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Observation of strong bulk spin-orbit torques in the van der Waals ferromagnet Fe₃GeTe₂
Franziska Martin,Kyujoon Lee,Maurice Schmitt,Anna Liedtke,Aga Shahee,Haakon Thømt Simensen,Tanja Scholz,Tom G. Saunderson,Dongwook Go,Martin Gradhand,Yuriy Mokrousov,Thibaud Denneulin,Andras Kovacs,Be 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The recent emergence of magnetic van der Waals materials allows for the investigation of current induced magnetization manipulation in two dimensional materials. Uniquely, Fe<sub>3</sub>GeTe<sub>2</sub> has a crystalline structure that allows for the presence of bulk spin-orbit torques (SOTs), that we quantify in a Fe<sub>3</sub>GeTe<sub>2</sub> flake. From the symmetry of the measured torques, we identify the current induced effective fields using harmonic analysis and find dominant bulk SOTs, which arise from the symmetry in the crystal structure. Our results show that Fe<sub>3</sub>GeTe<sub>2</sub> uniquely can exhibit bulk SOTs in addition to the conventional interfacial SOTs enabling magnetization modification even in thick single layers without the need for complex multilayer engineering.