Stress and/or field annealing of Fe73.5Cu1Nb3Si15.5B7 amorphous ribbon

Abstract The magnetic anisotropy induced by stress (500 MPa) and/or axial magnetic field (750 A/m) annealing in Fe73.5Cu1Nb3Si15.5B7 amorphous alloy has been investigated. The thermal treatments were carried out using the current annealing technique (current densities ranging from 30 to 47 A / mm 2 , duration of 120 s). A uniaxial in-plane magnetic anisotropy was induced in the samples as a result of these thermal treatments. The easy axis of this induced anisotropy at current densities 40 A/mm2 the easy axis is parallel to the axis of the ribbon for the three types of treatment. The dependence of this induced anisotropy on the current density has a maximum (1000 J / m 3 ) around 40 A / mm 2 , which we relate to the first stages of the crystallization process followed by a minimum at around 47 A / mm 2 . Similar dependence was obtained for the coercivity of the samples after these thermal treatments. A coercivity of about 1 A/m has been achieved after magnetic FA.