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Magnetism and ultra...
Magnetism and ultrafast magnetization dynamics of Co and CoMn alloys at finite temperature
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- Chimata, Raghuveer (författare)
- Uppsala universitet,Materialteori
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- Delczeg-Czirjak, Erna Krisztina (författare)
- Uppsala universitet,Materialteori
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- Szilva, Attila (författare)
- Uppsala universitet,Materialteori
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- Cardias, R. (författare)
- Uppsala universitet,Materialteori,Univ Fed Para, Fac Fis, Belem, PA, Brazil
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- Kvashnin, Yaroslav (författare)
- Uppsala universitet,Materialteori
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- Pereiro, Manuel (författare)
- Uppsala universitet,Materialteori
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- Mankovsky, S. (författare)
- Department of Chemistry, University of Munich, Munich, Germany,Univ Munich, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany
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- Ebert, H. (författare)
- Department of Chemistry, University of Munich, Munich, Germany,Univ Munich, Dept Chem, Butenandtstr 5-13, D-81377 Munich, Germany
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- Thonig, Danny, 1986- (författare)
- Uppsala universitet,Materialteori
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- Sanyal, Biplab (författare)
- Uppsala universitet,Materialteori
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- Klautau, A. B. (författare)
- Faculdade de Física, Universidade Federal Do Pará, Belém, PA, Brazil,Univ Fed Para, Fac Fis, Belem, PA, Brazil
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- Eriksson, Olle, 1960- (författare)
- Uppsala universitet,Materialteori
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(creator_code:org_t)
- American Physical Society, 2017
- 2017
- Engelska.
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Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 95:21
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Temperature-dependent magnetic experiments such as pump-probe measurements generated by a pulsed laser have become a crucial technique for switching the magnetization in the picosecond time scale. Apart from having practical implications on the magnetic storage technology, the research field of ultrafast magnetization poses also fundamental physical questions. To correctly describe the time evolution of the atomic magnetic moments under the influence of a temperature-dependent laser pulse, it remains crucial to know if the magnetic material under investigation has magnetic excitation spectrum that is more or less dependent on the magnetic configuration, e.g., as reflected by the temperature dependence of the exchange interactions. In this paper, we demonstrate from first-principles theory that the magnetic excitation spectra in Co in fcc, bcc, and hcp structures are nearly identical in a wide range of noncollinear magnetic configurations. This is a curious result of a balance between the size of the magnetic moments and the strength of the Heisenberg exchange interactions, that in themselves vary with configuration, but put together in an effective spin Hamiltonian results in a configuration-independent effective model. We have used such a Hamiltonian, together with ab initio calculated damping parameters, to investigate the magnon dispersion relationship as well as ultrafast magnetization dynamics of Co and Co-rich CoMn alloys.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Chimata, Raghuve ...
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Delczeg-Czirjak, ...
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Szilva, Attila
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Cardias, R.
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Kvashnin, Yarosl ...
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Pereiro, Manuel
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Mankovsky, S.
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Ebert, H.
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Thonig, Danny, 1 ...
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Sanyal, Biplab
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Klautau, A. B.
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Eriksson, Olle, ...
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