title: On the structural origin of the single-ion magnetic anisotropy in LuFeO3.
abstract: The electronic structure for the conduction bands of both hexagonal and orthorhombic LuFeO3 thin films have been measured using x-ray absorption spectroscopy at oxygen K (O K) edge. Dramatic differences in both the spectral features and the linear dichroism are observed. These differences in the spectra can be explained using the differences in crystal field splitting of the metal (Fe and Lu) electronic states and the differences in O 2p-Fe 3d and O 2p-Lu 5d hybridizations. While the oxidation states have not changed, the spectra are sensitive to the changes in the local environments of the Fe(3+) and Lu(3+) sites in the hexagonal and orthorhombic structures. Using the crystal-field splitting and the hybridizations that are extracted from the measured electronic structures and the structural distortion information, we derived the occupancies of the spin minority states in Fe(3+), which are non-zero and uneven. The single ion anisotropy on Fe(3+) sites is found to originate from these uneven occupancies of the spin minority states via spin-orbit coupling in LuFeO3.
authors.affiliation: Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, USA.
authors.forename: Shi
authors.initials: S
authors.lastname: Cao
authors.forename: Xiaozhe
authors.initials: X
authors.lastname: Zhang
authors.forename: Tula R
authors.initials: TR
authors.lastname: Paudel
authors.forename: Kishan
authors.initials: K
authors.lastname: Sinha
authors.forename: Xiao
authors.initials: X
authors.lastname: Wang
authors.forename: Xuanyuan
authors.initials: X
authors.lastname: Jiang
authors.forename: Wenbin
authors.initials: W
authors.lastname: Wang
authors.forename: Stuart
authors.initials: S
authors.lastname: Brutsche
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Ryan
authors.forename: Jong-Woo
authors.initials: JW
authors.lastname: Kim
authors.forename: Xuemei
authors.initials: X
authors.lastname: Cheng
authors.forename: Evgeny Y
authors.initials: EY
authors.lastname: Tsymbal
authors.forename: Peter A
authors.initials: PA
authors.lastname: Dowben
authors.forename: Xiaoshan
authors.initials: X
authors.lastname: Xu