Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2

Title
Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2
Authors
최준우장차운류혜진김동섭이지은기정연Yu LiuYounghak KimNamdong KimChoongyu HwangWondong KimCedomir PetrovicDong Ryeol Lee
Keywords
Surface oxidation; van der Waals ferromagnet; Fe3-xGeTe2
Issue Date
2021-05
Publisher
Current applied physics
Citation
VOL 온라인게재, 온라인게재
Abstract
We investigate the surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2, a material widely utilized for spintronic applications. While known for its relative air-insensitivity, exposure to air during the handling process (e.g. device or heterostructure fabrication) can lead to reduction or disappearance of its magnetic signal. Comparison of x-ray absorption and x-ray magnetic circular dichroism spectra between pristine and air-exposed Fe3-xGeTe2 confirm a naturally oxidized surface layer on the material. The surface oxide layer has predominantly Fe3+ content. X-ray absorption spectroscopy done on micron-sized exfoliated Fe3-xGeTe2 flakes reveal that the change in the surface chemical properties can be quite significant for thin flakes. The surface modulation of Fe3-xGeTe2 can lead to inaccuracies in characterizing its interfacial magnetic and spin transport properties, and complicate device and heterostructure fabrication processes.
URI
http://pubs.kist.re.kr/handle/201004/73370
ISSN
1567-1739
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KIST Publication > Article
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