Exchange bias on polycrystalline BiFeO3/Co2Fe(Al0.5Si0.5) heterostructures
来源期刊：Rare Metals2017年第1期
论文作者：Shi-Zhe Wu Yong Wu Shao-Qian Yin Xiao-Guang Xu Jun Miao Yong Jiang
文章页码：32 - 36
摘 要：Polycrystalline antiferromagnetic BiFeO3（BFO）thin films were grown on Si/Si O2/Ti/Pt（111） substrates by pulsed laser deposition and then ferromagnetic films Co2Fe(Al0.5Si0.5)（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 °C.The 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*10-3T 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.
Shi-Zhe Wu，Yong Wu，Shao-Qian Yin，Xiao-Guang Xu，Jun Miao，Yong Jiang
School of Materials Science and Engineering, University of Science and Technology Beijing
摘 要：Polycrystalline antiferromagnetic BiFeO3（BFO）thin films were grown on Si/Si O2/Ti/Pt（111） substrates by pulsed laser deposition and then ferromagnetic films Co2Fe(Al0.5Si0.5)（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 °C.The 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*10-3T 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.
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