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Crystallographic structure and magnetic properties of polycrystalline FePd thin films on glass substrate

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Abstract

Polycrystalline FePd films with thicknesses of 30 ± 2 nm were prepared by magnetron sputtering on glass substrate. The crystallographic structure and magnetic properties as a function of substrate temperatures (T s = 400–800 °C) and chemical composition (Pd = 36–62 at.%) were further characterized. The X-ray diffractometry with synchrotron radiation source shows that L10 ordering occurred for the Fe49Pd51 films deposited at 600 °C. The ordering parameter and coercivity of the Fe49Pd51 films were revealed to increase as increasing substrate temperature. High-temperature preparation (800 °C) causes the appearance of disordered A1 phase. For the FePd films (T s = 800 °C) with different Pd concentrations, the evolution of crystallographic structure and magnetic properties is correlated. For the Fe-rich FePd films, the A1 disordered phase and soft magnetic properties were found. The highest coercivity of 4.1 kOe is obtained for the FePd films with Pd concentration of 51 at.%. With further increasing Pd content up to 62 at.%, the crystal structure changes from L10 to L12 phase which exhibits a room temperature ferromagnetism with coercivity of 0.1 kOe and saturated magnetization 782 emu/cm3.

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Acknowledgments

The authors acknowledge the National Science Council for financial support under Grant Number NSC 102-2221-E-035-010. They also acknowledge the National Synchrotron Radiation Research Center for synchrotron X-ray source and instruments.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Feng Chia University, Taichung, 407, Taiwan

    S. H. Liu, C. C. Chen, S. N. Hsiao, S. K. Chen, S. H. Su & K. F. Chiu

  2. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan

    Y. C. Chang

  3. Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan

    S. N. Hsiao

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  1. S. H. Liu
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  2. C. C. Chen
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  3. S. N. Hsiao
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Correspondence to S. N. Hsiao.

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Liu, S.H., Chen, C.C., Hsiao, S.N. et al. Crystallographic structure and magnetic properties of polycrystalline FePd thin films on glass substrate. Appl. Phys. A 119, 623–627 (2015). https://doi.org/10.1007/s00339-015-9002-x

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  • DOI: https://doi.org/10.1007/s00339-015-9002-x

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