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High-field soft-x-ray dichroism of a hard ferrimagnet with easy-plane anisotropy
Yamamoto, S.; Gorbunov, D.; Diaz-Ortega, I. F.; Miyata, A.; Kihara, T.; Kotani, Y.; Nakamura, T.; Mushnikov, N. V.; Andreev, A. V.; Nojiri, H.; Wosnitza, J.
We performed soft x-ray spectroscopic studies of the ferrimagnet TbFe5Al7 with strong easy-plane anisotropy in pulsed magnetic fields up to 29 T along with bulk magnetization and magnetostriction measurements. We observed pronounced amplitude changes of x-ray magnetic circular dichroism and x-ray absorption spectra at the field-induced magnetic transition. This microscopically evidences the simultaneous rotation of the Tb 4 f and Fe 3d magnetic moments from a collinear ferrimagnetic order along the  axis to a state with the moments close to , the other easy-axis direction of the tetragonal lattice in magnetic fields applied along the  axis. We determined the magnetic-anisotropy constant of TbFe5Al7 by simulating the high-field macro- and microscopic magnetization process using a two-sublattice model.
Physical Review B 104(2021), 064405
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