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Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in noncollinear magnetic dimers
KTH, School of Engineering Sciences (SCI), Applied Physics. Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil.
Faculdade de Física, Universidade Federal do Pará, 66075-110 Belém, PA, Brazil; Instituto Federal de Educação, Ciência e Tecnologia do Pará, 68250-000 Óbidos, PA, Brazil.
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
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2023 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 108, no 22, article id 224408Article in journal (Refereed) Published
Abstract [en]

A spin Hamiltonian that characterizes interatomic interactions between spin moments is highly valuable in predicting and comprehending the magnetic properties of materials. Here, we explore a method for explicitly calculating interatomic exchange interactions in noncollinear configurations of magnetic materials considering only a bilinear spin Hamiltonian in a local scenario. Based on density-functional theory calculations of dimers adsorbed on metallic surfaces, and with a focus on the Dzyaloshinskii-Moriya interaction (DMI) which is essential for stabilizing chiral noncollinear magnetic states, we discuss the interpretation of the DMI when decomposed into microscopic electron and spin densities and currents. We clarify the distinct origins of spin currents induced in the system and their connection to the DMI. In addition, we reveal how noncollinearity affects the usual DMI, which is solely induced by spin-orbit coupling, and DMI-like interactions brought about by noncollinearity. We explain how the dependence of the DMI on the magnetic configuration establishes a connection between high-order magnetic interactions, enabling the transition from a local to a global spin Hamiltonian.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2023. Vol. 108, no 22, article id 224408
National Category
Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-341598DOI: 10.1103/PhysRevB.108.224408ISI: 001141676300006Scopus ID: 2-s2.0-85179475159OAI: oai:DiVA.org:kth-341598DiVA, id: diva2:1822629
Note

QC 20231227

Available from: 2023-12-27 Created: 2023-12-27 Last updated: 2024-02-29Bibliographically approved

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Delin, Anna

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