Neel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures
- Neel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures
- 장준연; 구현철; 박태언; 송경미; 김성종; 김광수; Licong Peng; Jinghua Liang; Ali Hallal; Fehmi Sami Yasin; Xichao Zhang; Markus Weigand; Gisela Schutz; Simone Finizio; Jorg Raabe; Karin Garcia; Jing Xia; Yan Zhou; Motohiko Ezawa; Xiaoxi Liu; Young Duck Kim; Mairbek Chshiev; Albert Fert; Hongxin Yang; Xiuzhen Yu; Seonghoon Woo
- Issue Date
- Physical review B, Condensed matter and materials physics
- VOL 103, NO 10, 104410
- Since the discovery of ferromagnetic two-dimensional (2D) van der Waals (vdW) crystals, significant interest on such 2D magnets has emerged, inspired by their appealing physical properties and integration with other 2D family for unique heterostructures. In known 2D magnets, spin-orbit coupling (SOC) stabilizes perpendicular magnetic anisotropy down to one or a few monolayers. Such a strong SOC could also lift the chiral degeneracy, leading to the formation of topological magnetic textures such as skyrmions through the Dzyaloshinskii-Moriya interaction (DMI). Here, we report the experimental observation of N？el-type chiral magnetic skyrmions and their lattice (SkX) formation in a vdW ferromagnet Fe3GeTe2 (FGT). We demonstrate the ability to drive an individual skyrmion by short current pulses along a vdW heterostructure, FGT/h-BN, as highly required for any skyrmion-based spintronic device. Using first principle calculations supported by experiments, we unveil the origin of DMI being the interfaces with oxides, which then allows us to engineer vdW heterostructures for desired chiral states. Our finding opens the door to topological spin textures in the 2D vdW magnet and their potential device application.
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