Spin Waves and Magnetic Exchange Hamiltonian in CrSBr

Scheie, Allen; Ziebel, Michael; Chica, Daniel G.; Bae, Youn June; Wang, Xiaoping; Kolesnikov, Alexander I.; Zhu, Xiaoyang; Roy, Xavier

doi:10.1002/advs.202202467

Spin Waves and Magnetic Exchange Hamiltonian in CrSBr

Journal Article · Thu Jul 07 00:00:00 EDT 2022 · Advanced Science

DOI:https://doi.org/10.1002/advs.202202467· OSTI ID:1875196

^[1]; Ziebel, Michael ^[2]; Chica, Daniel G. ^[2]; Bae, Youn June ^[2]; Wang, Xiaoping ^[1]; Kolesnikov, Alexander I. ^[1]; Zhu, Xiaoyang ^[2]; Roy, Xavier ^[2]

Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
Department of Chemistry Columbia University New York NY 10027 USA

Abstract

CrSBr is an air‐stable two‐dimensional (2D) van der Waals semiconducting magnet with great technological promise, but its atomic‐scale magnetic interactions—crucial information for high‐frequency switching—are poorly understood. An experimental study is presented to determine the CrSBr magnetic exchange Hamiltonian and bulk magnon spectrum. The A ‐type antiferromagnetic order using single crystal neutron diffraction is confirmed here. The magnon dispersions are also measured using inelastic neutron scattering and rigorously fit the excitation modes to a spin wave model. The magnon spectrum is well described by an intra‐plane ferromagnetic Heisenberg exchange model with seven nearest in‐plane exchanges. This fitted exchange Hamiltonian enables theoretical predictions of CrSBr behavior: as one example, the fitted Hamiltonian is used to predict the presence of chiral magnon edge modes with a spin‐orbit enhanced CrSBr heterostructure.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0019443

OSTI ID:: 1875196

Alternate ID(s):: OSTI ID: 1885477
OSTI ID: 1888929

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 25 Vol. 9; ISSN 2198-3844

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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