Formation and magnetic properties of the Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds have been investigated.It has been found that formation of single phase compounds Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) with Nd_(3)(Fe,Ti)_(29)-...Formation and magnetic properties of the Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds have been investigated.It has been found that formation of single phase compounds Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) with Nd_(3)(Fe,Ti)_(29)-type structure depends strongly on the content of stabilizing element Cr,and the solid-solution limit of Co in Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds increases with Cr content.Pure Co-based Gd_(3)Co_(29-y)Cr_(y) compounds with Nd_(3)(Fe,Ti)_(29)-type structure have been successfully synthesized with y=6.5 and 7.0.The Curie temperature Tc of Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds increases with increasing Co content x at fixed y,whereas increase of the Cr content leads to an obvious decrease of Tc of the Gd_(3)Co_(29-y)Cr_(y) compounds.Composition dependence of the saturation magnetization at 5 K reaches a maximum around x=7.5 and y=4.It is worth noting that substitution of Co for Fe results in a significant change of magnetocrystalline anisotropy of the Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds and changes the easy magnetization direction from basal-plane to easy-axis when x>10 and y=4.展开更多
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 magneti...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.展开更多
基金Supported by the National Natural Science Foundation of China under Grand No.58971061.
文摘Formation and magnetic properties of the Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds have been investigated.It has been found that formation of single phase compounds Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) with Nd_(3)(Fe,Ti)_(29)-type structure depends strongly on the content of stabilizing element Cr,and the solid-solution limit of Co in Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds increases with Cr content.Pure Co-based Gd_(3)Co_(29-y)Cr_(y) compounds with Nd_(3)(Fe,Ti)_(29)-type structure have been successfully synthesized with y=6.5 and 7.0.The Curie temperature Tc of Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds increases with increasing Co content x at fixed y,whereas increase of the Cr content leads to an obvious decrease of Tc of the Gd_(3)Co_(29-y)Cr_(y) compounds.Composition dependence of the saturation magnetization at 5 K reaches a maximum around x=7.5 and y=4.It is worth noting that substitution of Co for Fe results in a significant change of magnetocrystalline anisotropy of the Gd_(3)Fe_(29-x-y)Co_(x)Cr_(y) compounds and changes the easy magnetization direction from basal-plane to easy-axis when x>10 and y=4.
基金Supported by the National Natural Science Foundation of China under Grant No.59631070.
文摘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.
