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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 30 — Oct. 20, 2011
  • pp: 5780–5787

Oscillatory-like relaxation behavior of light transmitted through ferrofluids

Jian Li, Xiaoyan Qiu, Yueqiang Lin, Xiaodong Liu, Jun Fu, Hua Miao, Qingmei Zhang, and Tingzhen Zhang  »View Author Affiliations


Applied Optics, Vol. 50, Issue 30, pp. 5780-5787 (2011)
http://dx.doi.org/10.1364/AO.50.005780


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Abstract

An oscillatory-like relaxation process in which there are two valleys in the T - t curve is observed when light is transmitted through binary ferrofluids composed of both ferrimagnetic CoFe 2 O 4 nanoparticles and paramagnetic p - MgFe 2 O 4 nanoparticles in the presence of a high magnetic field and through pure (single) CoFe 2 O 4 ferrofluids in a low magnetic field. This relaxation behavior is explained using a model of a bidispersed system based on both chained and unchained particles. In such a bidispersed system, the variation of the transmitted light results mainly from the motion of the chains, with the polarized unchained particles’ gas producing the modulation effect. The oscillatory-like relaxation phenomenon depends on the features of both the chained and unchained particle systems. If either the particle volume fraction of chained particles or of unchained particles is very low, or the degree of polarization of the unchained particles gas is very weak, a simple nonlinear relaxation process, giving only a valley in the T - t curve, will appear for the transmitted light. For pure CoFe 2 O 4 ferrofluids, the number of chained and unchained particles does not remain constant under different values of the magnetic field. According to the analysis of the relaxation behavior of transmitted light, it is known that binary ferrofluids based on strong magnetic CoFe 2 O 4 particles and weak magnetic p - MgFe 2 O 4 particles can be much closer to the theoretical bidispersed system than single ferrofluids containing only strong magnetic particles.

© 2011 Optical Society of America

OCIS Codes
(160.3820) Materials : Magneto-optical materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter

ToC Category:
Materials

History
Original Manuscript: May 20, 2011
Revised Manuscript: July 17, 2011
Manuscript Accepted: July 18, 2011
Published: October 11, 2011

Citation
Jian Li, Xiaoyan Qiu, Yueqiang Lin, Xiaodong Liu, Jun Fu, Hua Miao, Qingmei Zhang, and Tingzhen Zhang, "Oscillatory-like relaxation behavior of light transmitted through ferrofluids," Appl. Opt. 50, 5780-5787 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-30-5780


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