Bulk amorphous samples consist of more than three elements and are prepared by a rapid solidification of melted materials in a copper mold or on rotating roller. In order to obtain bulk amorphous alloys atomic radii of main components should differ more than 12 % and exhibit negative heat of mixing. Depending on the preparation method,  they have a form of rods, tubes, plates, cores of different shapes or ribbons with the thickness larger than 40 μm. The bulk amorphous alloys are obtained at a relatively low quenching rate and it is possible decomposition of the amorphous structure during their preparation.

The aim of this paper is to study the microstructure and magnetic properties of the multicomponent Fe₅₉Co₁₀Zr₂Y₄M₅Ni₅B₁₅ (where M denotes  late transition metals such as Mo, Ti or Nb). Ingots of the alloys  were obtained from high purity elements by arc melting. To obtain homogenous alloys, the ingots were remelted four times. The samples in the form of rods 1 mm in diameter and 2 cm long were prepared by a suction casting method in a protective argon atmosphere.  The microstructure of the alloys was studied using X-ray diffractometer and Mössbauer spectrometer. However, the magnetic properties i.e. saturation magnetization, coercive field and Curie temperature were obtained from measurements performed by a vibrating sample and force magnetometers.   From X-ray and Mössbauer studies it was stated that samples are fully amorphous but show inhomogeneous structure with regions with different concentration of magnetic elements. From the thermomagnetic curves  two Curie temperatures corresponding to the different magnetic phases can be obtained. The investigated alloys exhibit relatively high effective magnetic saturation polarization which is equal to about  1 T at room temperature. The coercive field determined from the hysteresis loops indicates that the investigated alloys are relatively magnetically hard.

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