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| Home > Publications database > Mechanisms for Multiferroicity in Rare Earth Orthoferrites: An Overview |
| Poster (After Call) | FZJ-2025-05387 |
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2025
Abstract: Rare-earth orthoferrites, RFeO₃(R=rare earth element), have been model systems for studies and theoretical considerations of magnetic structures since the 1960s [Whi69]. They have regained considerable interest in the last decade due to their complex multiferroic properties, which make them potential candidates for modern applications, e.g. in the field of spintronics [Tok12,Lee11]. Recently DFG(SA-3688/1-1) project has been completed, in which we have used various experimental methods, mainly elastic and inelastic neutron scattering for precise magnetic order determination.The fragile balance between R3+ and Fe3+ magnetic lattices results in very different magnetic phase diagrams for HoFeO₃[Ovs22a], YbFeO₃[Ovs22c] and TmFeO₃[InPrep]. A new low-symmetry magnetic phase in HoFeO₃[Ovs22b] was found in temperatures where a large magnetocaloric effect is reported. Magnetic interaction parameters for HoFeO₃[Ovs20], TbFeO₃[Ovs22c], DyFeO₃[InPrep] and LuFeO₃[InPrep] have been determined. Incommensurate magnetic ordering on DyFeO₃ single crystal was observed and characterized using spherical neutron polarimetry [InPrep].We have consistently observed the characteristic hierarchy of interaction strengths in RFeO₃ systems. The strongest is the Fe-Fe exchange interaction leading to antiferromagnetic correlations, then Dzyaloshinskii-Moriya interaction leading to spin canting, single-ion anisotropy that stabilizes the system, and finally the R-R and R-Fe exchange interactions. The latter is responsible for the long-range ordering of the R sublattice, and despite small value causes spin-reorientation of the Fe lattice, due to the large moment of R ions. In our presentation we give an overview of the results of the orthoferrites we have been investigating.[InPrep] In preparation[Lee11] J.-H. Lee et al.; PRL107 (2011) 117201.[Mar70] M. Marezio et al.; Acta Cryst. B26 (1970) 2008.[Ovs20] A.K. Ovsyanikov et al.; JMMM507 (2020) 166855.[Ovs22a] A.K. Ovsianikov et al.; JMMM557 (2022) 169431.[Ovs22b] A.K. Ovsianikov et al.; IEEE Trans. Magn. 58 (2022) 2500105.[Ovs22c] A.K. Ovsianikov et al.; JMMM563 (2022) 170025.[Tok12] Y. Tokunaga et al.; Nat.Phys. 8 (2012) 838.
Keyword(s): Magnetic Materials (1st) ; Information and Communication (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)
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