期刊
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
卷 30, 期 -, 页码 228-232出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2014.10.009
关键词
Ferromagnetism; NiO; Exchange coupling; Amorphous
类别
资金
- Australia Research Council [DP110105338, DP140103041]
NiO films were deposited by sputtering with a relatively high oxygen partial pressure, followed by subsequent annealing in air. The as-deposited film is amorphous. The amorphous film gradually turns to crystalline structure with the increase in annealing temperature. The film annealed at 673 K shows strong ferromagnetism at room temperature, whereas, there is no room-temperature ferromagnetic ordering for the as-deposited amorphous NiO film or the film after annealed at 873 K. The ferromagnetism is due to the finite size effect and the high Curie temperature above room temperature is associated with the interaction between ferromagnetic NiO crystalline nanoclusters and antiferromagnetic amorphous matrix. (C) 2014 Elsevier Ltd. All rights reserved.
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