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Title: Control of spin current by a magnetic YIG substrate in NiFe/Al nonlocal spin valves
Authors: Dejene, F.K.
Vlietstra, N.
Luc, D.
Waintal, X.
Ben Youssef, Jamal
van Wees, B.J.
Issue Date: 2015
Publisher: © American Physical Society (APS)
Citation: DEJENE, F.K. ... et al, 2015. Control of spin current by a magnetic YIG substrate in NiFe/Al nonlocal spin valves. Physical Review B, 91 (10), 100404.
Abstract: We study the effect of a magnetic insulator [yttrium iron garnet (YIG)] substrate on the spin-transport properties of Ni80Fe20/Al nonlocal spin valve (NLSV) devices. The NLSV signal on the YIG substrate is about two to three times lower than that on a nonmagnetic SiO2 substrate, indicating that a significant fraction of the spin current is absorbed at the Al/YIG interface. By measuring the NLSV signal for varying injector-to-detector distances and using a three-dimensional spin-transport model that takes spin-current absorption at the Al/YIG interface into account, we obtain an effective spin-mixing conductance G↑↓ 5–8 × 1013 −1 m−2. We also observe a small, but clear, modulation of the NLSV signal when rotating the YIG magnetization direction with respect to the fixed spin polarization of the spin accumulation in the Al. Spin relaxation due to thermal magnons or roughness of the YIG surface may be responsible for the observed small modulation of the NLSV signal.
Description: This paper was published in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/physrevb.91.100404.
Version: Accepted for publication
DOI: 10.1103/physrevb.91.100404
URI: https://dspace.lboro.ac.uk/2134/36485
Publisher Link: https://doi.org/10.1103/physrevb.91.100404
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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