纳米晶铜铁氧体薄膜的超顺磁性
Superparamagnetism in Nanocrystalline Copper Ferrite Thin Films
摘要：
射频溅射铜铁氧体薄膜中含有纳米晶粒。在这些薄膜中，即使在高磁场中，磁化强度也不饱和。这种高场磁化率的现象归因于薄膜中的缺陷和/或超顺磁性颗粒。一个简单的模型来描述所观察到的高场磁化这些薄膜的行为。该模型被发现适合所有研究的电影的高场部分。还试图解释的亚铁磁贡献的基础上报告的交换常数的温度变化。
英文摘要：
The rf sputtered copper ferrite films contain nanocrystalline grains. In these films, the magnetization does not saturate even in high magnetic fields. This phenomenon of high field susceptibility is attributed to the defects and/or superparamagnetic grains in the films. A simple model is developed to describe the observed high field magnetization behavior of these films. The model is found to fit well to the high field part for all the studied films. An attempt is also made to explain the temperature variation of the ferrimagnetic contribution on the basis of reported exchange constants.
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