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Title: Magnetic field control of charge excitations in CoFe 2O 4

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 CoFe 2O 4. 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.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Alabama, Tuscaloosa, AL (United States)
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Science Division; USDOE
OSTI Identifier:
1501819
Alternate Identifier(s):
OSTI ID: 1457516
Grant/Contract Number:  
FG02-01ER45885
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 6; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Holinsworth, Brian S., Harms, Nathan C., Fan, Shiyu, Mazumdar, Dipanjan, Gupta, Arun, McGill, Stephen A., and Musfeldt, Janice L. Magnetic field control of charge excitations in CoFe2O4. United States: N. p., 2018. Web. doi:10.1063/1.5021792.
Holinsworth, Brian S., Harms, Nathan C., Fan, Shiyu, Mazumdar, Dipanjan, Gupta, Arun, McGill, Stephen A., & Musfeldt, Janice L. Magnetic field control of charge excitations in CoFe2O4. United States. doi:10.1063/1.5021792.
Holinsworth, Brian S., Harms, Nathan C., Fan, Shiyu, Mazumdar, Dipanjan, Gupta, Arun, McGill, Stephen A., and Musfeldt, Janice L. Thu . "Magnetic field control of charge excitations in CoFe2O4". United States. doi:10.1063/1.5021792. https://www.osti.gov/servlets/purl/1501819.
@article{osti_1501819,
title = {Magnetic field control of charge excitations in CoFe2O4},
author = {Holinsworth, Brian S. and Harms, Nathan C. and Fan, Shiyu and Mazumdar, Dipanjan and Gupta, Arun and McGill, Stephen A. and Musfeldt, Janice L.},
abstractNote = {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.},
doi = {10.1063/1.5021792},
journal = {APL Materials},
number = 6,
volume = 6,
place = {United States},
year = {2018},
month = {6}
}

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