Magnetocrystalline anisotropy and exchange interaction in YCo12-xTix compounds

Magnetic and structural properties of YCo12-xTix compounds have been invest igated ly x-ray diffraction and magnetic measurements. X-ray diffraction pa tterns of aligned powder samples indicate that the easy magnetization direc tion at room temperature is along the c-axis for all the compounds. The lat tice parameters increase monotonously while Curie temperature Te decreases with increasing Ti content. It was found that all the compounds investigate d are strong ferromagnets by analysis of magnetic moments using a magnetic valence model. The values of;anisotropy fields B-a at room temperature and 1.5 K decrease with increasing x. The easy-axis anisotropy of the YCo12-xTi x compounds is mainly contributed by the Co atoms at Si sites according do the individual-site-anisotropy model.