Purpose: The paper presents and reviews the research results of soft magnetic composites consisting nanocrystalline powders obtained by soaking and high energetic milling of amorphous ribbons of metallic glasses Fe78Si9B13 and Fe73. 5Cu1Nb3Si13. 5B9.

Design/methodology/approach: Amorphous Fe78Si9B13 and Fe73. 5Cu1Nb3Si13. 5B9 ribbons were milled in a high energy ball mill (8000 SPEX CertiPrep Mixer/Mill) with a ball-to-sample weight ratio of 5: 1. The obtained metallic powders were sieved to a particle mean diameter 200÷ 500 µm, 75÷ 200 µm and 25÷ 75 µm, and then annealed in an argon atmosphere to generate the nanocrystalline state. The powders particles were mixed and consolidated with polymer to obtain composites in the form toroidal cores. Observations of the structure of powders and composites were made on the Opton DSM-940 scanning electron microscope and electron transmitting microscope JEOL JEM 200CX and X-ray analysis. The X-ray tests were realized with the use of the XRD 7 SEIFERT-FPM diffractometer. Findings: The analysis of the magnetic properties test results of the powders obtained in the high-energy ball of milling process, and the composites manufactured from these powders proved that the process causes significant decrease in the magnetic properties in relation to ribbons. The structure and magnetic properties of this material may be improved by means of a proper choice of parameters of this process as well as the final thermal treatment and first of all by decrease of demagnetization effect.