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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Effect of particle size on magnetic and electric transport properties of La0.67Sr0.33MnO3 coatings
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Effect of particle size on magnetic and electric transport properties of La0.67Sr0.33MnO3 coatings

机译：粒径对La0.67Sr0.33MnO3涂层的磁和电输运性能的影响

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摘要

A systematic study of polycrystalline La0.67Sr0.33MnO3 (LSMO) manganite coatings has been undertaken to analyse the effect of various particle sizes on the magnetic and electric transport properties. In order to acquire a series of samples with different particle sizes, the samples were prepared by a sol-gel method and were subjected to annealing at four different temperatures. With decreasing particle sizes, the magnetization decreases while the coercivity increases, which is attributed to the magnetically disordered surface layer. More attractively, the electrical transport properties can be systematically manipulated by particle sizes and so can the low field magnetoresistance (LFMR) values. Emphasis is placed on how the particle size affects the temperature dependence of resistivity, and three conduction models are explored to describe the transport behaviours in three temperature regions. A minimum resistivity is observed in the low temperature region in the presence and absence of a magnetic field, which can be mainly explained as due to the intergranular spin polarized tunneling (ISPT) through the grain boundaries (GBs) in polycrystalline materials.
机译：对多晶La0.67Sr0.33MnO3（LSMO）锰酸盐涂层进行了系统研究，以分析各种粒径对磁和电传输性能的影响。为了获得一系列具有不同粒径的样品，通过溶胶-凝胶法制备样品，并在四个不同温度下进行退火。随着颗粒尺寸的减小，磁化强度降低，而矫顽力增加，这归因于磁性无序的表面层。更具吸引力的是，可以通过粒度系统地控制电传输特性，因此低场磁阻（LFMR）值也可以。重点放在粒度如何影响电阻率的温度依赖性上，并探索了三种传导模型来描述在三个温度区域中的传输行为。在存在和不存在磁场的情况下，在低温区域观察到最小电阻率，这可以主要解释为由于穿过多晶材料中晶界（GB）的晶间自旋极化隧穿（ISPT）。

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