Investigation of the Role of Rare-Earth Elements in Spin-Hall Topological Hall Effect in Pt/Ferrimagnetic-Garnet Bilayers.
basic_science · Level V
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- Record sourced from PubMed, PMID 32459494.
- Also identified by DOI 10.1021/acs.nanolett.0c01620.
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Abstract
Topological magnetic textures such as skyrmions are being extensively studied for their potential application in spintronic devices. Recently, low-damping ferrimagnetic insulators (FMI) such as Tm<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> have attracted significant interest as potential candidates for hosting skyrmions. Here, we report the detection of the spin-Hall topological Hall effect (SH-THE) in Pt/Tm<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and Pt/Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> bilayers grown on various orientations of Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> substrates as well as on epitaxial buffer layers of Y<sub>3</sub>Sc<sub>2</sub>Al<sub>3</sub>O<sub>12</sub>, which separates the FMI from the substrate without sacrificing the crystal quality. The presence of SH-THE in all of the bilayers and trilayers provides evidence that rare-earth ions in either the FMI or substrate may not be critical for inducing an interfacial Dzyaloshinskii-Moriya interaction that is necessary to stabilize magnetic textures. Additionally, the use of substrates with various crystal orientations alters the magnetic anisotropy, which shifts the temperatures and strength of the SH-THE.