Fe-TABANLI FeCoNiBSiNb İLE Co-TABANLI CoFeNiBSiNb CAMSI ŞERİTLERDE Cu İLAVESİNİN MANYETOKALORİK ÖLÇÜMLERE VE MANYETİK DİRENCE ETKİLERİ

Abstract

In this research, the effects of Cu addition which ranges from 0 % to 1 % to Fe-based Fe 0.402 Co 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 and Co-based Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 glassy ribbons obtained by melt spinning method on magnetocaloric and magnetoresistance properties were investigated. In this regard, structural analyzes of the samples were evaluated by XRD, thermal properties were analyzed by DSC measurements, Curie temperatures were obtained from dM/dT vs temperature curves, magnetic properties were determined by using M-H and M-T measurements, magnetic entropy changes depending on temperature were used to determine magnetocaloric properties of the samples. In addition to these, the temperature dependent magnetoresistances were measured and the effects of adding Cu element to the composition on magnetoresistance properties were investigated. As a result, it has been concluded that the appropriate addition of Cu (about 0.75 %) on Fe- or Co-based metallic glasses enhances magnetocaloric properties and the proposed composition can probably be used for magnetic refrigeration at high temperatures.