Sprecher
Beschreibung
Rare-earth orthoferrites (RFeO₃, where R is a rare earth element) have been used as model systems in studies and theoretical considerations of magnetic structures since the 1960s [1]. Their complex multiferroic properties have made them potential candidates for modern applications, e.g. in the field of spintronics, and they have therefore regained considerable interest in the last years [2, 3, 4].
We investigated magnetic excitations in ErFeO₃ and LuFeO₃ using inelastic neutron scattering [5], the latter having only Fe as magnetic ions. The observed magnon dispersions and spectral intensities can be accurately reproduced within the framework of linear spin wave theory. This enables us to extract the key exchange parameters that govern the Fe–Fe interactions. In ErFeO₃, we modelled the Er³⁺ crystal field levels by refining a point-charge model guided by experimentally determined transition energies and their relative intensities.
[1] R. J. White, J. Appl. Phys., 40, 1061 (1969).
[2] J.-H. Lee et al., Phys. Rev. Lett., 107, 117201 (2011).
[3] Y. Tokunaga et al., Nat. Phys., 8, 838 (2012).
[4] J. Xu et al., Phys. Rev. Lett. 129, 117202 (2022).
[5] In preparation
