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Spin-transfer torque efficiency measured using a Permalloy nanobridge.

Hickey, M.C. and Ngo, D.-T. and Lepadatu, S. and Atkinson, D. and McGrouther, D. and McVitie, S. and Marrows, C.H. (2010) 'Spin-transfer torque efficiency measured using a Permalloy nanobridge.', Applied physics letters., 97 (20). p. 202505.

Abstract

We report magnetoresistance, focused Kerr effect, and Lorentz microscopy experiments performed on a nanoscale Permalloy bridge connecting microscale pads. These pads can be switched from a parallel to antiparallel state through the application of small fields, causing a detectable magnetoresistance. We show that this switching field Hsw is modified by the application of a high current density (Jdc) through spin-transfer torque effects, caused by the spin-current interacting with the magnetization gradients generated by the device geometry, yielding an estimate for the spin-transfer torque efficiency ξ = dHsw/dJdc = 0.027±0.001 Oe/MA cm−2.

Item Type:Article
Full text:PDF - Published Version (421Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.3520144
Publisher statement:Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Hickey, M.C. and Ngo, D.-T. and Lepadatu, S. and Atkinson, D. and McGrouther, D. and McVitie, S. and Marrows, C.H. (2010) 'Spin-transfer torque efficiency measured using a Permalloy nanobridge.', Applied physics letters., 97 (20). p. 202505 and may be found at http://dx.doi.org/10.1063/1.3520144
Record Created:27 Sep 2012 13:50
Last Modified:09 Oct 2012 14:36

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