Spin-transfer torque efficiency measured using a Permalloy nanobridge

Hickey, M.C., Ngo, D.-T., Lepatadu, S., Atkinson, D., McGrouther, D. , McVitie, S. and Marrows, C.H. (2010) Spin-transfer torque efficiency measured using a Permalloy nanobridge. Applied Physics Letters, 97(20), p. 202505. (doi:10.1063/1.3520144)

Hickey, M.C., Ngo, D.-T., Lepatadu, S., Atkinson, D., McGrouther, D. , McVitie, S. and Marrows, C.H. (2010) Spin-transfer torque efficiency measured using a Permalloy nanobridge. Applied Physics Letters, 97(20), p. 202505. (doi:10.1063/1.3520144)

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Publisher's URL: http://dx.doi.org/10.1063/1.3520144

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 H<sub>sw</sub> is modified by the application of a high current density (J<sub>dc</sub>) 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 xi=dH<sub>sw</sub>/dJ<sub>dc</sub>=0.027 +/- 0.001 Oe/MA cm(-2).

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McVitie, Professor Stephen and McGrouther, Dr Damien
Authors: Hickey, M.C., Ngo, D.-T., Lepatadu, S., Atkinson, D., McGrouther, D., McVitie, S., and Marrows, C.H.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Applied Physics Letters
Journal Abbr.:Appl. Phys. Lett.
ISSN:0003-6951
ISSN (Online):1077-3118

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