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The Effect of Pd Doping and Chemical Pd-plating on the Electric-magneto Transport Properties in Lcsmo System

Author: HuHaiZuo
Tutor: XiongCaoShui；XiongYongHong
School: Huazhong University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Manganese-based perovskite oxides Solid-state reaction Electroless plating Intrinsic magnetoresistance Electromagnetic transport behavior Grain boundary effect Scattering Phase separation
CLC: O482.5
Type: Master's thesis
Year: 2009
Downloads: 5
Quote: 0
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Abstract


The Abstract successfully prepared by solid state reaction method in the La 0.7 Ca 0.2 < / sub> Sr 0.1 of MnO 3 ( LCSMO ) and Pd composite system , the systematic study of the structure of the system , and the electromagnetic characteristics , and magneto- resistive (MR) characteristics and of its mechanism . In addition, the article also try to use chemical plating method to prepare LCSMO / Pd composite system , I hope to get some meaningful results by comparing the giant magnetoresistive materials obtained by these two methods . The text is divided into five chapters : The first chapter introduces the manganese-based perovskite oxides related theory , research progress and application of the status quo , based on the purpose and significance of the thesis topics . The second chapter describes the method of sample preparation , including the solid state reaction method and chemical plating method , and ceramic powders chemical plating pre-treatment process, research status and progress of the Introduction . Chapter mainly manganese-based perovskite oxide La 0.7 < / sub > Ca 0.2 < / sub> the Sr 0.1 < / sub > of MnO 3 < / sub> is matrix by the solid state reaction method introduced Pd metal the LCSMO the mother grain boundaries . The PD added did not change the Curie temperature Tc of the system , but which greatly reduces the resistivity of the metal semiconductor transition temperature Tp to the high temperature drift . Ferromagnetic (FM) metal area resistivity (ρ) satisfies the empirical formula , ρ = ρ0 ρ2.5T2.5 ρ7.5T7.5, reaction in the region of the conduction mechanism and electronic electronics, electrons and phonons , electronic and magnetic scattering . Semiconductor region in the paramagnetic (PM) , resistivity data with small polaron jump to move the model are in good agreement . For all samples , ρ-T curve with the origin at the grain boundaries at the spin - polarized tunneling wear and thermally activated phase separation model agrees very well . Further, the magnetic resistance at room temperature to obtain a large enhancement 4 < / SUP > 0 % and 12 % of the magnetic resistance Δρ is / ρ ( H = 0 ) were obtained at 20 kOe and 3 kOe magnetic field . MR-H curve and the anastomosis of the Brillouin function implies the behavior of the system of the MR characteristics of the intrinsic CMR material . The fourth chapter analyzes the purpose as well as the feasibility of electroless plating Pd topics initially explored the electroless plating process prepared LCSMO / Pd composite system . Chapter summarize the full text .

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Magnetic properties
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