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Direct Observation of Fe-Ge Ordering in Fe5-xGeTe2 Crystals and Resultant Helimagnetism

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Abstract
Microscopic structures and magnetic properties are investigated for Fe5-xGeTe2 single crystal, recently discovered as a promising van der Waals (vdW) ferromagnet. An Fe atom (Fe(1)) located in the outermost Fe5Ge sublayer has two possible split-sites which are either above or below the Ge atom. Scanning tunneling microscopy shows root 3 x root 3 superstructures which are attributed to the ordering of Fe(1) layer. The root 3 x root 3 superstructures have two different phases due to the symmetry of Fe(1) ordering. Intriguingly, the observed root 3 x root 3 ordering breaks the inversion symmetry of crystal, resulting in substantial antisymmetric exchange interaction. The temperature dependence of magnetization reveals a sharp magnetic anomaly suggesting helical magnetism of the Fe5-xGeTe2 due to its non-centrosymmetricity. Analytical study also supports that the observed ordering can give rise to the helimagnetism. The work will provide essential information to understand the complex magnetic properties and the origin of the new vdW ferromagnet, Fe5-xGeTe2 for future topology-based spin devices.
Author(s)
찐 티 리Jungmin ParkKyoo KimHyo-Bin Ahn이년종김광수Tae-Eon Park둡질간바트웬 후 람Kyuha JangChun-Yeol YouYounghun JoSe Kwon KimChanggu Lee김상훈김정대
Issued Date
2021
Type
Article
Keyword
2D materialsFe 5GeTe 2FerromagnetismHelimagnetismMagnetic propertiesMagnetizationnon‐centrosymmetricityscanning tunneling microscopy
DOI
10.1002/adfm.202009758
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9498
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A659311464&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Direct%20Observation%20of%20Fe-Ge%20Ordering%20in%20Fe5-xGeTe2%20Crystals%20and%20Resultant%20Helimagnetism&offset=0&pcAvailability=true
Publisher
ADVANCED FUNCTIONAL MATERIALS
Location
독일
Language
영어
ISSN
1616-301X
Citation Volume
31
Citation Number
17
Citation Start Page
200975
Citation End Page
200975
Appears in Collections:
Natural Science > Physics
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