Holinsworth Brian S, Harms Nathan C, Fan Shiyu, Mazumdar Dipanjan, Gupta Arun, McGill Stephen A, Musfeldt Janice L
Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA.
APL Mater. 2018 Jun 1;6(6):066110. doi: 10.1063/1.5021792.
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 CoFeO. 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.
我们将磁圆二色性和光电导率与先前的光吸收和第一性原理计算相结合，以揭示高居里温度磁体CoFeO中的自旋-电荷相互作用。除了修正带隙层次结构外，我们还揭示了自旋向下通道中一系列广泛的电荷转移激发，这些激发对涉及Co中心自旋态的亚磁转变敏感。我们还展示了依赖于外加磁场的光电导率。这些发现为通过尖晶石铁氧体和其他储量丰富的材料中的少数通道电荷转移来产生和控制自旋极化电子激发打开了大门。
