Enhanced Coercivity in Spin-Orbit-Proximitized Cr<sub>3</sub>Te<sub>4</sub> Ultrathin Films.
basic_science · Level V
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- Record sourced from PubMed, PMID 42434986.
- Also identified by DOI 10.1021/acs.nanolett.6c01518.
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Abstract
Two-dimensional (2D) van der Waals (vdW) ferromagnets for spintronic applications require both a high enough Curie temperature (<i>T</i><sub>C</sub>) and large coercivity. However, while high-<i>T</i><sub>C</sub> systems have been intensively explored, achieving robust coercivity remains poorly demonstrated. Here we address this limitation through interfacial spin-orbit proximity effects. We develop vdW heterostructures consisting of an Ising ferromagnet Cr<sub>3</sub>Te<sub>4</sub> and metallic transition-metal dichalcogenides (TMDCs) with broken in-plane inversion symmetry, including TaSe<sub>2</sub> and NbSe<sub>2</sub>, and observe a large enhancement of the coercivity of Cr<sub>3</sub>Te<sub>4</sub> without <i>T</i><sub>C</sub> degrading. A comparison between TaSe<sub>2</sub> and NbSe<sub>2</sub> shows a systematic correlation between coercivity enhancement and Zeeman-type spin-orbit interaction (SOI) in the TMDC layer. Furthermore, ion-gating experiments support the continuous tuning of magnetic anisotropy in ultrathin Cr<sub>3</sub>Te<sub>4</sub> with enhanced coercivity. These results suggest that interfacial spin-orbit proximity effects associated with Zeeman SOI provide an effective route for reinforcing magnetic anisotropy in 2D Cr<sub>3</sub>Te<sub>4</sub>, providing a design principle for gate-tunable 2D spintronic devices.