Abstract.
Nano-constriction array in La0.67Sr0.33MnO3 film was fabricated by using ion beam etching masked by a monolayer of packed and ordered array of SiO2 microspheres. Nano-constrictions of around 50 nm in width were fabricated. The low field magnetoresistance (LFMR) exhibited in the samples were observed to be current dependent and the I-V characteristics of the film were found to be nonlinear. These observations were attributed to the co-existence of the ferromagnetic regions and the nano-constricted region of weakened ferromagnetic coupling where Mn3+-O-Mn4+ bond were distorted due to the ion beam bombardment. The spin polarized bias current would strengthen local ferromagnetic coupling when passing through this nano-constricted regions. This current effect is relatively large comparing to the external magnetic field to the drop of resistance.
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Liu, H., Yang, T., Goh, W. et al. Magnetotransport properties of nano-constriction array in La0.67Sr0.33MnO3 film. Eur. Phys. J. B 48, 37–40 (2005). https://doi.org/10.1140/epjb/e2005-00371-4
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DOI: https://doi.org/10.1140/epjb/e2005-00371-4