A polarized light beam modifies the equilibrium tensors associated with any measurable property of a crystal. The light-induced linear magnetoelectric susceptibility and electric current density of bismuth ferrite (BFO) are investigated theoretically using their expansion in Wigner spherical functions. Under illumination, the interplay between magnetoelectric and photovoltaic properties yields the emergence in the paramagnetic and multiferroic phases of BFO of linear photomagnetoelectric tensor components changing sign in domains with opposite electric polarization or magnetization, and to magnetophotocurrents changing sense in opposite ferroelectric and magnetic domains.

中文翻译：

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多铁BiFeO3中的光电和磁光效应

偏振光束会改变与晶体的任何可测量特性相关的平衡张量。利用Wigner球面函数的展开，从理论上研究了铋铁氧体（BFO）的光感应线性磁化率和电流密度。在光照下，磁电性质和光伏性质之间的相互作用会导致线性光电磁张量分量的BFO的顺磁相和多铁相出现，从而在极性相反或磁化相反的区域中改变符号，而在相反的铁电和磁化领域中改变磁光电流的方向。