Control of spin current by a magnetic YIG substrate in NiFe/Al nonlocal spin valves

Abstract

We study the effect of a magnetic insulator (Yttrium Iron Garnet - YIG) substrate on the spin transport properties of Ni${}_{80}$Fe${}_{20}$/Al nonlocal spin valve (NLSV) devices. The NLSV signal on the YIG substrate is about 2 to 3 times lower than that on a non magnetic SiO${}_2$ 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 distance 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 $G_{\uparrow \downarrow }\simeq 5-8\times 10^{13}{\Omega }^{-1}$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.

9 pages, 6 figures, including supplementary information

References in corpus (5)

• Spin Seebeck insulator
• Theory of spin Hall magnetoresistance
• Theory of magnon-driven spin Seebeck effect
• Modulation of pure spin currents with a ferromagnetic insulator
• Spin torque and waviness in magnetic multilayers: a bridge between Valet-Fert theory and quantum approaches

Cited by in corpus (4)

• Spin Injection and Detection via the Anomalous Spin Hall Effect in a Ferromagnetic Metal
• Nonreciprocal superconducting transport and the spin Hall effect in gyrotropic structures
• Temperature dependence of the effective spin-mixing conductance probed with lateral non-local spin valves
• Magnonic spin Joule heating and rectification effects