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Title:
Spin-density fluctuations and the fluctuation-dissipation theorem in $3d$ ferromagnetic metals
Affiliation(s):
XFEL.EU staff, Other
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Abstract:
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.
Imprint:
American Physical Society, 2017
Journal Information:
Physical Review B, 96 (18), 184418 (2017)
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Language(s):
English


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 Record created 2018-07-11, last modified 2018-07-19

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