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An experimental study is presented to determine the CrSBr magnetic exchange Hamiltonian and bulk magnon spectrum. The <jats:italic>A<\/jats:italic>\u2010type 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\u2010plane ferromagnetic Heisenberg exchange model with seven nearest in\u2010plane 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\u2010orbit enhanced CrSBr\u00a0heterostructure.<\/jats:p>","DOI":"10.1002\/advs.202202467","type":"journal-article","created":{"date-parts":[[2022,7,7]],"date-time":"2022-07-07T19:36:01Z","timestamp":1657222561000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":91,"title":["Spin Waves and Magnetic Exchange Hamiltonian in CrSBr"],"prefix":"10.1002","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7450-5138","authenticated-orcid":false,"given":"Allen","family":"Scheie","sequence":"first","affiliation":[{"name":"Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Ziebel","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University New York NY 10027 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel G.","family":"Chica","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University New York NY 10027 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Youn June","family":"Bae","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University New York NY 10027 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoping","family":"Wang","sequence":"additional","affiliation":[{"name":"Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander I.","family":"Kolesnikov","sequence":"additional","affiliation":[{"name":"Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoyang","family":"Zhu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University New York NY 10027 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xavier","family":"Roy","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University New York NY 10027 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,7,7]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature22391"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature22060"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-018-0631-z"},{"key":"e_1_2_9_4_1","first-page":"041028","volume":"8","author":"Chen L.","year":"2018","journal-title":"Phys. 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