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MA: Fachverband Magnetismus
MA 5: Spin Structures and Magnetic Phase Transitions I
MA 5.10: Talk
Monday, March 18, 2024, 12:00–12:15, EB 202
Origin of the antiparallel spin coupling of a Nd3Fe3Sb7 single crystal. — •Sabrina Palazzese1,4, F. Pabst3, Sh. Yamamoto1, K. Kummer2, D. Gorbunov1, S. Chattopadhyay1, T. Herrmannsdoerfer1, M. Richter5, R. Ray5, M. Ruck3, E. Weschke6, O. Prokhnenko6, B. Lake6, and J. Wosnitza1,4 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden — 2European Synchrotron Radiation Facility (ESRF) — 3Fakultät für Chemie und Lebensmittelchemie, TU Dresden — 4Institut für Festkörper- und Materialphysik, TU Dresden — 5Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) — 6Helmholtz-Zentrum Berlin (HZB)
We investigated Nd3Fe3Sb7 using SQUID magnetometry and X-ray magnetic circular dichroism. Previous studies on polycrystalline samples show that Nd3Fe3Sb7 exhibits a rather complex magnetism [1]. We found an unusual antiparallel coupling between the magnetic moments of Nd 4f and Fe 3d along the c-axis. This is also observed in the isostructural compound Pr3Fe3Sb7, as demonstrated by neutron diffraction [2], but the origin of this behavior has not been further elucidated. The compound shows ferrimagnetic ordering below the spin-reorientation transition and planar magnetic anisotropy above it. DFT calculations indicate an induced magnetic moment in the Sb atoms. We attribute the antiparallel coupling to a potential superexchange interaction mediated by the Sb atoms.
[1] N. Nasir, et al., Intermetallics 18, 2361 (2010).
[2] F. Pabst, et al., Adv. Mat. 35, 2207945 (2023).
Keywords: spin-reorientation; magnetization; molecular field; anisotropy; ferrimagnetism