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In this paper the results of the structure and magnetic studies for bulk amorphous Fe62Co10Y8B20 and Fe64Co10Y6B20 alloys were presented. For the structural investigation was performed by X-ray diffractometry. It was found that investigated samples were amorphous in the as-cast state. Using a vibrating sample magnetometer (VSM) the magnetisation within magnetic fields ranging from 0 to 2T was measured. On the basis of these investigations the saturation magnetization value and the coercive field were determined. Basing on initial magnetization curve analysis in the area of so-called approach to ferromagnetic saturation, the type of structural defects having influence on magnetization in high magnetic fields were determined.

This paper presents the results of tests on amorphous alloys Fe65Co10Y5B20, Fe63Co10Y7B20 in the state after solidification and after thermal treatment. The thermal treatment was performed below the crystallization temperature and above the Curie temperature (750K/25 min). The samples for the investigation had the shape of rods with a diameter of 1 mm and a length of 20 mm. The structure and magnetic properties were studied for the research material. The structure was investigated using XRD and the magnetic properties using VSM and FERROTESTER. XRD studies showed that the samples both in solidified state and after thermal treatment had an amorphous structure. The losses for the re-magnetization of the tested samples were comparable to those for commercially used FeSi materials. The process of magnetization in the vicinity of the area called the approach to ferromagnetic saturation is associated with all tested samples with rotation of the magnetization vector near free volumes. An interesting result of the conducted research is that not always a thermal treatment made on general principles leads to improvement of magnetic.