Quantification of interfacial spin-charge conversion in metal/insulator hybrid structures by generalized boundary conditions

Applied Physics Letters 117, 142405 (2020)

Quantification of interfacial spin-charge conversion in metal/insulator hybrid structures by generalized boundary conditions

C. Sanz-Fernández, V. T. Pham, E. Sagasta, L. E. Hueso, I. V. Tokatly, F. Casanova, F. S. Bergeret

We present and verify experimentally a universal theoretical framework for the description of spin-charge interconversion in non-magnetic metal/insulator structures with interfacial spin-orbit coupling (ISOC). Our formulation is based on drift-diffusion equations supplemented with generalized boundary conditions. The latter encode the effects of ISOC and relate the electronic transport in such systems to spin loss and spin-charge interconversion at the interface, which are parameterized, respectively, by G∥/⊥ and σsc/cs. We demonstrate that the conversion efficiency depends solely on these interfacial parameters. We apply our formalism to two typical spintronic devices that exploit ISOC: a lateral spin valve and a multilayer Hall bar, for which we calculate the non-local resistance and the spin Hall magnetoresistance, respectively. Finally, we perform measurements on these two devices with a BiOx/Cu interface and verify that transport properties related to the ISOC are quantified by the same set of interfacial parameters.

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Doi
http://dx.doi.org/10.1063/5.0023992
arxiv
http://arxiv.org/abs/2007.01596

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