Effects of different magnetic flux densities on microstructure and magnetic properties of molecular-beam-vapor-deposited nanocrystalline Fe₆₄Ni₃₆ thin films

Abstract

The nanocrystalline Fe₆₄Ni₃₆ thin films were prepared by molecular-beam-vapor deposition under different magnetic flux densities. The microstructure and magnetic properties of thin films were examined by AFM, TEM, HRTEM and VSM. The results show that with the increase of magnetic flux densities, the changing trend of the average particle size is the same as the coercive force except 6 T. Under 6 T condition, the thin film became the mixture of bcc and fcc phases, which leads to slight increase of the coercive force. In addition, the HRTEM result shows the short-range ordered clusters (embryos) or nucleation rate of thin films increase with increasing magnetic flux densities.

Keywords

magnetic field intensity / microstructure / soft magnetic property / coercive force / crystallinity

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51425401 and 51101034) and the Fundamental Research Funds for the Central Universities (Grant Nos. N130509002, N140901001 and N140902001).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg