Perpendicular spin valves with ultra-thin ferromagnetic layers

Details Perpendicular spin valves with ultra-thin ferromagnetic layers Perpendicular spin valves with ultra-thin ferromagnetic layers

2005-04-27

arxiv.org/abs/cond-mat/0504705v2

Phys. Rev. B 73, 054407 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 mages 10 figures

Scientific paper

We address two finite size effects in perpendicular transport through magnetic multilayers. When the magnetic layer thickness in spin valves becomes of the order or smaller than the spin-flip diffusion length, structural asymmetries affect the transport properties. A magnetic layer with thickness approaching the magnetic coherence length becomes transparent for spin currents polarized perpendicular to the magnetization. We use the generalized magnetoelectronic circuit theory to investigate both effects on the angular magnetoresistance (aMR) and spin transfer torque. We analyze recent aMR experiments to determine the spin-flip diffusion length in the ferromagnet as well as the interface spin-mixing conductance and propose a method to measure the ferromagnetic coherence length.

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