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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Low-field magnetoresistance in La0.7Sr0.3MnO3/Ta2O5 composites
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Low-field magnetoresistance in La0.7Sr0.3MnO3/Ta2O5 composites

机译:La0.7Sr0.3MnO3 / Ta2O5复合材料的低场磁阻

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摘要

Two-phase composites La0.7Sr0.3MnO3/Ta2O5 are synthesized and their magnetization and low-field magnetoresistance (LFMR) characteristics are investigated. It is found that a small amount of Ta ions enter into LSMO grains near the grain surface region, resulting in the reduction of the cell volume, and consequently, an extra reduction of the saturate magnetization. The paramagnetism-to-ferromagnetism transition temperature, T-C, does not show significant change. The LFMR enhancement is observed over a wide range of temperature from 50 to 350 K when the second phase material (Ta2O5) is introduced. The magnetic disorder caused by the secondary phase at grain boundaries and the Ta doping effect on the surface of LSMO grains are believed to contribute to the enhanced MR.
机译:合成了两相复合材料La0.7Sr0.3MnO3 / Ta2O5,研究了它们的磁化和低场磁阻(LFMR)特性。发现少量的Ta离子进入晶粒表面区域附近的LSMO晶粒中,导致晶胞体积的减小,因此饱和磁化强度的进一步减小。顺磁性到铁磁性的转变温度T-C没有显示出明显的变化。当引入第二相材料(Ta2O5)时,在50至350 K的宽温度范围内观察到LFMR增强。据信,由晶界处的第二相和LSMO晶粒表面上的Ta掺杂效应引起的磁异常有助于增强MR。

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