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Temperature dependence of static and dynamic magnetic properties in NiFe/IrMn bilayer system

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Abstract

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 Néel temperatures. The dynamic results show a rotatable anisotropy contribution, which has a peak value at the blocking temperature and vanishes at the dynamic Néel temperature.

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ACKNOWLEDGMENTS

This work was supported by the National Science Council and the Taiwan International Graduate Program, Academia Sinica, Taiwan, Republic of China. The technical help of Christine Lu is appreciated.

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Authors and Affiliations

  1. Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan

    Faris Basheer Abdulahad & Shang-Fan Lee

  2. Nano Science and Technology Program, TIGP, Academia Sinica, Taipei, 11529, Taiwan

    Faris Basheer Abdulahad & Shang-Fan Lee

  3. Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300, Taiwan

    Faris Basheer Abdulahad

  4. Department of Information and Telecommunications Engineering, Ming Chuan University, Taipei, 111, Taiwan

    Dung-Shing Hung

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  1. Faris Basheer Abdulahad
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Abdulahad, F.B., Hung, DS. & Lee, SF. Temperature dependence of static and dynamic magnetic properties in NiFe/IrMn bilayer system. Journal of Materials Research 29, 1237–1247 (2014). https://doi.org/10.1557/jmr.2014.108

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