Magnetic model in multiferroic NdFe3(BO3)4 investigated by inelastic neutron scattering

S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda
Phys. Rev. B 92, 054402 – Published 4 August 2015

Abstract

We performed inelastic neutron scattering measurements on single crystals of NdFe3(BO311)4 to explore the magnetic excitations, to establish the underlying Hamiltonian, and to reveal the detailed nature of hybridization between the 4f and 3d magnetism. The observed spectra exhibiting a couple of key features, i.e., anticrossing of Nd and Fe excitations and anisotropy gap at the antiferromagnetic zone center, are explained by the magnetic model including spin interaction in the framework of weakly coupled Fe3+ chains, interaction between the Fe3+ and Nd3+ moments, and single-ion anisotropy derived from the Nd3+ crystal field. The combination of the measurements and calculations reveals that the hybridization between 4f and 3d magnetism propagates the local magnetic anisotropy of the Nd3+ moment to the Fe3+ network, leading to the determination of the bulk structure of both electric polarization and magnetic moment in the multiferroics of the spin-dependent metal-ligand hybridization type.

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  • Received 30 May 2015

DOI:https://doi.org/10.1103/PhysRevB.92.054402

©2015 American Physical Society

Authors & Affiliations

S. Hayashida1, M. Soda1, S. Itoh2, T. Yokoo2, K. Ohgushi3, D. Kawana1, H. M. Rønnow1,4, and T. Masuda1

  • 1Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan
  • 2Neutron Science Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
  • 3Department of Physics, Tohoku University, Sendai, Miyagi 980-8581, Japan
  • 4Laboratory for Quantum Magnetism, École Polytechnique Fédérale Lausanne (EPFL), CH-1015 Lausanne, Switzerland

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Vol. 92, Iss. 5 — 1 August 2015

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