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arXiv · 1806.00658

Ultra-low damping insulating magnetic thin films get perpendicular

Lucile Soumah·Nathan Beaulieu·Lilia Qassym·Cécile Carrétéro·Eric Jacquet·Richard Lebourgeois·Jamal Ben Youssef·Paolo Bortolotti·Vincent Cros·Abdelmadjid Anane
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Abstract

A magnetic material combining low losses and large Perpendicular Magnetic Anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields. We report here on the growth of ultrathin Bismuth doped Y$_{3}$Fe$_{5}$O$_{12}$ (BiYIG) films on Gd$_{3}$Ga$_{5}$O$_{12}$ (GGG) and substituted GGG (sGGG) (111) oriented substrates. A fine tuning of the PMA is obtained using both epitaxial strain and growth induced anisotropies. Both spontaneously in-plane and out-of-plane magnetized thin films can be elaborated. Ferromagnetic Resonance (FMR) measurements demonstrate the high dynamic quality of these BiYIG ultrathin films, PMA films with Gilbert damping values as low as 3 10$^{-4}$ and FMR linewidth of 0.3 mT at 8 GHz are achieved even for films that do not exceed 30 nm in thickness. Moreover, we measure Inverse Spin Hall Effect (ISHE) on Pt/BiYIG stacks showing that the magnetic insulator$'$s surface is transparent to spin current making it appealing for spintronic applications.

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Lucile Soumah, Nathan Beaulieu, Lilia Qassym, Cécile Carrétéro, Eric Jacquet, Richard Lebourgeois, Jamal Ben Youssef, Paolo Bortolotti, Vincent Cros, Abdelmadjid Anane. 2018-06-02. Ultra-low damping insulating magnetic thin films get perpendicular. https://doi.org/10.1038/s41467-018-05732-1

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