Magnetic field control of charge excitations in CoFe2O4

Holinsworth, Brian S.; Harms, Nathan C.; Fan, Shiyu; Mazumdar, Dipanjan; Gupta, Arun; McGill, Stephen A.; Musfeldt, Janice L.

doi:10.1063/1.5021792

Title: Magnetic field control of charge excitations in CoFe₂O₄

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.

Authors:

Holinsworth, Brian S. ^[1]; Harms, Nathan C. ^[1];

^[1];

^[1]; Gupta, Arun ^[2]; McGill, Stephen A. ^[3];

^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Alabama, Tuscaloosa, AL (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)

Publication Date:: Thu Jun 28 00:00:00 EDT 2018

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.

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                    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.  https://doi.org/10.1063/1.5021792

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                    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.  https://doi.org/10.1063/1.5021792.  https://www.osti.gov/servlets/purl/1501819.

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@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         = {Thu Jun 28 00:00:00 EDT 2018},

  month        = {Thu Jun 28 00:00:00 EDT 2018}

}

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Title: Magnetic field control of charge excitations in CoFe2O4

Abstract

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Title: Magnetic field control of charge excitations in CoFe₂O₄

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Spin-filtering efficiency of ferrimagnetic spinels CoFe $_{2}$ O $_{4}$ and NiFe $_{2}$ O $_{4}$
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Structure, magnetic ordering, and spin filtering efficiency of NiFe ₂ O ₄ (111) ultrathin films
journal, May 2014

Cation Distributions in Octahedral and Tetrahedral Sites of the Ferrimagnetic Spinel CoFe ₂ O ₄
journal, February 1968

High-field magnetic circular dichroism in ferromagnetic InMnSb and InMnAs: Spin-orbit-split hole bands and $g$ factors
journal, September 2015

Chemical tuning of the optical band gap in spinel ferrites: CoFe ₂ O ₄ vs NiFe ₂ O ₄
journal, August 2013

Controlling the Curie temperature in (Ga,Mn)As through location of the Fermi level within the impurity band
journal, February 2012