Anomalous positive exchange bias in nanostructured FeMn/Co/FeMn networks

作者：Jiang Changjun; Xue Desheng^*; Fan Xiaolong; Guo Dangwei; Liu Qingfang

来源：Nanotechnology, 2007, 18(33): 335703.

DOI：10.1088/0957-4484/18/33/335703

FeMn/Co/FeMn multilayers are sputtered onto porous alumina templates and silicon, respectively. The FeMn/Co/FeMn multilayer on the porous alumina templates forms an interconnected network nanostructure, while the FeMn/Co/FeMn multilayer on the silicon substrate forms a continuous film. The SQUID testing results show that the exchange bias (HE) and coercivity (H-c) of the FeMn/Co/FeMn multilayer on the porous alumina templates strongly depend on the temperature. A positive exchange bias loops shift is observed at 250 K under field-cooled conditions. However, this is not found in the FeMn/Co/FeMn multilayer on silicon for the same layer thickness. We attribute the positive exchange bias loops shift of the network nanostructured FeMn/Co/FeMn multilayer to the decreased exchange coupling due to the existence of the holes in the interconnected nanostructure.

• 出版日期2007-8-22
• 单位兰州大学