New Effects in Light Scattering in Disordered Media and Coherent Backscattering Cone: Systems of Magnetic Particles

F. A. Pinheiro; A. S. Martinez; L. C. Sampaio

doi:10.1103/PhysRevLett.84.1435

New Effects in Light Scattering in Disordered Media and Coherent Backscattering Cone: Systems of Magnetic Particles

F. A. Pinheiro, A. S. Martinez, and L. C. Sampaio

Phys. Rev. Lett. 84, 1435 – Published 14 February 2000

Abstract

Single and multiple scattering of light by magnetic particles and their implications to the coherent backscattering effect are reported. Single scattering of light by small magnetic particles presents unusual features such as forward-backward asymmetry and resonance effects. In multiple scattering, this leads to a global decrease in the localization parameter $k ℓ^{*}$ , which exhibits an oscillatory dependence on the scatterer magnetic permeability. By considering magnetic scatterers following a Curie-Weiss susceptibility law, we suggest that $k ℓ^{*}$ can be tuned by varying the temperature.

Received 8 October 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.1435

Authors & Affiliations

F. A. Pinheiro^1,*, A. S. Martinez², and L. C. Sampaio¹

¹Centro Brasileiro de Pesquisas Físicas/CNPq, Rua Dr. Xavier Sigaud, 150, Urca, CEP 22290-180, Rio de Janeiro, Rio de Janeiro, Brazil
²Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, CEP 14040-901, Ribeirão Preto, São Paulo, Brazil