Abstract
Magneto-optical, compositional, and magnetic properties of Biz(LuSmPb)3−zFe5O12 (z=0.05–0.9) grown epitaxially on Nd3Ga5O12 substrates from melts with different PbO/Bi2O3 ratios were studied. Chemical analysis by an x-ray microanalyzer indicates that Bi is incorporated into these films primarily by replacing Sm. Room-temperature Faraday rotation θF was measured at a wavelength of 633 nm. θF is proportional to Bi concentration z in the film and is −2×104 deg/cm for z=1.0. θF of Ga-substituted films for a Ga concentration of 0.6 was about 20% smaller than that of the unsubstituted film. The magnetic uniaxial anisotropy field Hk measured by a vibrating sample magnetometer ranged from 2500 to 5400 Oe. From the analysis of Hk data, it was found that Pb-Lu and Bi-Lu pairs were major contributors to Hk of the present garnet films.
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