Field dependence of magnetoresistance in half-metallic manganite
作者： Zheng-Ming Zhang , Xing-Chen Zhao , Wei-Ping Zhou
关键词: Condensed matter physics 、 Materials science 、 Magnetoresistance 、 Manganite 、 Charge carrier 、 Ferromagnetism 、 Magnetic field 、 Grain boundary 、 Electrical resistivity and conductivity 、 Field dependence
摘要: Formular description of the magnetic field dependence resistivity is interest not only because its theoretical importance, but also it allows us to design magnetic-field-controlled devices. Using micromagnetic theory combined with charge carrier hopping and spin-polarized tunneling models, in half-metallic ferromagnet La 2/3 Sr 1/3 MnO 3 has been studied systematically. It shown that linearly dependent on a single grain. As for grain boundary (GB), namely spin transport across boundary, an exponential relationship low-field region. Finally we give analytical magnetoresistance formulas polycrystalline, which agree well experimental results.
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