On the Structural Origin of the Single-ion Magnetic Anisotropy in LuFeO3

Abstract

Electronic structures 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 spectra shape 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 has not changed, the spectra are sensitive to the changes in the local environments of the Fe3+ and Lu3+ 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 Fe3+, which are non-zero and uneven. The single ion anisotropy on Fe3+ sites is found to originate from these uneven occupancies of the spin minority states via spin-orbit coupling in LuFeO3.

References in corpus (6)

• Room-temperature multiferroic hexagonal LuFeO${}_3$ films
• Bulk magnetoelectricity in the hexagonal manganites and ferrites
• Magnetic Structure and Ordering of Multiferroic Hexagonal LuFeO3
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• Magnetic excitations in bulk multiferroic two-dimensional triangular lattice antiferromagnet (Lu,Sc)FeO${}_3$
• Magnetoelectric coupling and decoupling in multiferroic hexagonal YbFeO3 thin films
• Effects of biaxial strain on the improper multiferroicity in h-LuFeO3 films
• Phase separation in LuFeO3 films
• Effect of interface on epitaxy and magnetism in h-RFeO3/Fe3O4/Al2O3 films (R=Lu, Yb)
• Recent Progress on Multiferroic Hexagonal Rare-Earth Ferrites (h-RFeO3, R = Y,Dy-Lu)
• Tailoring non-collinear magnetism and 3d $-$ 4f exchange interactions in RVO${}_3$ epitaxial thin films