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Temperature dependence of the effective spin-mixing conductance probed with lateral non-local spin valves

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posted on 2019-03-05, 10:00 authored by K.S. Das, Fasil DejeneFasil Dejene, B.J. van Wees, I.J. Vera-Marun
We report the temperature dependence of the effective spin-mixing conductance between a normal metal (aluminium, Al) and a magnetic insulator (Y3Fe5O12, YIG). Non-local spin valve devices, using Al as the spin transport channel, were fabricated on top of YIG and SiO2 substrates. By comparing the spin relaxation lengths in the Al channel on the two different substrates, we calculate the effective spin-mixing conductance (Gs) to be 3.3 × 1012 Ω−1m−2 at 293 K for the Al/YIG interface. A decrease of up to 84% in Gs is observed when the temperature (T) is decreased from 293 K to 4.2 K, with Gs scaling with (T /Tc)3/2. The real part of the spin-mixing conductance (Gr ≈ 5.7 × 1013 Ω−1m−2), calculated from the experimentally obtained Gs, is found to be approximately independent of the temperature. We evidence a hitherto unrecognized underestimation of Gr extracted from the modulation of the spin signal by rotating the magnetization direction of YIG with respect to the spin accumulation direction in the Al channel, which is found to be 50 times smaller than the calculated value.

Funding

This work was financed by the Zernike Institute for Advanced Materials, the Future and Emerging Technologies (FET) Programme within the Seventh Framework Programme for Research of the European Commission, under FET-Open Grant No. 618083 (CNTQC), and we acknowledge the NWO Spinoza prize awarded to Professor B. J. van Wees by NWO.

History

School

  • Science

Department

  • Physics

Published in

arXiv Condensed Matter

Citation

DAS, K.S. ... et al, 2019. Temperature dependence of the effective spin-mixing conductance probed with lateral non-local spin valves. Applied Physics Letters, 114 (7), 072405.

Publisher

AIP Publishing

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

2019-02-02

Publication date

2019-02-21

Notes

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters, 114 (7), 072405 and may be found at https://doi.org/10.1063/1.5086423.

ISSN

0003-6951

eISSN

1077-3118

Language

  • en

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