Enhancing Perpendicular Magnetic Anisotropy in Garnet Ferrimagnet by Interfacing with Few-Layer WTe<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 35099980.
- Also identified by DOI 10.1021/acs.nanolett.1c04237.
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Abstract
Engineering magnetic anisotropy in a ferro- or ferrimagnetic (FM) thin film is crucial in a spintronic device. One way to modify the magnetic anisotropy is through the surface of the FM thin film. Here, we report the emergence of a perpendicular magnetic anisotropy (PMA) induced by interfacial interactions in a heterostructure comprised of a garnet ferrimagnet, Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> (YIG), and a low-symmetry, high spin-orbit coupling (SOC) transition metal dichalcogenide, WTe<sub>2</sub>. At the same time, we also observed an enhancement in Gilbert damping in the WTe<sub>2</sub>-covered YIG area. Both the magnitude of interface-induced PMA and the Gilbert damping enhancement have no observable WTe<sub>2</sub> thickness dependence down to a single quadruple layer, indicating that the interfacial interaction plays a critical role. The ability of WTe<sub>2</sub> to enhance the PMA in FM thin film, combined with its previously reported capability to generate out-of-plane damping like spin torque, makes it desirable for magnetic memory applications.