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Open AccessArticle

Surface Magnetostriction of FeCoB Amorphous Ribbons Analyzed Using Magneto-Optical Kerr Microscopy

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Department of Physics, Faculty of Electrical Engineering and Computer Science, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
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Research Center of Liquid Metal Physics, Boris Yeltsin Ural Federal University, Ekaterinburg 620002, Russia
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Department of Applied Mechanics, Faculty of Mechanical Engineering, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
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Center for Advanced Innovation Technologies, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
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CEITEC IPM, Institute of Physics of Materials, AS CR, Zizkova 22, 616 00 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 257; https://doi.org/10.3390/ma13020257
Received: 6 December 2019 / Revised: 27 December 2019 / Accepted: 28 December 2019 / Published: 7 January 2020
(This article belongs to the Special Issue Magnetoelastic Materials)
Surface sensitive magneto-optical Kerr microscopy completed with the special self-made sample holder is used for studying the magneto-elastic behaviour in the surface of the as-quenched amorphous Fe73Co12B15 alloy. The 10, 5, and 3 mm wide and approximately 34 μm thick ribbons were prepared by the conventional planar flow casting process. The experimental setup allows for a simultaneous application of an external magnetic field in the directions parallel and perpendicular to the ribbon axis and of compression stress from one side of the sample, resulting in tensile stress in opposite side. The distributions of tensile stresses in the measured surface were modelled by the finite element method. The observed changes of the magnetic domains and hysteresis loop anisotropy field under applied stress are evaluated using the Becker–Kersten method. This resulted in the determination of the local surface magnetostrictive coefficient from an area of about 200 μm in diameter. The obtained values ranged between 37–60 ppm and were well comparable with the bulk value presented in the literature. View Full-Text
Keywords: magneto-optical Kerr microscopy; domain imaging; magneto-elastic effect; finite element method; surface magneostrictive coefficient magneto-optical Kerr microscopy; domain imaging; magneto-elastic effect; finite element method; surface magneostrictive coefficient
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MDPI and ACS Style

Hrabovská, K.; Životský, O.; Rojíček, J.; Fusek, M.; Mareš, V.; Jirásková, Y. Surface Magnetostriction of FeCoB Amorphous Ribbons Analyzed Using Magneto-Optical Kerr Microscopy. Materials 2020, 13, 257.

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