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    Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation

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    Type
    Article
    Authors
    Li, Peng cc
    Xia, Chuan cc
    Li, Jun
    Zhu, Zhiyong
    Wen, Yan
    Zhang, Qiang cc
    Zhang, Junwei
    Peng, Yong
    Alshareef, Husam N. cc
    Zhang, Xixiang cc
    KAUST Department
    Functional Nanomaterials and Devices Research Group
    Imaging and Characterization Core Lab
    KAUST Supercomputing Laboratory (KSL)
    Material Science and Engineering Program
    Nanofabrication Core Lab
    Physical Science and Engineering (PSE) Division
    Supercomputing, Computational Scientists
    Thin Films & Characterization
    KAUST Grant Number
    CRF-2015-SENSORS-2709
    Date
    2017-05-10
    Online Publication Date
    2017-05-10
    Print Publication Date
    2017-05-23
    Permanent link to this record
    http://hdl.handle.net/10754/623913
    
    Metadata
    Show full item record
    Abstract
    The coexistence of ferromagnetic metallic phase and antiferromagnetic insulating phase in nanoscaled inhomogeneous perovskite oxides accounts for the colossal magnetoresistance. Although the model of spin-polarized electron transport across antiphase boundaries has been commonly employed to account for large magnetoresistance (MR) in ferrites, the magnetic anomalies, the two magnetic phases and enhanced molecular moment, are still unresolved. We observed a sizable MR in epitaxial spinel films (NiCo2O4-δ) that is much larger than that commonly observed in spinel ferrites. Detailed analysis reveals that this MR can be attributed to phase separation, in which the perfect ferrimagnetic metallic phase and ferrimagnetic insulating phase coexist. The magnetic insulating phase plays an important role in spin filtering in these phase separated spinel oxides, leading to a sizable MR effect. A spin filtering model based on Zeeman effect and direct tunneling is developed to account for MR of the phase separated films.
    Citation
    Li P, Xia C, Li J, Zhu Z, Wen Y, et al. (2017) Spin Filtering in Epitaxial Spinel Films with Nanoscale Phase Separation. ACS Nano 11: 5011–5019. Available: http://dx.doi.org/10.1021/acsnano.7b01743.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). P.L. acknowledges the financial support of CRF-2015-SENSORS-2709 (KAUST) and SABIC postdoctoral fellowship award presented to KAUST.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/acsnano.7b01743
    PubMed ID
    28480708
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acsnano.7b01743
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsnano.7b01743
    Scopus Count
    Collections
    Nanofabrication Core Lab; Articles; Imaging and Characterization Core Lab; KAUST Supercomputing Laboratory (KSL); Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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