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arXiv · 1507.04567

Evaluation of the spin diffusion length of AuW alloy by spin absorption experiments in the limit of large spin-orbit interactions

P. Laczkowski·H. Jaffrès·W. Savero-Torres·J. -C. Rojas-Sánchez·Y. Fu·N. Reyren·C. Deranlot·L. Notin·C. Beigné·J. -P. Attané·L. Vila·J. -M. George·A. Marty
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Abstract

The knowledge of the spin diffusion length $\lambda_{A}$ is a prerequisite for the estimation of the spin Hall angle. We investigate spin current absorption of materials with small $\lambda_{A}$ using AuW stripes inserted in lateral spin-valves. Width variations of the AuW stripe lead to drastic changes of the spin absorption, which cannot be explained by conventional analysis. We show that the spin-current polarization and the spin accumulation attenuation in the vicinity of the spin absorber must to be precisely taken into account for accurate estimation of $\lambda_{A}$. We propose an analytical model supported by numerical calculations that allows to extract proper $\lambda_{A}$ values of spin Hall effect materials.

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P. Laczkowski, H. Jaffrès, W. Savero-Torres, J. -C. Rojas-Sánchez, Y. Fu, N. Reyren, C. Deranlot, L. Notin, C. Beigné, J. -P. Attané, L. Vila, J. -M. George, A. Marty. 2015-07-16. Evaluation of the spin diffusion length of AuW alloy by spin absorption experiments in the limit of large spin-orbit interactions. https://arxiv.org/abs/1507.04567

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