期刊
JOURNAL OF MATERIALS RESEARCH
卷 29, 期 11, 页码 1237-1247出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2014.108
关键词
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资金
- National Science Council
- Taiwan International Graduate Program, Academia Sinica, Taiwan, Republic of China
A systematic experimental study on the exchange bias (EB) effect in a ferromagnet/antiferromagnet bilayer system is performed both in the static (dc) and dynamic (high frequency) timescale to clarify the effects of temperature and antiferromagnetic (AFM) layer thickness on the system's stability and magnetic properties. Our system consists of NiFe/IrMn. Both parallel and perpendicular domain walls are suggested to explain the static EB and coercivity behaviors. In the microwave region, peaks, which can only be suppressed at high temperatures with strong external fields, were observed in the AFM thickness dependencies of the dynamic effective field and resonance frequency. The temperature dependence of both static and dynamic parameters suggests different values of Neel temperatures. The dynamic results show a rotatable anisotropy contribution, which has a peak value at the blocking temperature and vanishes at the dynamic Neel temperature.
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