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Research and Publications - Department of Metallurgical and Materials Engineering

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Browsing Research and Publications - Department of Metallurgical and Materials Engineering by Subject "ANISOTROPY"

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    Local probing of magnetoelectric coupling and magnetoelastic control of switching in BiFeO3-CoFe2O4 thin-film nanocomposite
    (American Institute of Physics, 2013-07-25) Yan, Feng; Chen, Guannan; Lu, Li; Finkel, Peter; Spanier, Jonathan E.; University of Pennsylvania; National University of Singapore; University of Alabama Tuscaloosa
    We report on the combination of piezoresponse force microscopy (PFM), magnetic force microscopy, and local ferroelectric switching with magnetic field for the study of a thin-film magnetoelectric (ME) nanocomposite. The collection of PFM under an applied variable magnetic field within a polycrystalline perovskite-spinel BiFeO3-CoFe2O4 (BFO-CFO) 0-3 type thin-film nanocomposite enables quantitative and proximal measurement of magnetoelastic strain-driven ME response. Combination of measurement of the as-grown strain state with local measurements of microstructure and macroscopic magnetization permits local mapping of ME coupling. (C) 2013 AIP Publishing LLC.
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    Magnetic field control of charge excitations in CoFe2O4
    (American Institute of Physics, 2018) Holinsworth, Brian S.; Harms, Nathan C.; Fan, Shiyu; Mazumdar, Dipanjan; Gupta, Arun; McGill, Stephen A.; Musfeldt, Janice L.; University of Tennessee Knoxville; University of Alabama Tuscaloosa; Florida State University; Southern Illinois University
    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. (C) 2018 Author(s).