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    Negative differential resistance and magnetotransport in Fe3O4/SiO2/Si heterostructures

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    Type
    Article
    Authors
    Liu, Xiang
    Mi, Wenbo
    Zhang, Qiang cc
    Zhang, Xixiang cc
    KAUST Department
    Imaging & Characterization Laboratory
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Nanofabrication Core Lab
    Physical Science and Engineering (PSE) Division
    Thin Films & Characterization
    Date
    2019-06-17
    Embargo End Date
    2020-06-17
    Permanent link to this record
    http://hdl.handle.net/10754/656141
    
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    Abstract
    The electronic transport and magnetotransport properties of Fe3O4/SiO2/Si heterostructures were investigated with a current source. Negative differential resistance is observed in Fe3O4/SiO2/p-Si heterostructures. The measurement circuit with four electrodes that I+ (I−) and V+ (V−) came into contact with the Fe3O4 (Si) layer introduces an in-plane transport into the heterostructures. By decreasing the temperature, the in-plane conductive channel switches from Fe3O4 to p-Si. However, the in-plane current is still carried by Fe3O4 in Fe3O4/SiO2/n-Si heterostructures. The formation of an accumulation layer in p-Si facilitates conductive channel switching (CCS), while the depletion layer in n-Si hampers the CCS. At 150 K, a magnetic-field-independent magnetoresistance (MR) in Fe3O4/SiO2/p-Si heterostructures manifests the conductive channel in the space charge region of p-Si. A positive MR generated from the increased electronic scattering in a trapezoidal space charge region reshaped by the magnetic field has been detected.
    Citation
    Liu, X., Mi, W., Zhang, Q., & Zhang, X. (2019). Negative differential resistance and magnetotransport in Fe3O4/SiO2/Si heterostructures. Applied Physics Letters, 114(24), 242402. doi:10.1063/1.5092872
    Sponsors
    This work was supported by the National Natural Science Foundation of China (No. U1632152) and Key Project of Natural Science Foundation of Tianjin (No. 16JCZDJC37300).
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    DOI
    10.1063/1.5092872
    Additional Links
    http://aip.scitation.org/doi/10.1063/1.5092872
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5092872
    Scopus Count
    Collections
    Nanofabrication Core Lab; Nanofabrication Core Lab; Articles; Imaging and Characterization Core Lab; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; Material Science and Engineering Program

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