Exchange bias on polycrystalline BiFeO3/CO2Fe(Al0.5Si0.5) heterostructures

作     者：Shi-Zhe Wu Yong Wu Shao-Qian Yin Xiao-Guang Xu Jun Miao Yong Jiang 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2017年第36卷第1期

页      面：32-36页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Basic Research Program of China (Nos. 2012CB932702 and 2015CB921502) the National Natural Science Foundation of China (Nos. 11174031, 51371024, 51325101, 51271020, and 51471029) 

主　　题：Exchange bias BiFeO3 Polycrystalline Domain walls 

摘      要：Polycrystalline antiferromagnetic BiFeO(BFO)thin films were grown on Si/Si O/Ti/Pt(111) substrates by pulsed laser deposition and then ferromagnetic films CoFe(AlSi)(CFAS) by magnetron sputtering. After fabrication, the films were vacuum-annealed under a 0.1-T magnetic field at different temperatures from 150 to 500 °*** exchange bias field can be tuned by the annealing temperature for the heterostructures, and the electric domain size can be controlled by the crystal grain size. A large exchange bias of about 5*10T is observed in one of the samples. It can be speculated that the crystal grain sizes are the key element in determining the exchange bias and coercivity of the films annealed at the temperature of higher than Neel temperature(T N) of BFO. Furthermore, it is possible to extend spin theories from single-crystal BFO system to polycrystalline BFO system.