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Spin transfer torque ferromagnetic resonance induced spin pumping in the Fe/Pd bilayer system

Journal article
Authors A. Kumar
S. Akansel
H. Stopfel
Masoumeh Fazlali
Johan Åkerman
R. Brucas
P. Svedlindh
Published in Physical Review B
Volume 95
Issue 6
ISSN 2469-9950
Publication year 2017
Published at Department of Physics (GU)
Language en
Links doi.org/10.1103/PhysRevB.95.064406
Keywords transparency, multilayers, Physics
Subject categories Condensed Matter Physics

Abstract

Inconsistencies in estimates of the spin Hall angle (theta(SH)) and spin diffusion length (lambda(SD)) of nonmagnetic (NM) layers using the spin transfer torque ferromagnetic resonance (ST-FMR) in ferromagnetic FM/NM bilayer structures are attributed to the inverse spin Hall effect (ISHE) and interfacial parameter contributions, interface spin transparency, interfacial anisotropic magnetoresistance, and effective spin-mixing conductance. These contributions in Fe(10 nm)/Pd(2-8 nm) bilayer structures have been probed employing the simultaneous detection of ST-FMR and ISHE in conjunction with in-plane FMR measurements. The interfacial contributions are found to increase with an increase in Pd layer thickness (t(NM)), which can be linked to the spin pumping effect in conjunction with spin backflow. Correcting the t(NM) dependence of the ST-FMR spectra for the interfacial and ISHE contributions prior to estimating theta(SH) and theta(SD) of the Pd layer, the estimated values are found to be 0.10 +/- 0.03 and 5.4 +/- 1.2 nm, respectively.

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