Magnetic properties of bulk amorphous Fe_(61)Co_(10)Ti_3Y_6B_(20) alloy near the Curie temperature

摘要

Purpose: The aim of this study was to conduct studies of the magnetic properties for a massive amorphous alloy Fe_(61)Co_(10)Ti_3Y_6B_(20).Design/methodology/approach: The investigated samples were prepared in the form of rods by using the suction-casting method. The material structures were investigated using X-ray. The magnetic properties were studied using a completely automated set up for measuring susceptibility and its disaccommodation. The magnetization as a function of magnetizing field was measured using magnetic Faraday's weight as a part of magnetocaloric effect studies.Findings: In the framework of this study, the structure and magnetic properties of the solid amorphous alloy Fe_(61)Co_(10)Ti_3Y_6B_(20) was examined. On the basis of the of X-ray diffraction obtained material was found to be amorphous alloy. Magnetic studies were carried out using a fully computerized system for magnetic susceptibility measures and its disaccommodation. It was showed that both susceptibility curve and isochoric disaccommodation curve maximum occurs in the transition from the state of ferromagnetic material into a paramagnetic state. This peak is called the Hopkinson maximum. From the curves of the magnetic susceptibility as a function of the temperature the value of the Curie temperature was established to about 550 K. Using the measurements of magnetisation as a function of magnetic field strength Arrott curves were constructed. The positive slope of the curves demonstrates the fact that the phase transition ferro-para is of the second kind. Using the magnetization curves the change of the magnetic entropy was determined. The biggest change of the magnetic entropy occur near the Curie temperature.Research limitations/implications: Based on studies carried out as part of this work it was found that the magnetic properties of investigated alloy, ie. magnetic susceptibility and its disaccommodation, are showing a clear change near the Curie temperature.Originality/value: The study of magnetic properties and their behavior in the vicinity of the Curie temperature.