Nonlinear current-voltage behavior and giant positive magnetoresistance in nonmagnetic Au/Yttria-stabilized zirconia/Si heterostructures

Qu, T. L.; Li, J.; Zhao, Y. G.; Mei, J. W.; Liu, X.; Tian, H. F.; Shi, J. P.; Guo, S. M.; Zheng, D. N.; Li, J. Q.
December 2009
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p242113
Academic Journal
We report on the nonlinear current-voltage (I-V) behavior and giant positive magnetoresistance (GPMR) in the Au/Yttria-stabilized zirconia/Si heterostructures. The I-V curves of the heterostructures show a rectifying property and follow the Fowler–Nordheim tunneling behavior for the larger forward bias voltages. The GPMR of the samples increases with decreasing temperature and exceeds 100 000% in a magnetic field of 7 T at 20 K with a voltage of +4 V. It also shows anisotropy with magnetoresistance for the magnetic field perpendicular to the current larger than that of the parallel case. A possible mechanism was proposed to account for the results.


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