Structural Defects and Ferromagnetic Signature of V-Doped Sb₂Te₃Thin Films Grown on SrTiO₃(001) Produced by RF-Magnetron Sputtering

Sato, Kazuhisa

ACS Omega, 2022, 7(44), 40480-40484

Number of Access:256（2025-07-09 13:03 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/97370

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Title
Structural Defects and Ferromagnetic Signature of V-Doped Sb₂Te₃Thin Films Grown on SrTiO₃(001) Produced by RF-Magnetron Sputtering
Creator
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
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Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
Description
Sato K., . Structural Defects and Ferromagnetic Signature of V-Doped Sb₂Te₃Thin Films Grown on SrTiO₃(001) Produced by RF-Magnetron Sputtering. ACS Omega 7, 40480 (2022); https://doi.org/10.1021/acsomega.2c05634.
Abstract
Thin films of V-doped Sb₂Te₃compounds were fabricated by co-deposition of Sb₂Te₃and V using rf-magnetron sputtering onto SrTiO₃(001) substrates kept at 570 K. The microstructures of the films were characterized using transmission electron microscopy (TEM) and electron diffraction. The crystal structure of the sputtered film (Sb₃₈V₂Te₆₀) is the Bi₂Te₃-type structure with lattice parameters of a = 0.44 ± 0.03 nm and c = 3.02 ± 0.02 nm. A combination of cross-sectional and plan-view TEM observations revealed the preferential orientation of the c axis in the film's normal direction. A thin amorphous layer exists between the Sb₂Te₃thin film and the SrTiO₃substrate. The interfacial amorphous layer relaxes the strain between the thin film and the substrate, and hence, it should promote the growth of a low-index atomic plane with a low surface free energy (i.e., (0001) of the Sb₂Te₃). The onset of ferromagnetic order was detected at temperatures below 70 K. A remarkable increase in magnetization was detected in the film's normal direction, which corresponds to the magnetic easy axis (i.e., c axis of the Sb₂Te₃). V³⁺ions substituting Sb sites should contribute to ferromagnetism at low temperatures.
Publisher
American Chemical Society
Source Title
ACS Omega
Volume (Issue)
7(44)
Page
40480-40484
Date of Issued
2022-10-31
Language
English
Handle URL
https://hdl.handle.net/11094/97370
eISSN
24701343
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DOI (Publisher Version)
https://doi.org/10.1021/acsomega.2c05634
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open access
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This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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学術雑誌論文 Journal Article