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Spin-density fluctuations and the fluctuation-dissipation theorem in 3d ferromagnetic metals

TitleSpin-density fluctuations and the fluctuation-dissipation theorem in 3d ferromagnetic metals
Publication TypeJournal Article
Year of Publication2017
AuthorsWysocki, AL, Valmispild, VN, Kutepov, A, Sharma, S, Dewhurst, JK, Gross, EKU, Lichtenstein, AI, Antropov, VP
JournalPhysical Review B
Date Published11
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000415168400007
Keywordsdynamics, electronic-structure, linear-response, physics, susceptibility, transition-metals

Spatial and time scales of spin-density fluctuations (SDFs) were analyzed in 3d ferromagnets using ab initio linear-response calculations of complete wave-vector and energy dependence of the dynamic spin susceptibility tensor. We demonstrate that SDFs are spread continuously over the entire Brillouin zone and while the majority of them reside within the 3d bandwidth, a significant amount comes from much higher energies. A validity of the adiabatic approximation in spin dynamics is discussed. The SDF spectrum is shown to have two main constituents: a minor low-energy spin-wave contribution and a much larger high-energy component from more localized excitations. Using the fluctuation-dissipation theorem, the on-site spin correlator and the related effective fluctuating moment were properly evaluated and their universal dependence on the 3d band population is further discussed.

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Exploratory Theory