Large magnetorefractive effect in magnetite

Details Large magnetorefractive effect in magnetite Large magnetorefractive effect in magnetite

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12j3023c&link_type=abstract

New Journal of Physics, Volume 12, Issue 10, pp. 103023 (2010).

Physics

1

Scientific paper

We carried out a magneto-optical spectroscopic study of magnetite (Fe3O4) thin films and single crystals at optical wavelengths. We observed a relevant quadratic magneto-optic contribution that can be notably larger than first-order linear magneto-optics at some range of wavelengths in the visible region. These unusual quadratic effects are particularly strong at the Verwey temperature (100-120 K) and decay slowly away from this transition temperature. We attribute this remarkable magneto-optical response to a magnetorefractive effect associated with the field-dependent polaronic conductivity at optical frequencies, which interestingly enough is already noticeable at room temperature.

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