietmar P. F. Möller, and Daniela Pfannkuche
Phys. Rev. Lett. 104, 077201 – Published 17 February 2010
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Abstract

A spin-polarized current traversing a ferromagnet with continuously varying magnetization exerts a torque on the magnetization. The nonadiabatic contribution to this spin-transfer torque is currently under strong debate, as its value differs by orders of magnitude in theoretical predictions and in measurements. Here, a measurement scheme is presented that allows us to determine the strength of the nonadiabatic spin torque accurately and directly. Analytical and numerical calculations show that the scheme is robust against the uncertainties of the exact current direction and Oersted fields.

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  • Received 15 May 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.077201

©2010 American Physical Society

Authors & Affiliations

Benjamin Krüger1, Massoud Najafi2, Stellan Bohlens1, Robert Frömter3, Dietmar P. F. Möller2, and Daniela Pfannkuche1

  • 1I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg, Germany
  • 2Arbeitsbereich Technische Informatik Systeme, Universität Hamburg, Vogt-Kölln-Str. 30, 22527 Hamburg, Germany
  • 3Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

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Issue

Vol. 104, Iss. 7 — 19 February 2010

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