Enhancement of crystallization in FeMoCuB metallic glass by deposition of Co layer

• This paper is focused on a controlling of the crystallization process in an amorphous metal by deposition of a magnetic layer.
• The evident impact of a cobalt layer on the amorphous Fe76Mo8Cu1B15 has been observed.
• Boosting of crystallization is driven by a magnetic interaction of an amorphous metal with the ferromagnetic layer.
• Whole volume of the 20 μm ribbon is affected by 30 nm of Co.

This study aims at a crystallization process of metallic glass ribbon. An impact of the magnetic interaction upon the crystallization process is reported. Amorphous ribbon composed of Fe76 Mo8 Cu1 B15 has been covered by sputtered Co layer in the range 0–100 nm. Deposited Co layers were investigated by magneto-optical Kerr measurements which confirm their ferromagnetic character. The amorphous ribbons with and without Co cover layer were thermally treated under the elevated temperature. Afterwards, the degree of crystallization was determined using transmission Mössbauer spectroscopy and conversion electron Mössbauer spectroscopy measurements at room temperature. Sputtered cobalt layer significantly boosts development of nanograins in the whole amorphous matrix. It was revealed that the crystallization enhancement was caused by magnetic impingement of ferromagnetic Co layer with the thickness higher than 30 nm.

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