Spin-transfer torque efficiency measured using a Permalloy nanobridge

Hickey, M.C.; Ngo, D.-T.; Lepadatu, S.; Atkinson, D.; McGrouther, D.; McVitie, S.; Marrows, C.H.

doi:10.1063/1.3520144

Spin-transfer torque efficiency measured using a Permalloy nanobridge

Hickey, M.C.; Ngo, D.-T.; Lepadatu, S.; Atkinson, D.; McGrouther, D.; McVitie, S.; Marrows, C.H.

Authors

M.C. Hickey

D.-T. Ngo

S. Lepadatu

Professor Del Atkinson del.atkinson@durham.ac.uk
Professor

D. McGrouther

S. McVitie

C.H. Marrows

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.

Citation

Hickey, M., Ngo, D., Lepadatu, S., Atkinson, D., McGrouther, D., McVitie, S., & Marrows, C. (2010). Spin-transfer torque efficiency measured using a Permalloy nanobridge. Applied Physics Letters, 97(20), Article 202505. https://doi.org/10.1063/1.3520144

Journal Article Type	Article
Publication Date	Nov 15, 2010
Deposit Date	Feb 3, 2012
Publicly Available Date	Oct 9, 2012
Journal	Applied Physics Letters
Print ISSN	0003-6951
Electronic ISSN	1077-3118
Publisher	American Institute of Physics
Peer Reviewed	Peer Reviewed
Volume	97
Issue	20
Article Number	202505
DOI	https://doi.org/10.1063/1.3520144

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Copyright Statement
© 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