Dielectric tunability of magnetic properties in orthorhombic ferromagnetic monolayer CrSBr

Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature of around 146 K. In contrast to many other known 2D magnets, the orthorhombic lattice of CrSBr gives rise to spatial anisotropy of magnetic excitations within the 2D plane. Triaxial magnetic anisotr...

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Bibliographic Details
Published in:npj computational materials 2023-05, Vol.9 (1), p.83-10, Article 83
Main Authors: Rudenko, Alexander N., Rösner, Malte, Katsnelson, Mikhail I.
Format: Article
Language:English
Subjects:
639/166/987
639/301/1034/1037
639/301/119/997
639/925/357/1018
Anisotropy
Characterization and Evaluation of Materials
Chemistry and Materials Science
Computational Intelligence
Crystal structure
Curie temperature
Electrons
Ferromagnetism
First principles
Green's functions
Magnetic anisotropy
Magnetic properties
Magnets
Materials Science
Mathematical and Computational Engineering
Mathematical and Computational Physics
Mathematical Modeling and Industrial Mathematics
Monolayers
Orthorhombic lattice
Screening
Substrates
Symmetry
Theoretical
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Summary:Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature of around 146 K. In contrast to many other known 2D magnets, the orthorhombic lattice of CrSBr gives rise to spatial anisotropy of magnetic excitations within the 2D plane. Triaxial magnetic anisotropy and considerable magnetic dipolar interactions in CrSBr challenge its theoretical description in terms of spin Hamiltonians. Here, we employ a Green’s function formalism combined with first-principles calculations to study the magnetic properties of monolayer CrSBr in different regimes of surrounding dielectric screening. In the free-standing limit, the system is close to an easy-plane magnet, whose long-range ordering is partially suppressed. On the contrary, in the regime of large external screening, monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic ordering. Our findings suggest that anisotropic layered magnets form a potentially promising platform for studying the effects of substrate screening on magnetic ordering in 2D.
ISSN:2057-3960
2057-3960
DOI:10.1038/s41524-023-01050-3