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

Abstract

We report the temperature dependence of the effective spin-mixing conductance between a normal metal (aluminium, Al) and a magnetic insulator (${\text{Y}}_3{\text{Fe}}_5{\text{O}}_{12}$, YIG). Non-local spin valve devices, using Al as the spin transport channel, were fabricated on top of YIG and SiO${}_2$ substrates. By comparing the spin relaxation lengths in the Al channel on the two different substrates, we calculate the effective spin-mixing conductance ($G_{\text{s}}$) to be $3.3\times 10^{12}$~${\Omega }^{-1}{\text{m}}^{-2}$ at 293~K for the Al/YIG interface. A decrease of up to 84\% in $G_{\text{s}}$ is observed when the temperature ($T$) is decreased from 293~K to 4.2~K, with $G_{\text{s}}$ scaling with $(T/T_{\text{c}}{)}^{3/2}$. The real part of the spin-mixing conductance ($G_{\text{r}}\approx 5.7\times 10^{13}{\Omega }^{-1}{\text{m}}^{-2}$), calculated from the experimentally obtained $G_{\text{s}}$, is found to be approximately independent of the temperature. We evidence a hitherto unrecognized underestimation of $G_{\text{r}}$ 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.

References in corpus (11)

• Spin Transfer Torques
• Spin Seebeck insulator
• Theory of spin Hall magnetoresistance
• Non-collinear Magnetoelectronics
• Spin convertance at magnetic interfaces
• Long-distance spin transport in a disordered magnetic insulator
• Spin Injection and Detection via the Anomalous Spin Hall Effect in a Ferromagnetic Metal
• Interfacial Spin and Heat Transfer between Metals and Magnetic Insulators
• Modulation of pure spin currents with a ferromagnetic insulator
• Control of spin current by a magnetic YIG substrate in NiFe/Al nonlocal spin valves
• Anisotropic Hanle lineshape via anisotropic magnetothermoelectric phenomena

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