单晶Fe3O4超薄膜的制备与磁性研究

doi:10.13228/j.boyuan.issn1005-8192.2015087

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摘要采用磁控溅射方法制备了单晶Fe3O4超薄膜，系统研究了厚度（3 ~30 nm）对薄膜磁性的影响。X射线衍射证明了Fe3O4单晶薄膜是（220）晶向，（220）衍射峰的半高全宽和晶格常数随薄膜厚度的下降而增大。磁性测量观察到了清晰的磁滞回线，饱和磁化强度达400×103 A/m。低温电阻率测量证实了薄膜在120 K温度附近发生了导体向绝缘体的Verwey转变。利用原子力显微镜观察到Fe3O4薄膜的表面粗糙度非常低，适用于纳米尺度自旋电子学器件的开发。

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	张贤楠
	刘思润
	谢娟
	张宪民

关键词 ： Fe3O4, 磁性薄膜, 单晶薄膜, 磁控溅射, Verwey转变

Abstract：Ultra- thin Fe3O4 films with single crystal structure have been prepared by magneto sputtering method, and the effect of film thickness (3~30 nm) on magnetic properties was systematically investigated X ray diffraction results show that the Fe3O4 films grow along (220) crystal direction, and the full width at half maximum for (220) peak of Fe3O4 films becomes wider and wider with the film thickness decrease Magnetization curves were clearly observed and the saturated magnetization intensity can be 400×103 A/m The measurement of resistivity at low temperature confirms the Verwey transition from conductivity to insulator at around 120 K It is seen that the surface roughness of Fe3O4 film is very low measured by atomic force microscopy, which indicate the Fe3O4 film is suitable for the development of nano- scaled spin electronic devices.

收稿日期: 2015-12-26 出版日期: 2016-04-26

基金资助:有机复合磁电阻器件的制备、界面耦合作用与自旋输运研究;材料生长的晶向调控及其应用研究;东北大学大学生创新项目

通讯作者: 张宪民 E-mail: zhangxm@atm.neu.edu.cn

引用本文:

张贤楠，刘思润，谢娟，张宪民. 单晶Fe3O4超薄膜的制备与磁性研究[J]. , 2016, 23(2): 26-29.
ZHANG Xian- nan, LIU Si- run, XIE Juan, ZHANG Xian- min. Preparation and magnetic properties of single crystal Fe3O4 ultra- thin film. , 2016, 23(2): 26-29.

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