論文 Direct evidence of induced magnetic moment in Se and the role of misplaced Mn in MnBi 2 Se 4 -based intrinsic magnetic topological insulator heterostructures

R. Fukushima ; V. N. Antonov ; M. M. Otrokov ; T. T. Sasaki SAMURAI ORCID (National Institute for Materials Science) ; R. Akiyama ; K. Sumida ; K. Ishihara ; S. Ichinokura ; K. Tanaka ; Y. Takeda ; D. P. Salinas ; S. V. Eremeev ; E. V. Chulkov ; A. Ernst ; T. Hirahara

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R. Fukushima, V. N. Antonov, M. M. Otrokov, T. T. Sasaki, R. Akiyama, K. Sumida, K. Ishihara, S. Ichinokura, K. Tanaka, Y. Takeda, D. P. Salinas, S. V. Eremeev, E. V. Chulkov, A. Ernst, T. Hirahara. Direct evidence of induced magnetic moment in Se and the role of misplaced Mn in MnBi 2 Se 4 -based intrinsic magnetic topological insulator heterostructures. Physical Review Materials. 2024, 8 (), 084202. https://doi.org/10.1103/physrevmaterials.8.084202
SAMURAI

説明:

(abstract)

Intrinsic magnetic topological insulators, in which magnetism and topology are inherently combined, are excellent systems to realize exotic phenomena such as the quantum anomalous Hall effect. However, there are many reports that show that the experimental samples are not so ideal and the effect of the unintentional disorder in these systems needs to be considered carefully. In this study, we investigate the role of misplaced magnetic atoms as well as nonmagnetic elements in the intrinsic magnetic topological insulator heterostructures based on MnBi2Se4 and Bi2Se3. We find that Mn atoms are not only placed at the central layer of the MnBi2Se4 septuple layer (SL) but also intermix with Bi (antisite Mn) as well as reside in the van der Waals (vdW) gap. Through a detailed comparison between the experimental and theoretical x-ray magnetic circular dichroism (XMCD) spectra, we find that the antisite Mn is coupled ferromagnetically, whereas the vdW Mn couple antiferromagnetically to the Mn in the central atomic plane of the SL. Furthermore, we detect a clear XMCD signal in nonmagnetic Se, providing unambiguous evidence of its magnetic interaction with Mn.

権利情報:

キーワード: Magnetic topological insulator, MnBi2Se

刊行年月日: 2024-08-15

出版者: American Physical Society (APS)

掲載誌:

  • Physical Review Materials (ISSN: 24759953) vol. 8 084202

研究助成金:

  • Japan Society for the Promotion of Science 22H00293
  • Murata Science Foundation H30-084
  • Asahi Glass Foundation
  • Iketani Science and Technology Foundation 0321083-A
  • Ministry of Education, Culture, Sports, Science and Technology JPMXP09A20AE0016 (Nanotechnology Platform project)
  • Japan Society for the Promotion of Science 18H03877
  • 2022-138210NB-I00 (MCIN/ AEI /10.13039/ 501100011033)
  • Ayuda CEX2023-001286-S (ERDF A way of making Europe)
  • Government of Aragon (European Union NextGenerationEU (PRTR-C17.I1))
  • Ministry of Education, Culture, Sports, Science and Technology JPMXP09A21AE0017 (Nanotechnology Platform project)
  • Ministry of Education, Culture, Sports, Science and Technology JPMXP09A21AE0036 (Nanotechnology Platform project)

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5237

公開URL: https://doi.org/10.1103/physrevmaterials.8.084202

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更新時刻: 2025-01-06 16:30:26 +0900

MDRでの公開時刻: 2025-01-06 16:30:27 +0900

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