Laser assisted crystallization of ferromagnetic amorphous ribbons: A multimodal characterization and thermal model study

Shravana Katakam, Arun Devaraj, Mark Bowden, S. Santhanakrishnan, Casey Smith, R. V. Ramanujan, Thevuthasan Suntharampillai, Rajarshi Banerjee, Narendra B. Dahotre

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    Abstract

    This paper focuses on laser-based de-vitrification of amorphous soft magnetic Fe-Si-B ribbons and its consequent influence on the magnetic properties. Laser processing resulted in a finer scale of crystallites due to rapid heating and cooling during laser annealing compared to conventional furnace annealing process. A significant increase in saturation magnetization is observed for laser-annealed ribbons compared to both as-received and furnace annealed samples coupled with an increase in coercivity compared to the as received samples. The combined effect of thermal histories and stresses developed during laser annealing results in the formation of nano-crystalline phase along the laser track. The phase evolution is studied by micro-XRD and TEM analysis. Solute partitioning and compositional variation within the phases are obtained by Local Electrode Atom probe analysis. The evolution of microstructure is rationalized using a Finite Element based heat transfer multi-physics model.

    Original languageEnglish
    Article number184901
    JournalJournal of Applied Physics
    Volume114
    Issue number18
    DOIs
    Publication statusPublished - 14 Nov 2013

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Katakam, S., Devaraj, A., Bowden, M., Santhanakrishnan, S., Smith, C., Ramanujan, R. V., Suntharampillai, T., Banerjee, R., & Dahotre, N. B. (2013). Laser assisted crystallization of ferromagnetic amorphous ribbons: A multimodal characterization and thermal model study. Journal of Applied Physics, 114(18), [184901]. https://doi.org/10.1063/1.4829279