The current-voltage relations and magnetotransport properties of La 0.7Sr 0.3MnO 3/Si-nanotips and La 0.7Sr 0.3MnO 3/Si-film junctions are studied, revealing that their transport properties are dominated by various mechanisms depending on temperature and bias voltage. A giant positive magnetoresistance (PMR) of ∼200% is observed at 40 K in La 0.7Sr 0.3MnO 3/Si-nanotips junction. The temperature dependence of resistance in the presence of magnetic field suggests the origin of giant PMR to be the strong electron-electron interaction and electron-magnon scattering. Interestingly, such behavior is not observed in regular La 0.7Sr 0.3MnO 3/Si-film junction, implying that the coupling between spin and charge could be greatly enhanced at the interface of La 0.7Sr 0.3MnO 3 and Si nanotips.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films