Thery of light scattering in disordered magnetic systems

A. F. Khater, M. A. Continentino

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A theory is presented for light scattering in disordered magnetic systems using a scattering Hamiltonian for which the incident radiation is transformed from the laboratory frame to the local frames on the spins, and the scattered radiation back. The light-scattering cross sections involves a sum over all the wavevectors, as well as a sum over all the configurational averages of the dynamic susceptibilities of the different magnetic modes of the spin system of the material. All wavevectors contribute as a consequence of the breakdown of wavevector selection rules due to the lack of translational invariance in these systems. The sum over all the dynamic susceptibilities is a consequence of the incident light coupling to all the modes via a magnetic structure factor, since the spins are oriented at random in a disordered magnetic system. The site disorder which gives different scattering strengths per site is treated kinematically by a mapping procedure previously used for the n-sublattice ferrimagnet, n being arbitrarily large. The theory is applied to light scattering in amorphous ferromagnets and spin glasses. It is found that scattering occurs from transverse and longitudinal excitation in amorphous ferromagnets, and from diffusion excitations in spin glasses.

Original languageEnglish
Article number024
Pages (from-to)2993-3003
Number of pages11
JournalJournal of Physics C: Solid State Physics
Volume15
Issue number13
DOIs
Publication statusPublished - 1982
Externally publishedYes

Fingerprint

Light scattering
Magnets
light scattering
Spin glass
Scattering
Light
spin glass
scattering
Glass
magnetic permeability
Radiation
Hamiltonians
ferrimagnets
incident radiation
Magnetic structure
Invariance
scattering cross sections
sublattices
excitation
invariance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Thery of light scattering in disordered magnetic systems. / Khater, A. F.; Continentino, M. A.

In: Journal of Physics C: Solid State Physics, Vol. 15, No. 13, 024, 1982, p. 2993-3003.

Research output: Contribution to journalArticle

Khater, A. F. ; Continentino, M. A. / Thery of light scattering in disordered magnetic systems. In: Journal of Physics C: Solid State Physics. 1982 ; Vol. 15, No. 13. pp. 2993-3003.
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