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Title: Magnetotransport properties of strontium doped lanthanum manganite nanoconstriction array
Keywords: Manganite, Magnetic nanoconstriction, Magnetoresistance, Phase separation, double exchange interaction, domain wall resistance
Issue Date: 3-Dec-2007
Citation: LIU HUAJUN (2007-12-03). Magnetotransport properties of strontium doped lanthanum manganite nanoconstriction array. ScholarBank@NUS Repository.
Abstract: In this work, we developed an economic method for the fabrication of nanopatterned multicomponent oxide thin film through a combination of the technique of nanosphere lithography and pulsed laser deposition. By employing this developed method, the La0.67Sr0.33MnO3 nanoconstriction array in four different physical states has been successfully fabricated with the lateral size ranging from sub-100 nanometers to several hundred nanometers. The magnetotransport measurements showed that all the nanoconstriction arrays in defect states exhibited strong nonlinear (bias current dependent) magnetotransport behaviours and large low field magnetoresistances (MR) at a low temperature. In contrast, for the nanoconstriction in intrinsic ferromagnetic state, no nonlinearity and low field MR were observed. It seems that the nonlinear transport properties and the large low field magnetoresistance are most probably extrinsic properties of the nanoconstriction due to its defect state, rather than the intrinsic behaviour of the magnetic nanoconstriction.
Appears in Collections:Ph.D Theses (Open)

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