Structural transition and magnetic properties of evaporated Fe/Gd multilayers  

作　　者：YANG Peiyong SONG Cheng ZENG Fei PAN Feng 

机构地区：[1]Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Rare Metals》2008年第5期484-489,共6页稀有金属（英文版）

基　　金：the National Natural Science Foundation of China (No. 50871060)

摘　　要：Fe/Gd multilayers were prepared by alternate vapor deposition of pure Fe and Gd at a rate of 0.01-0.03 nm/s in an ultra-high-vacuum elec- tron-gun evaporation system. The effects of the constituent metal layer thickness on the microstructures and magnetic properties of the films were investigated by low angle X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The experimental results show that a transition from the polycrystalline to amorphous state in the Fe layers occurs with the decrease of Fe layer thickness in the Fe/Gd multilayers. The saturation magnetization of the multilayers reduces significantly with decreasing Fe layer thickness and increasing Gd layer thickness. A superparamagnetic behavior at room temperature is observed for the [Fe（0.6 nm）/Gd（4.0 nm）]15 multilayer due to the formation of discontinuous Fe layers.Fe/Gd multilayers were prepared by alternate vapor deposition of pure Fe and Gd at a rate of 0.01-0.03 nm/s in an ultra-high-vacuum elec- tron-gun evaporation system. The effects of the constituent metal layer thickness on the microstructures and magnetic properties of the films were investigated by low angle X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The experimental results show that a transition from the polycrystalline to amorphous state in the Fe layers occurs with the decrease of Fe layer thickness in the Fe/Gd multilayers. The saturation magnetization of the multilayers reduces significantly with decreasing Fe layer thickness and increasing Gd layer thickness. A superparamagnetic behavior at room temperature is observed for the [Fe（0.6 nm）/Gd（4.0 nm）]15 multilayer due to the formation of discontinuous Fe layers.

关 键 词：MULTILAYERS amorphous state MAGNETIZATION MICROSTRUCTURE thin film 

分 类 号：O484.43[理学—固体物理]