Open AccessTHE MAGNETO-OPTIC KERR ROTATION OF INDIUM-SUBSTITUTED SINGLE CRYSTAL BCVIG
Author(s) -
Pengxiang Zhang,
Yulong Liu,
Huanyuan Wang,
Pang Yu-Zhang
Publication year - 1982
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.31.865
Subject(s) - rotation (mathematics) , magnetization , materials science , condensed matter physics , optical rotation , curie temperature , kerr effect , physics , optics , ferromagnetism , magnetic field , geometry , mathematics , nonlinear system , quantum mechanics
We have measured the saturated polar Kerr rotation of In-substituted single crystal BCVIG, {Bi3-2xCa2x}[Fc2-yIny] (Fe(3x)Vx)O12, in the spectra range of 0.45-0.80 μm. A rotation peak near 0.47 μm was found. The room temperature dependence of the rotation peak value 2θK(0.47μm) on the composition was obtained by varying the substitution quantity of In3+ and Bi3+. It was found that the Kerr rotation change sign abruptly when varying the composition across the magnetization compensation point, however, the absolute value of the rotation does not reduce when the composition approaches that point, while the total magnetization 4πMs, does decrease, we also found that, with the In3+ content increasing, the Kerr rotation is "enhanced" at first, reaching a maximum at y0.15, and then reduces. Using a model that the total Kerr rotation is the Bi3+ enhanced superposition of the sublattice Kerr rotation, we explained the "enhancement" of Kerr rotation by indium substitution. From fitting the experiment results, we deduced the ratio of the sublattice rotation coefficients (α4/α8) to be about 1.5, that is, the absolute contribution of every Fe3+ on tetrahedral site to the magneto-optic rotation is about 1.5 times as large as that on octahedral site. The results demonstrated that a good magneto-optic material can be synthesized in x3+ substitution. Considering its low and variable magnetization, high Curie temperature and rather large magneto-optic rotation, the In-BCVIG system, surely, is a promising cadidate in the variety of usage of the magneto-optic devices.