Spin-transfer torque efficiency measured using a Permalloy nanobridge | Zendy

M. C. Hickey | Zendy; Nguyen Ngoc Long | Zendy; Serban Lepadatu | Zendy; D. Atkinson | Zendy; D. McGrouther | Zendy; S. McVitie | Zendy; C. H. Marrows | Zendy

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Spin-transfer torque efficiency measured using a Permalloy nanobridge

Author(s) -

M. C. Hickey,

Nguyen Ngoc Long,

Serban Lepadatu,

D. Atkinson,

D. McGrouther,

S. McVitie,

C. H. Marrows

Publication year - 2010

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3520144

Subject(s) - permalloy , magnetoresistance , condensed matter physics , microscale chemistry , antiparallel (mathematics) , spin transfer torque , magnetization , materials science , torque , current density , spin (aerodynamics) , magnetic field , physics , mathematics education , mathematics , quantum mechanics , thermodynamics

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.

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