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The structure investigation results and magnetic properties of microwires are presented. Initial microwires Co 68 Fe 5 Ni 1 Si 12 B 14 covered with glass insulation were obtained by the Taylor–Ulitovsky technique. It is shown that the crystallization of microwires occurs through the formation of the intermediate phase. The optimal soft magnetic properties are received in initial nanocrystalline state.

It is shown that the magnetic properties of CoMnBSi composition microwires sufficiently change during the annealing both at low and high temperature. The effects of amorphous–nanocrystalline structural transformation are discussed. The processes, which lead to the change in the magnetic characteristics at low annealing temperature are connected with the homogenisation of internal stress and short-order atomic structure relaxation.