Abstract

Magnetically induced extinction and birefringence of systems containing a mixture of ultramicroscopic particles with different optical and magnetic properties have been theoretically investigated. It is shown that the effects may exhibit an extremum and an inversion in sign with increasing applied field strength if the system contains diamagnetic as well as ferromagnetic particles. The field strengths at which the effects exhibit the extremum and the inversion in sign are found to depend on the relative number distribution of the two types of particles and on the wavelength of the incident radiation. Experimental results from systems containing particles of bentonite and chromium ferrite in different proportions are also discussed.

© 1980 Optical Society of America

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