Speaker
Description
Yttrium iron garnet (Y$_3$Fe$_5$O$_{12}$) has, since its discovery in 1957, fundamentally contributed to the development of important research fields such as spintronics, magnonics and hybrid quantum information systems. Iron garnets incorporating magnetic rare-earth ions are relatively less well-known, but have also been studied for their interesting spin transport phenomena, magnetoelectric properties and magneto-optical effects. Following our zero-field work on the complete spectrum of Yb$_3$Fe$_5$O$_{12}$ [1] we extend our study to understand the effect of magnetic fields on the low energy magnetic excitations of the compound. A notable observation is a magnetic phase transition that takes place when the field is applied along the <111> crystallographic directions relative to the cubic unit cell. Using new, extensive inelastic neutron scattering data, we show how magnetic fields up to 7 T influence the hybridised 4f–3d magnetic excitations of the compound, and describe how the new experimental findings may be described within the magnetic model we recently developed for Yb$_3$Fe$_5$O$_{12}$ [1].
[1] V. Peçanha Antonio et al. Phys. Rev. B 105, 104422 (2022)
