Controllable Skyrmionic Phase Transition between Néel Skyrmions and Bloch Skyrmionic Bubbles in van der Waals Ferromagnet Fe3-δGeTe2

Liu, Chen; Jiang, Jiawei; Zhang, Chenhui; Wang, Qingping; Zhang, Huai; Zheng, Dongxing; Li, Yan; Ma, Yinchang; Algaidi, Hanin; Gao, Xingsen; Hou, Zhipeng; Mi, Wenbo; Liu, Jun‐ming; Qiu, Ziqiang; Zhang, Xixiang

doi:10.1002/advs.202303443

Title: Controllable Skyrmionic Phase Transition between Néel Skyrmions and Bloch Skyrmionic Bubbles in van der Waals Ferromagnet Fe_3-δGeTe₂

Journal Article · 28 July 2023 · Advanced Science

DOI: https://doi.org/10.1002/advs.202303443 · OSTI ID:2422582

^[1]; Jiang, Jiawei ^[2];

^[1]; Wang, Qingping ^[3]; Zhang, Huai ^[4]; Zheng, Dongxing ^[1]; Li, Yan ^[1]; Ma, Yinchang ^[1]; Algaidi, Hanin ^[1]; Gao, Xingsen ^[4]; Hou, Zhipeng ^[4]; Mi, Wenbo ^[2]; Liu, Jun‐ming ^[5]; Qiu, Ziqiang ^[6];

^[1]

King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
Tianjin Univ. (China)
Aba Teachers University (China); South China Normal University (SCNU), Guangzhou (China)
South China Normal University (SCNU), Guangzhou (China)
South China Normal University (SCNU), Guangzhou (China); Nanjing Univ. (China)
University of California, Berkeley, CA (United States)

The van der Waals (vdW) ferromagnet Fe_3-δGeTe₂ has garnered significant research interest as a platform for skyrmionic spin configurations, that is, skyrmions and skyrmionic bubbles. However, despite extensive efforts, the origin of the Dzyaloshinskii–Moriya interaction (DMI) in Fe_3-δGeTe₂ remains elusive, making it challenging to acquire these skyrmionic phases in a controlled manner. In this study, it is demonstrated that the Fe content in Fe_3-δGeTe₂ has a profound effect on the crystal structure, DMI, and skyrmionic phase. For the first time, a marked increase in Fe atom displacement with decreasing Fe content is observed, transforming the original centrosymmetric crystal structure into a non-centrosymmetric symmetry, leading to a considerable DMI. Additionally, by varying the Fe content and sample thickness, a controllable transition between Néel-type skyrmions and Bloch-type skyrmionic bubbles is achieved, governed by a delicate interplay between dipole–dipole interaction and the DMI. The findings offer novel insights into the variable skyrmionic phases in Fe_3-δGeTe₂ and provide the impetus for developing vdW ferromagnet-based spintronic devices.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2422582

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 27 Vol. 10; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Dzyaloshinskii-Moriya interaction
Fe atom displacement
magnetic skyrmions

Title: Controllable Skyrmionic Phase Transition between Néel Skyrmions and Bloch Skyrmionic Bubbles in van der Waals Ferromagnet Fe3-δGeTe2

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References (55)

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Title: Controllable Skyrmionic Phase Transition between Néel Skyrmions and Bloch Skyrmionic Bubbles in van der Waals Ferromagnet Fe_3-δGeTe₂