Park, Tae-Eon Peng, Licong Liang, Jinghua Hallal, Ali Yasin, Fehmi Sami Zhang, Xichao Song, Kyung Mee Kim, Sung Jong Kim, Kwangsu Weigand, Markus Schutz, Gisela Finizio, Simone Raabe, Jorg Garcia, Karin Xia, Jing Zhou, Yan Ezawa, Motohiko Liu, Xiaoxi Chang, Joonyeon Koo, Hyun Cheol Kim, Young Duck Chshiev, Mairbek Fert, Albert Yang, Hongxin Yu, Xiuzhen Woo, Seonghoon 2024-01-19T15:04:21Z 2024-01-19T15:04:21Z 2021-09-05 2021-03-05 2469-9950 https://pubs.kist.re.kr/handle/201004/117270 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 Neel-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. English AMER PHYSICAL SOC INITIO MOLECULAR-DYNAMICS TOTAL-ENERGY CALCULATIONS SPIN-ORBIT TORQUES CRYSTAL TRANSITION Neel-type skyrmions and their current-induced motion in van derWaals ferromagnet-based heterostructures Article 10.1103/PhysRevB.103.104410 1 Physical Review B, v.103, no.10 Physical Review B 103 10 scie scopus 000627551900002 2-s2.0-85102893721 Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Materials Science Physics Article INITIO MOLECULAR-DYNAMICS TOTAL-ENERGY CALCULATIONS SPIN-ORBIT TORQUES CRYSTAL TRANSITION