Beata Butvinova

The effect of Co on the magnetic properties of short annealed (annealing time 5 minutes at Ar atmosphere) nanocrystalline alloy (Fe1−xCox)83Sn3B12P2 with x = 0

The method of planar flow casting has been used for preparation of single-, bi- and tri-layered ribbons of the two different or the same composition to attain multi-layered ribbons suitable for an application. Prepared bilayer was composed of positively and negatively magnetostrictive layers Fe_77.5Si_7.5B₁₅/Co_72.5Si_12.5B_15. Other aim was to suppress potentially undesired surface effects of differences between ribbon surfaces and volume. We prepared the ribbons with composition Co₄₇Fe₂₁Mo_6.5B₂₁Si_4.5 as single layer and trilayer with the thickness ratio more than 3:1. Structural, chemical and magnetic properties in amorphous (as-cast) and crystalline state were investigated. The composition was chosen to obtain low saturation magnetostriction. Nanocrystallization improved soft magnetic properties namely for trilayer. Work proved that reduction of large surface/volume ratio enables to reduce undesired effects of shrinking surfaces that squeeze the small volume of a single ribbon more efficiently.