Magnetic Field Control of Charge Excitations in CoFe2O4

Source Publication (e.g., journal title)

APL Materials

Authors

Brian S. Holinsworth, University of Tennessee, Knoxville
Nathan C. Harms, University of Tennessee, Knoxville
Shiyu Fan, University of Tennessee, Knoxville
Dipanjan Mazumdar, University of Tennessee, Knoxville
Arun Gupta, University of Alabama
Stephen A. McGill, Florida State University
Janice L. Musfeldt, University of Tennessee, KnoxvilleFollow

Document Type

Article

Publication Date

6-28-2018

DOI

10.1063/1.5021792

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.

Comments

This article was published openly thanks to the University of Tennessee Open Publishing Support Fund.

Licensed under a Creative Commons Attribution 4.0 International license.

Recommended Citation

Holinsworth, Brian S., Nathan C. Harms, Shiyu Fan, Dipanjan Mazumdar, Arun Gupta, Stephen A. McGill, and Janice L. Musfeldt. “Magnetic Field Control of Charge Excitations in CoFe2O4.” APL Materials 6 (2018). https://doi.org/10.1063/1.5021792.

Submission Type

Publisher's Version