Negative differential resistance and magnetotransport in Fe3O4/SiO2/Si heterostructures
Type
ArticleKAUST Department
Imaging & Characterization LaboratoryImaging and Characterization Core Lab
Material Science and Engineering Program
Nanofabrication Core Lab
Physical Science and Engineering (PSE) Division
Thin Films & Characterization
Date
2019-06-17Embargo End Date
2020-06-17Permanent link to this record
http://hdl.handle.net/10754/656141
Metadata
Show full item recordAbstract
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:10.1063/1.5092872Sponsors
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 PublishingJournal
Applied Physics LettersAdditional Links
http://aip.scitation.org/doi/10.1063/1.5092872ae974a485f413a2113503eed53cd6c53
10.1063/1.5092872