Abstract
Amorphous Fe73B7Si16Nb3Cu1 ribbon was crystallized rapidly by electric current heating under simultaneously applied tensile stress along the ribbon axis. As a result, strong transverse magnetic anisotropy was induced in the ribbon. Dynamic magnetic properties of the ribbons rapidly heated either under the tensile stress or without tensile stress were measured using toroidal cores. Optimal electric current heating regime that provides maximum improvement of the initial magnetic permeability and core loss was determined. Tensile stress increase from 0 to 180 MPa was shown to result in the decrease of the initial magnetic permeability down to 400 and core loss at frequencies from 0.4 to 200 kHz. Comparative analysis of magnetic properties of the cut core (with non-magnetic gap) and the cores heated under tensile stress was carried out. The magnetic properties of the latter cores are advantageous for manufacturing the reactors and linear chokes of switch-mode power supplies.
Highlights
IntroductionSoft magnetic FINEMET trademark nanocrystalline alloys [1] are widely used in magnetic cores of various inductive components (transformers and chokes)
At present, soft magnetic FINEMET trademark nanocrystalline alloys [1] are widely used in magnetic cores of various inductive components
The aims of the present work were to investigate the influence of rapid heating and rapid heating under tensile stress on the magnetic properties of Fe73B7Si16Nb3Cu1 alloy, to investigate the magnetic properties of cores made of a ribbon heated under tensile stress and cut cores made of Fe73B7Si16Nb3Cu1 alloy crystallized by conventional isothermal annealing, and to determine the main advantages of the gapless magnetic cores with induced strong transverse magnetic anisotropy
Summary
Soft magnetic FINEMET trademark nanocrystalline alloys [1] are widely used in magnetic cores of various inductive components (transformers and chokes). Nanocrystalline volume fraction in these alloys is about 80%, and their size is approximately 10 to 12 nm [1,2,3,4,5] In these alloys and similar ones, a hysteresis loop shape can be changed by inducing uniaxial magnetic anisotropy by annealing in magnetic field [6,7,8] and/or heating under tensile stress [9,10,11,12]. To the best of our knowledge, there are no studies that demonstrate the
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