Pulsed interference laser heating  of amorphous FeSiB ribbons

Jan Kusinski; Olaf Czyz; Agnieszka Radziszewska; Tomasz Stobiecki; Roman Ostrowski; Marek Strzelec; Malgorzata Kac

doi:10.1117/12.2521182

4 December 2018 Pulsed interference laser heating of amorphous FeSiB ribbons

Jan Kusinski, Olaf Czyz, Agnieszka Radziszewska, Tomasz Stobiecki, Roman Ostrowski, Marek Strzelec, Malgorzata Kac

Proceedings Volume 10974, Laser Technology 2018: Progress and Applications of Lasers; 109740Y (2018) https://doi.org/10.1117/12.2521182
Event: Thirteenth Symposium on Laser Technology, 2018, Jastarnia, Poland

Abstract

The influence of Q-switched pulsed Nd:YAG laser interference heating parameters on microstructure and magnetic properties of amorphous Fe₈₀Si₁₁B₉ alloy was examined. Different laser pulse energy and a variable number of consecutive pulses were used. Results were compared with amorphous and conventionally annealed ribbons. Microstructural analysis, using light, scanning and transmission electron microscopy, was complemented by results of AFM and Mössbauer spectroscopy, as well as measurements of magnetic properties (vibrating sample magnetometer). Periodically distributed crystallized micro-areas, ~10 μm in diameter, in the amorphous matrix were produced by the laser treatment. Laser heating produced nanograin crystalline structure in the amorphous matrix. While after the conventional annealing – dendritic structure was observed. The magnetic hysteresis loop measurement showed that laser heating had no significant influence on soft magnetic properties. Magnetization measurements showed that the as-cast ribbon and laser light irradiated samples are magnetically soft materials. The results lead to the conclusion that the dots corresponding to the laser modified regions exhibit a perpendicular magnetic anisotropy. Magnetic force microscopy showed expanded magnetic structure in laser heated microareas, while the amorphous matrix did not give any magnetic signal.

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Jan Kusinski, Olaf Czyz, Agnieszka Radziszewska, Tomasz Stobiecki, Roman Ostrowski, Marek Strzelec, and Malgorzata Kac "Pulsed interference laser heating of amorphous FeSiB ribbons ", Proc. SPIE 10974, Laser Technology 2018: Progress and Applications of Lasers, 109740Y (4 December 2018); https://doi.org/10.1117/12.2521182

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KEYWORDS

Magnetism

Crystals

Pulsed laser operation

Laser crystals

Transmission electron microscopy

Annealing

Diffraction

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