Materials with so-called soft magnetic properties are an important object of material engineering research due to their potentialapplication, among others, in the construction of low-loss transformer cores. Such properties are typical for alloys with an amorphous structureand with a high content of ferromagnetic elements: Fe, Co, Ni. Difficulties related with obtaining alloys which meet satisfactory dimensions resultin the search for new solutions. One of them is the production of composites based on ferromagnetic powders obtained from amorphous alloys.This paper presents results of structure research for composite materials produced in a multi-stage production process. Magnetic compositeswere made on the basis of a bulk amorphous Fe70B20Y5Nb4Mo1 alloy produced by the injection method. On the basis of the obtained powder,two series of moldings were made: with 0.5% resin and covered with high-temperature varnish. Final composites were produced by using hightemperature isostatic press. On the basis of the conducted research, it was found that the composites without resin are characterized by distinctlybetter magnetic properties as compared to resin-bonded composites. [ABSTRACT FROM AUTHOR]