Mechanisms of High Coercivity in Ni/NiO Composite Films by Post Annealing
来源期刊：材料科学与工程学报2007年第6期
论文作者：B.H. Liu J. Ding J.B. Yi Z. L. Zhao Mansoor Bin Abdul Jalil J.H. Yin S. Thongmee
关键词：Ni/NiO composite; post annealing; exchange coupling; enhanced coercivity;
摘 要：A coercivity as large as 2.4 kOe has been achieved in the Ni/NiO composite film after an annealing under a magnetic field of 10 kOe and an O2 partial pressure of 0.001 torr. The coercivity was attributed to the strong exchange coupling of Ni and NiO. Small grain size of Ni and NiO was observed after the post-annealing. The enhanced coercivity is probably associated with the domain wall pinning by local energy minima, the distribution of Ni and NiO, and the domain structure in the interface of Ni/NiO generated under the presence of the magnetic field during the post-annealing.
B.H. Liu1，J. Ding1，J.B. Yi1，Z. L. Zhao1，Mansoor Bin Abdul Jalil2，J.H. Yin1，S. Thongmee1
(1.Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore;
2.Department of Electrical & Computer Engineering, National University of Singapore, 119260, Singapore)
摘要:A coercivity as large as 2.4 kOe has been achieved in the Ni/NiO composite film after an annealing under a magnetic field of 10 kOe and an O2 partial pressure of 0.001 torr. The coercivity was attributed to the strong exchange coupling of Ni and NiO. Small grain size of Ni and NiO was observed after the post-annealing. The enhanced coercivity is probably associated with the domain wall pinning by local energy minima, the distribution of Ni and NiO, and the domain structure in the interface of Ni/NiO generated under the presence of the magnetic field during the post-annealing.
关键词:Ni/NiO composite; post annealing; exchange coupling; enhanced coercivity;
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