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Magnetic properties and nanocrystallization process in Co–(Me)–Si–B amorphous ribbons

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Abstract

Magnetic properties of amorphous Co70Fe3Mn3.5Mo1.5Si11B11 and Co73Fe1Mn3Mo1Si13B9 alloys, manufactured in the form of ribbons by rapid cooling from the melt, were studied using vibrating sample magnetometer and thermo-magnetic methods. The Curie point (648 K and 683 K), coercive force (180 A/m and 40 A/m), and saturation magnetization (83 Am2/kg and 85 Am2/kg) were defined. The nanocrystallization process of the amorphous Co70Fe3Mo1.5Mn3.5Si11B11 and Co73Fe1Mo1Mn3Si13B9 alloys were studied by DTA, X-ray diffraction, and using the thermo-magnetic method in the high magnetic field 800 kA/m. The crystallization onset temperatures of the alloys were defined as about 787 K and 729 K, respectively. The effect of a magnetic field on the crystallization behavior, revealed in a notable crystallization onset temperature decrease, was observed. The structure evolution induced by the isothermal annealing at temperature 753 K was studied and the X-ray diffraction structure analyses revealed nanocrystallization with hcp-Co, fcc-Co, and Co3B phases. FESEM studies revealed a nanoscale and flower-like structure on the ribbon surface after annealing at 753 K.

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Acknowledgements

We are grateful to our colleagues at the G.V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine for their assistance in obtaining samples under investigation and to Andriy Horyn, PhD, Senior Researcher, and Chief of Inter-faculty Laboratory of Differential Thermal Analysis of Ivan Franko National University of Lviv for the assistance in the DTA study. The authors would like to acknowledge the University of Wurzburg for providing the equipment for the FESEM investigation.

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Correspondence to Yulia Nykyruy.

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Nykyruy, Y., Mudry, S., Kulyk, Y. et al. Magnetic properties and nanocrystallization process in Co–(Me)–Si–B amorphous ribbons. Appl Nanosci 13, 5239–5249 (2023). https://doi.org/10.1007/s13204-022-02746-6

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  • DOI: https://doi.org/10.1007/s13204-022-02746-6

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