退火温度对Fe_3O_4纳米颗粒输运性质的影响  

Effect of Annealing Temperature on the Transport Property of Fe_3O_4 Nanoparticles

作　　者：陈静[1] 米菽 李圆圆[1] 陈子瑜[1] 

机构地区：[1]北京航空航天大学物理系微纳测控与低维物理教育部重点实验室,北京100191

出　　处：《信息记录材料》2016年第5期178-181,共4页Information Recording Materials

摘　　要：本文利用多元醇法制备了Fe_3O_4纳米颗粒,并对样品进行了不同温度的退火处理,研究了退火温度对其磁化与反磁化行为以及输运性质的影响。研究结果表明,其饱和磁化强度随退火温度的升高而增大。在高场区域,退火温度越高,磁电阻越小;但在低场区域,磁电阻与退火温度的关系表现出相反的行为。对这些结果的深入研究有利于理解与输运性质相关的物理机制,对半金属纳米材料在自旋电子器件中的应用具有参考价值。Fe3O4 nanoparticles were synthesizedusingpolyol method, and then processed by vacuum annealing in the different temperature. The effect of the annealed temperatureon the magnetization and reversed magnetization behavior and the transport propertyhas beenstudied. The results show that saturation magnetization enhancewith increase ofannealing temperature. In addition, asannealing temperature increases, the magnetoresistanceisdecreasesin the high-field region. But in lower field, thehigher annealing temperature contributes to the enlargement of magnetoresistance. This work will helpful to studythe magnetic transportmechanismandwill play a guiding role in the half-metallic nanoscale materials in spintronic devices.

关 键 词：纳米颗粒 退火温度 磁化与反磁化 输运性质 

分 类 号：TP204[自动化与计算机技术—检测技术与自动化装置]