We combine magnetic circular dichroism and photoconductivity with prior optical absorption and first principles calculations to unravel spin-charge interactions in the high Curie temperature magnet CoFe2O4. In addition to revising the bandgap hierarchy, we reveal a broad set of charge transfer excitations in the spin down channel which are sensitive to the metamagnetic transition involving the spin state on Co centers. We also show photoconductivity that depends on an applied magnetic field. These findings open the door for the creation and control of spin-polarized electronic excitations from the minority channel charge transfer in spinel ferrites and other earth-abundant materials.

中文翻译：

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CoFe2O4 中电荷激发的磁场控制


我们将磁性圆二色性和光电导性与先前的光学吸收和第一原理计算相结合，以揭示高居里温度磁体 CoFe2O4 中的自旋电荷相互作用。除了修改带隙层次结构之外，我们还揭示了自旋向下通道中广泛的电荷转移激发，这些激发对涉及 Co 中心自旋状态的变磁转变敏感。我们还展示了取决于所施加磁场的光电导性。这些发现为通过尖晶石铁氧体和其他地球丰富的材料中的少数通道电荷转移产生和控制自旋极化电子激发打开了大门。