Creation of skyrmions in van der Waals ferromagnet Fe 3 GeTe 2 on (Co/Pd) n superlattice

Yang, M.; Li, Q.; Chopdekar, R. V.; Dhall, R.; Turner, J.; Carlström, J. D.; Ophus, C.; Klewe, C.; Shafer, P.; N’Diaye, A. T.; Choi, J. W.; Chen, G.; Wu, Y. Z.; Hwang, C.; Wang, F.; Qiu, Z. Q.

doi:10.1126/sciadv.abb5157

Creation of skyrmions in van der Waals ferromagnet Fe ₃ GeTe ₂ on (Co/Pd) _n superlattice

Journal Article · Fri Sep 04 00:00:00 EDT 2020 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abb5157· OSTI ID:1657886

^[1]; ^[1]; ^[2]; Dhall, R. ^[3]; Turner, J. ^[3]; ^[1]; ^[3]; Klewe, C. ^[2]; ^[2]; ^[2]; Choi, J. W. ^[4]; Chen, G. ^[5]; ^[6]; Hwang, C. ^[7]; ^[1]; ^[1]

Department of Physics, University of California, Berkeley, CA 94720, USA.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea.
Department of Physics, University of California, Davis, CA 95616, USA.
Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.
Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea.

Magnetic skyrmions are topological spin textures, which usually exist in noncentrosymmetric materials where the crystal inversion symmetry breaking generates the so-called Dzyaloshinskii-Moriya interaction. This requirement unfortunately excludes many important magnetic material classes, including the recently found two-dimensional van der Waals (vdW) magnetic materials, which offer unprecedented opportunities for spintronic technology. Using photoemission electron microscopy and Lorentz transmission electron microscopy, we investigated and stabilized Néel-type magnetic skyrmion in vdW ferromagnetic Fe ₃ GeTe ₂ on top of (Co/Pd) _n in which the Fe ₃ GeTe ₂ has a centrosymmetric crystal structure. We demonstrate that the magnetic coupling between the Fe ₃ GeTe ₂ and the (Co/Pd) _n could create skyrmions in Fe ₃ GeTe ₂ without the need of an external magnetic field. Our results open exciting opportunities in spintronic research and the engineering of topologically protected nanoscale features by expanding the group of skyrmion host materials to include these previously unknown vdW magnets.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); National Research Foundation of Korea; National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1657886

Alternate ID(s):: OSTI ID: 1706658

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 36 Vol. 6; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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