Magnetic field control of charge excitations in CoFe2O4
Source abstract
Abstract
We combine magnetic circular dichroism and photoconductivity with prior optical absorption and first principles calculations to unravel spin-charge interactions in the high Curie temperature magnet CoFe2O4. In addition to revising the bandgap hierarchy, we reveal a broad set of charge transfer excitations in the spin down channel which are sensitive to the metamagnetic transition involving the spin state on Co centers. We also show photoconductivity that depends on an applied magnetic field. These findings open the door for the creation and control of spin-polarized electronic excitations from the minority channel charge transfer in spinel ferrites and other earth-abundant materials.
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Research context
OpenAlex topics: Multiferroics and related materials · Magnetic Properties and Synthesis of Ferrites · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, University of Tennessee 1 , Knoxville, Tennessee 37996, USA
Department of Physics, University of Tennessee 2 , Knoxville, Tennessee 37996, USA
Center for Materials for Information Technology, University of Alabama 3 , Tuscaloosa, Alabama 35487, USA
National High Magnetic Field Laboratory, Florida State University 4 , Tallahassee, Florida 32310, USA
Funding
National Science Foundation · National Institutes of Health · U.S. Department of Energy
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