摘要
采用溶胶-凝胶法制备La2/3Ca1/3MnO3纳米级磁性颗粒和TiO2胶体,按一定比例制成La2/3Ca1/3MnO3/xTiO2(其中x取0、0.1、0.2、0.3、0.4)复合磁电阻材料。用XRD谱确定样品的晶体结构。采用振动样品磁强计测量了样品的磁滞回线和场冷却磁化强度随温度的变化行为;采用标准四引线法测量样品在恒定磁场下的电阻率随温度的变化。实验测量结果表明体系的磁化强度、剩磁、矫顽力随TiO2含量的变化具有相似的规律,具有室温的居里温度;并且当磁场强度小于0.4T时,磁电阻与磁场平方成正比关系;当大于0.6T时,磁电阻与磁场成线性关系。
Sol-gel method was used to produce La2/3Ca1/3MnO3 nanometer magnetic particle and TiO2 colloid and synthetize the composite magnetoresistance materials La2/3Ca1/3MnO3/xTiO2（x=0,0.1,0.2,0.3,0.4）.The crystal structure of the sample hysteresis loop,change of field-cooled magnetization versus temperature and change of resistivity with temperature in a constant magnetic field were measured by using XRD,vibrating sample magnetometer and standard four-probe method,respectively.The results show that TiO2 content has similar effects on magnetization,remanence and coercivity of the samples.Also we an come to the conclusion that when the magnetic field intensity is less than 0.4T,the magnetoresistance and the square of the magnetic field have a proportional relationship;when the magnetic field intensity is larger than 0.6T,the magnetoresistance is linear with the magnetic field.
出处
《稀土》
EI
CAS
CSCD
北大核心
2012年第5期54-58,共5页
Chinese Rare Earths
基金
福建农林大学机电工程培育团队基金(pytd12002)
关键词
溶胶-凝胶法
复合磁性材料
庞磁电阻
磁电特性
sol-gel
composite magnetic materials
colossal magnetoresistance
magnetic and electrical properties
