Phonon-magnon interactions in body centered cubic iron: A combined molecular and spin dynamics study

Combining an atomistic many-body potential with a classical spin Hamiltonian parameterized by first principles calculations, molecular-spin dynamics computer simulations were performed to investigate phonon-magnon interactions in body centered cubic iron. Results obtained for spin-spin and density-d...

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Bibliographic Details
Published in:Journal of applied physics 2014-05, Vol.115 (17)
Main Authors: Perera, Dilina, Landau, David P., Nicholson, Don M., Malcolm Stocks, G., Eisenbach, Markus, Yin, Junqi, Brown, Gregory
Format: Article
Language:English
Subjects:
Computer simulation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Coupling (molecular)
Damping
defects
Density
First principles
Iron
Lattice vibration
Magnons
materials and chemistry by design
MATERIALS SCIENCE
mechanical behavior
nuclear (including radiation effects)
Spin dynamics
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Summary:Combining an atomistic many-body potential with a classical spin Hamiltonian parameterized by first principles calculations, molecular-spin dynamics computer simulations were performed to investigate phonon-magnon interactions in body centered cubic iron. Results obtained for spin-spin and density-density dynamic structure factors show that noticeable softening and damping of magnon modes occur due to the presence of lattice vibrations. Furthermore, as a result of the phonon-magnon coupling, additional longitudinal spin wave excitations are observed, with the same frequencies as the longitudinal phonon modes.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4863488