Magnetocrystalline Anisotropy and Exchange Interaction in YCo_(12-x)Ti_(x) Compounds

Magnetic and structural properties of YCo_(12-x)Ti_(x) compounds have been investigated by x-ray diffraction an magnetic measurements.X-ray diffraction patterns of aligned powder samples indicate that the easy magnetiB zation direction at room temperature is along the c-axis for all the compounds.The lattice parameters increase monotonously while Curie temperature TC decreases with increasing Ti content.It was found that all the com pounds investigated are strong ferromagnets by analysis of magnetic moments using a magnetic valence model.The values of anisotropy fields B_(a)at room temperature and 1.5K decrease with increasing x.The easy-axisanisotropy of the YCo_(12-x)Ti_(x)compounds is mainly contributed by the Co atoms at 8i sites according to the individual-site-anisotropy model.