Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2
- Other Titles
- Surface oxidation in a van der Waals ferromagnet Fe3-xGeTe2
- Authors
- 김동섭; 기정연; 이지은; Liu Yu; 김영학; 김남동; 황춘규; 김원동; Petrovic Cedomir; 이동렬; Jang Chaun; 류혜진; 최준우
- Issue Date
- Oct-2021
- Publisher
- 한국물리학회
- Keywords
- Van der Waals ferromagnet Fe3GeTe2 Surface oxidation X-ray absorption spectroscopy X-ray magnetic circular dichroism
- Citation
- Current Applied Physics, v.30, pp.40 - 45
- Journal Title
- Current Applied Physics
- Volume
- 30
- Start Page
- 40
- End Page
- 45
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/41461
- DOI
- 10.1016/j.cap.2021.04.022
- ISSN
- 1567-1739
- 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.
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