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首页> 外文期刊>Reviews on Advanced Materials Science >Surface Spin Disorder and Exchange Bias in La0.7Ca0.3MnO3 Nanopaticles Synthesised by Mechanochemical Processing
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Surface Spin Disorder and Exchange Bias in La0.7Ca0.3MnO3 Nanopaticles Synthesised by Mechanochemical Processing

机译：机械化学合成La 0.7 Ca 0.3 MnO 3 纳米颗粒的表面自旋失序和交换偏压

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摘要

Nanoparticles of La0.7Ca0.3MnO3 have been synthesised via the chemical reaction 0.7LaCl3 + 0.3CaCl2 + MnCl2 + 2.35Na2CO3 + 0.325O2 --> La0.7Ca0.3MnO3 + 4.7NaCl + 2.35CO2 effected by high-energy ball milling and subsequent heat treatment. Single-phase La0.7Ca0.3MnO3 particles having crystallite sizes ranging between 24 nm and 1 μm were obtained after removing the NaCl by-product phase by washing. Magnetic measurements showed that the spontaneous magnetisation decreased with deceasing crystallite size; that the coercivity increased with decreasing temperature; and that below about 50 K field-cooled hysteresis loops for the smallest particles were shifted towards the negative field. These observations are discussed in terms of a model in which it is assumed that each crystallite consists of a ferromagnetic core and a spin-glass shell that are exchange-coupled.
机译：通过化学反应0.7LaCl 3 + 0.3CaCl <1合成了La 0.7 Ca 0.3 MnO 3 SUB> 2 + MnCl 2 + 2.35Na 2 CO 3 + 0.325O 2 - > La 0.7 Ca 0.3 MnO 3 + 4.7NaCl + 2.35CO 2 随后的热处理。去除NaCl副产物后，获得了微晶尺寸为24 nm至1μm的单相La 0.7 Ca 0.3 MnO 3 颗粒相洗。磁测量表明，自发磁化强度随着微晶尺寸的减小而减小。矫顽力随温度降低而增加;而对于最小颗粒，低于约50 K的场冷磁滞回线则朝负场移动。根据模型讨论了这些观察结果，在该模型中，假定每个微晶由交换耦合的铁磁核和自旋玻璃壳组成。

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