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arXiv · 2504.16250

Strain-Induced Enhancement of Spin Pumping in Pt/YIG Bilayers

Lara M. Solis·Santiago J. Carreira·Javier Gómez·Alejandro Butera·María Abellán·Carlos García·Fernando Bonetto·Paolo Vavassori·Javier Briático·Laura B. Steren·Myriam H. Aguirre
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Abstract

Enhancing spin-to-charge (S$\rightarrow$C) conversion efficiency remains a key challenge in spintronic materials research. In this work we investigate the effect of substrate-induced strains onto the S$\rightarrow$C efficiency. On one hand, we analyze strains-induced magnetic anisotropies in yttrium iron garnet (Y$_3$Fe$_5$O$_{12}$, YIG) by comparing the magnetic and structural properties of YIG films grown on Gd$_3$Ga$_5$O$_{12}$ (GGG) and (CaGd)$_3$(MgZrGa)$_5$O$_{12}$ (SGGG) substrates. Differences in lattice mismatch - YIG//GGG ($η= -0.06 \%$) and YIG//SGGG ($η= -0.83 \%$) - lead to out-of-plane tensile strains in the first case and unexpected compressive strain in the latter. On the other hand, we study the spin injection efficiency on Pt/YIG bilayers evaluated by the Inverse Spin Hall Effect (ISHE). We find that the resulting perpendicular magnetic anisotropy in YIG//SGGG, while not dominant over shape anisotropy, correlates with enhanced ISHE signals as observed in Spin Pumping Ferromagnetic Resonance (SP-FMR) and Spin Seebeck effect (SSE) experiments. Strain engineering proves effective in enhancing spin-to-charge conversion, providing insight into the design of efficient spintronic devices.

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Lara M. Solis, Santiago J. Carreira, Javier Gómez, Alejandro Butera, María Abellán, Carlos García, Fernando Bonetto, Paolo Vavassori, Javier Briático, Laura B. Steren, Myriam H. Aguirre. 2026-01-08. Strain-Induced Enhancement of Spin Pumping in Pt/YIG Bilayers. https://doi.org/10.1088/1361-6463%2Fae27dd

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