Ultra-low damping insulating magnetic thin films get perpendicular.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30135521.
- Also identified by DOI 10.1038/s41467-018-05732-1 and PMC identifier 6105659.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> (BiYIG) films on Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> (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<sup>-4</sup> 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.