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Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in noncollinear magnetic dimers
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- Cardias, Ramon (author)
- KTH,Tillämpad fysik,Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil,AlbaNova Univ Ctr, KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, SE-10691 Stockholm, Sweden.;Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ, Brazil.
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- Silva, Jhonatan dos Santos (author)
- 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,Univ Fed Para, Fac Fis, Belem, PA, Brazil.;Inst Fed Educ Ciencia & Tecnol Para, Obidos, PA, Brazil.
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- Bergman, Anders, 1978- (author)
- Uppsala universitet,Materialteori
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- American Physical Society (APS), 2023
- 2023
- English.
- In: Physical Review B. - : American Physical Society (APS). - 2469-9950 .- 2469-9969. ; 108:22
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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