Spin-density fluctuations and the fluctuation-dissipation theorem in ferromagnetic metals
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. 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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1410345
- Alternate Identifier(s):
- OSTI ID: 1408933
- Report Number(s):
- IS-J-9506
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 18; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Wysocki, Alex L., Valmispild, V. N., Kutepov, A., Sharma, S., Dewhurst, J. K., Gross, E. K. U., Lichtenstein, A. I., and Antropov, V. P.. Spin-density fluctuations and the fluctuation-dissipation theorem in 3d ferromagnetic metals. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.96.184418.
Wysocki, Alex L., Valmispild, V. N., Kutepov, A., Sharma, S., Dewhurst, J. K., Gross, E. K. U., Lichtenstein, A. I., & Antropov, V. P.. Spin-density fluctuations and the fluctuation-dissipation theorem in 3d ferromagnetic metals. United States. https://doi.org/10.1103/PhysRevB.96.184418
Wysocki, Alex L., Valmispild, V. N., Kutepov, A., Sharma, S., Dewhurst, J. K., Gross, E. K. U., Lichtenstein, A. I., and Antropov, V. P.. Wed .
"Spin-density fluctuations and the fluctuation-dissipation theorem in 3d ferromagnetic metals". United States. https://doi.org/10.1103/PhysRevB.96.184418. https://www.osti.gov/servlets/purl/1410345.
@article{osti_1410345,
title = {Spin-density fluctuations and the fluctuation-dissipation theorem in 3d ferromagnetic metals},
author = {Wysocki, Alex L. and Valmispild, V. N. and Kutepov, A. and Sharma, S. and Dewhurst, J. K. and Gross, E. K. U. and Lichtenstein, A. I. and Antropov, V. P.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.96.184418},
journal = {Physical Review B},
number = 18,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}
Web of Science
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