Spin-density fluctuations and the fluctuation-dissipation theorem in ferromagnetic metals
- 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.
- 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
Web of Science
Theoretical prediction of a highly responsive material: Spin fluctuations and superconductivity in FeNiB 2 system
|
journal | October 2019 |
Spin-fluctuation and spin-relaxation effects of single adatoms from first principles
|
journal | August 2018 |
Spin dynamics from time-dependent density functional perturbation theory
|
journal | October 2018 |
Spin dynamics from time-dependent density functional perturbation theory | text | January 2018 |
Spin-fluctuation and spin-relaxation effects of single adatoms from first principles | text | January 2018 |
Theoretical prediction of a highly responsive material: Spin fluctuations and superconductivity in FeNiB2 system | text | January 2019 |
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