Phys. Rev. Lett. 84, 1435 - 1438 (2000)New Effects in Light Scattering in Disordered Media and Coherent Backscattering Cone: Systems of Magnetic Particles |
F. A. Pinheiro1 *, 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
Received 8 October 1999
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 kℓ*, which exhibits an oscillatory dependence on the scatterer magnetic permeability. By considering magnetic scatterers following a Curie-Weiss susceptibility law, we suggest that kℓ* can be tuned by varying the temperature.
©2000 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v84/p1435
DOI: 10.1103/PhysRevLett.84.1435
PACS: 42.25.Dd
* Author to whom correspondence should be addressed. Electronic address: felipe@cbpf.br
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