Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 57: Multiferroics (DF and MA)
MA 57.6: Vortrag
Donnerstag, 23. März 2017, 16:30–16:45, WIL B321
Collective spin excitations in polar ferrimagnet (Fe,Zn)2Mo3O8 — •Krisztián Szász1, Dávid Szaller1, Urmas Nagel2, Toomas Rõõm2, Sándor Bordács1, and István Kézsmárki1 — 1Department of Physics, Budapest University of Technology and Economics, 1111 Budapest, Hungary — 2National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
In this work the magnetic excitations are investigated in Zn-doped hexagonal polar Fe2Mo3O8 crystal using terahertz spectroscopy. This material is a promising candidate in realizing new generation electronic devices utilizing its giant magnetoelectric effect, i.e. high jump is observed in the polarization when the antiferromagnetic-ferrimagnetic spin-flop transition occurs. The different magnetic phases can be controlled by doping without losing the huge magnetoelectric effect. Microscopically, the Zn-doping fills the tetrahedral Fe sublattice while the octahedral Fe sites remain intact.
Our purpose is to understand the magnetic ground state which is still unclear. Furthermore, from the magnetic field dependence of the magnon modes we aim to deduce the most important exchange and anisotropy parameters to construct a spin model of Fe2Mo3O8.