Magnetic excitations and anomalous spin wave broadening in multiferroic FeV2O4

Abstract

We report on the different roles of two orbital-active Fe${}^{2+}$ at the A site and V${}^{3+}$ at the B site in the magnetic excitations and on the anomalous spin wave broadening in FeV${}_2$O${}_4$. FeV${}_2$O${}_4$ exhibits three structural transitions and successive paramagnetic (PM)-collinear ferrimagnetic (CFI)-noncollinear ferrimagnetic (NCFI) transitions. The high-temperature tetragonal/PM -orthorhombic/CFI transition is accompanied by the appearance of an energy gap with a high magnitude in the magnetic excitations due to strong spin-orbit coupling induced anisotropy at the Fe${}^{2+}$ site. While there is no measurable increase in the energy gap from the orbital ordering of V${}^{3+}$ at the orthorhombic/CFI-tetragonal/NCFI transition, anomalous spin wave broadening is observed in the orthorhombic/CFI state due to V${}^{3+}$ spin fluctuations at the B site. The spin wave broadening is also observed at the zone boundary without softening, which is discussed in terms of magnon-phonon coupling.

4 pages, 3 figures, including one supplemental material

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Cited by in corpus (1)

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