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Title: Magnetic excitations and anomalous spin wave broadening in multiferroic FeV2O4

FeV2O4 is found to show three structural transitions and successive paramagnetic(PM)- collinear ferrimagnetic(CFI)-nocollinear ferrimagnetic(NCFI) magnetic transitions. The tetragonal- orthorhombic structural transition associated with PM-CFI transition is accompanied by the ap- pearance of an energy gap with a high magnitude in the magnetic excitation spectrum, which is a consequence of the strong spin-orbital coupling induced anisotropy at Fe2+ A site. The comparison of Fe spin waves at CFI and noncollinear ferrimagnetic/ferroelectric phases shows no signicant spin frustration of Fe2+ spins at A site, suggesting A-site Fe2+ spins may not play a main role in the appearance of the ferroelectricity. Spin wave damping shows a rapid increase when NCFI transforms to CFI phase, indicating a possible V3+ spin uctuations at B site prior to their true canting in the NCFI phase. The spin wave broadening is also observed at the zone boundary without the spin wave softening, which is discussed in terms of the eect of magnon-phonon coupling. Understanding the
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2]
  1. Ames Laboratory and Iowa State University
  2. Ames Laboratory
  3. ORNL
Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 89; Journal Issue: 22
Research Org:
Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor (HFIR)
Sponsoring Org:
SC USDOE - Office of Science (SC)
Country of Publication:
United States