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Title: Magnetotransport properties of nano-constriction array in La 0.67Sr0.33MnO3 film
Authors: Liu, H.J.
Yang, T.
Goh, W.C. 
Sow, C.H. 
Piramanayagam, S.N.
Ong, C.K. 
Issue Date: Nov-2005
Citation: Liu, H.J., Yang, T., Goh, W.C., Sow, C.H., Piramanayagam, S.N., Ong, C.K. (2005-11). Magnetotransport properties of nano-constriction array in La 0.67Sr0.33MnO3 film. European Physical Journal B 48 (1) : 37-40. ScholarBank@NUS Repository.
Abstract: Nano-constriction array in La0.67Sr0.33MnO 3 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 Mn 3+-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.
Source Title: European Physical Journal B
ISSN: 14346028
DOI: 10.1140/epjb/e2005-00371-4
Appears in Collections:Staff Publications

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