Dependence of spin pumping and spin transfer torque upon Ni81Fe19 thickness in Ta/Ag/Ni81Fe19/Ag/Co2MnGe/Ag/Ta spin-valve structures

Durrant, C. J.; Shelford, L. R.; Valkass, R. A. J.; Hicken, R. J.; Figueroa, A. I.; Baker, A. A.; van der Laan, G.; Duffy, L. B.; Shafer, P.; Klewe, C.; Arenholz, E.; Cavill, S. A.; Childress, J. R.; Katine, J. A.

doi:10.1103/PhysRevB.96.144421

Title: Dependence of spin pumping and spin transfer torque upon ${Ni}_{81} {Fe}_{19}$ thickness in ${Ta / Ag / Ni}_{81} {Fe}_{19} {/ Ag / Co}_{2} MnGe / Ag / Ta$ spin-valve structures

Journal Article · Wed Oct 18 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.144421· OSTI ID:1421829

Durrant, C. J. ^[1]; Shelford, L. R. ^[1]; Valkass, R. A. J. ^[1]; Hicken, R. J. ^[1]; Figueroa, A. I. ^[2]; Baker, A. A. ^[2]; van der Laan, G. ^[2]; Duffy, L. B. ^[3]; Shafer, P. ^[4]; Klewe, C. ^[4]; Arenholz, E. ^[4]; Cavill, S. A. ^[5]; Childress, J. R. ^[6]; Katine, J. A. ^[6]

Univ. of Exeter, Exeter (United Kingdom)
Diamond Light Source, Didcot (United Kingdom)
Univ. of Oxford, Oxford (United Kingdom)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of York, York (United Kingdom)
HGST, San Jose, CA (United States)

Spin pumping has been studied within Ta / Ag / Ni₈₁Fe₁₉ (0–5 nm) / Ag (6 nm) / Co₂MnGe (5 nm) / Ag / Ta large-area spin-valve structures, and the transverse spin current absorption of Ni₈₁Fe₁₉ sink layers of different thicknesses has been explored. In some circumstances, the spin current absorption can be inferred from the modification of the Co₂MnGe source layer damping in vector network analyzer ferromagnetic resonance (VNA-FMR) experiments. However, the spin current absorption is more accurately determined from element-specific phase-resolved x-ray ferromagnetic resonance (XFMR) measurements that directly probe the spin transfer torque (STT) acting on the sink layer at the source layer resonance. Comparison with a macrospin model allows the real part of the effective spin mixing conductance to be extracted. We find that spin current absorption in the outer Ta layers has a significant impact, while sink layers with thicknesses of less than 0.6 nm are found to be discontinuous and superparamagnetic at room temperature, and lead to a noticeable increase of the source layer damping. For the thickest 5-nm sink layer, increased spin current absorption is found to coincide with a reduction of the zero frequency FMR linewidth that we attribute to improved interface quality. Furthermore, this study shows that the transverse spin current absorption does not follow a universal dependence upon sink layer thickness but instead the structural quality of the sink layer plays a crucial role.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1421829

Alternate ID(s):: OSTI ID: 1400009

Journal Information:: Physical Review B, Vol. 96, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Dependence of spin pumping and spin transfer torque upon ${Ni}_{81} {Fe}_{19}$ thickness in ${Ta / Ag / Ni}_{81} {Fe}_{19} {/ Ag / Co}_{2} MnGe / Ag / Ta$ spin-valve structures