Spin transfer torque ferromagnetic resonance induced spin pumping in the Fe/Pd bilayer system
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 6, 064406Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2017. Vol. 95, no 6, 064406
Condensed Matter Physics Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-317587DOI: 10.1103/PhysRevB.95.064406ISI: 000393499800003OAI: oai:DiVA.org:uu-317587DiVA: diva2:1082526
FunderKnut and Alice Wallenberg Foundation, KAW 2012.0031