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退火温度对纳米Co0.8Mg0.2Fe2O4/SiO2复合薄膜结构和磁性的影响
作者:刘宇 刘梅 张玉梅 李季 李海波 
单位:吉林师范大学 凝聚态物理与材料科学研究所 吉林 四平 136000 
关键词:铁氧体薄膜 纳米复合材料 结构 磁性 退火 
分类号:O482.5
出版年,卷(期):页码:2011,39(6):125-129
DOI:
摘要:

采用溶胶-凝胶旋涂法制备纳米Co0.8Mg0.2Fe2O4/SiO2复合薄膜。用X射线衍射仪、原子力显微镜及振动样品磁强计分析复合薄膜的结构、表面形貌和磁性,研究退火温度对复合薄膜结构和磁性的影响。结果表明:经800 ℃退火处理的样品中已形成Co0.8Mg0.2Fe2O4晶相;随着退火温度的提高,Co0.8Mg0.2Fe2O4晶粒尺寸变大,晶格常数减小;随着Co0.8Mg0.2Fe2O4晶粒尺寸的增大,样品的磁化强度和剩磁比变大,矫顽力先增大后减小,经1 100 ℃退火处理样品的垂直膜面矫顽力达到296.1 kA/m;样品存在较明显的垂直磁各向异性。

Co0.8Mg0.2Fe2O4/SiO2 nanocomposite films were prepared by the sol-gel method. Structure, morphology and magnetic properties of the nanocomposite films were characterized by the X-ray diffraction, atomic force microscopy and vibrating sample magnetometry (VSM), and effects of annealing temperature on structure and magnetic properties of the nanocomposite films were studied. Results show that the sample exhibits a Co0.8Mg0.2Fe2O4 spinel structure after being annealed at 800 ℃. With the increasing of the annealing temperature, the grain size of Co0.8Mg0.2Fe2O4 in the nanocomposite films increases, while the lattice constant decreases. The VSM results show that magnetization and remanence ratio (Mr/Ms) increases with the increasing of the grain size of Co0.8Mg0.2Fe2O4, while the coercivity of samples tends to increase first, and then decrease. Perpendicular coercivity of the sample annealed at 1 100 ℃ reaches 296.1 kA/m. The films possess an obvious perpendicular magnetic anisotropy.

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基金项目:
吉林省科技发展计划(20090144)资助项目
作者简介:
硕士研究生
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参考文献:

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