Abstract
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.
Highlights
Magnetostriction is a physical property of magnetic materials changing their shape in dependence on an applied magnetic field
In order to find the local surface saturation coefficient of magnetostriction, the sample holder described below was implemented into the magneto-optical Kerr microscopy equipment (Figure 2)
The magnitude the magnetic field was decreased biaxial tensile in the measured surface was modelled by theof finite element method (FEM)
Summary
Magnetostriction is a physical property of magnetic materials changing their shape in dependence on an applied magnetic field. One of the indirect methods is the Becker–Kersten (BK) method [6], which is based on the measurements of the hysteresis loop in dependence on the applied external stress and provides accurate results for the volume coefficient of magnetostriction, especially for the magnetically soft amorphous and nanocrystalline ribbons prepared using planar flow casting [7,8] This technique could be used for new Fe-based metallic glasses prepared by 3D print technology [9]. To simultaneously observe the changes in the magnetic domain structure and hysteresis loops under applied stress, the special sample holder was constructed and located within the Kerr microscope as a common experimental setup This has enabled to analyse both the positive and negative surface saturation magnetostriction values of the ribbon-type samples
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