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

Wysocki, Alex L.; Valmispild, V. N.; Kutepov, A.; Sharma, S.; Dewhurst, J. K.; Gross, E. K. U.; Lichtenstein, A. I.; Antropov, V. P.

doi:10.1103/PhysRevB.96.184418

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

Journal Article · 15 November 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.96.184418 · OSTI ID:1410345

Wysocki, Alex L. ^[1]; Valmispild, V. N. ^[2]; Kutepov, A. ^[3]; Sharma, S. ^[4]; Dewhurst, J. K. ^[4]; Gross, E. K. U. ^[4]; Lichtenstein, A. I. ^[2]; Antropov, V. P. ^[1]

Ames Lab., Ames, IA (United States)
Univ. of Hamburg, Hamburg (Germany); The Hamburg Centre for Ultrafast Imaging, Hamburg (Germany)
Ames Lab., Ames, IA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Max Planck Institute of Microstructure Physics, Halle (Germany)

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. Furthermore, 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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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1410345

Alternate ID(s):: OSTI ID: 1408933

Report Number(s):: IS-J-9506; PRBMDO

Journal Information:: Physical Review B, Vol. 96, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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