Enhanced Magnetic Anisotropy and Curie Temperature by the Absence of Se Atoms at the Interface of EuS/Bi2Se3. Issue 4 (10th January 2023)

• Record Type: Journal Article
• Authors: Yang, Wenchao; Yang, Ke; Li, Zhongyao
• Is Part Of: Physica status solidi. Volume 17:Issue 4(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-10
• Subjects: density functional theory calculations -- ferromagnetic insulators -- interfaces -- magnetic anisotropy -- topological insulators; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202200442
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : The heterojunction composed of ferromagnetic insulator (EuS) and topological insulator (Bi2 Se3 ) is interesting due to several unusual behaviors produced by the interfacial effects. Previous experiments suggest a largely enhanced Curie temperature up to room temperature and perpendicular magnetic anisotropy at the interface [F. Katmis et al., Nature 533, 513 (2016).]. However, a recent experiment indicates that room‐temperature ferromagnetic behavior is absent, and only in‐plane anisotropy is observed [A.I. Figueroa et al., PRL 125, 226 801 (2020).]. To understand the puzzling observations in EuS/Bi2 Se3, Se‐missing interfacial system is constructed and the magnetic anisotropy energy and the Curie temperature based on density functional calculations are studied. The results suggest that the absence of Se atoms greatly enhance the perpendicular magnetic anisotropy and the estimated Curie temperature based on Ising model can be up to room temperature. Therefore, the puzzling observations may be concerned with the details of the interfacial system. Abstract : The absence of Se atoms at the interface greatly enhance the perpendicular magnetic anisotropy, and the estimated Curie temperature based on Ising model can be up to room temperature. The calculations may be useful for understanding the puzzling observations in EuS/Bi2 Se3 .