Magnetic properties of melt-spun Sm(Co0.9Fe0.1)6.8Zr0.2Cx ribbons with TbCu7structure

We have investigated the effect of carbon addition on the structure and magnetic properties of melt-spun Sm(Co0.9Fe0.1)(6.8)Zr0.2Cx (X = 0, 0.03, 0.06, 0.09 and 0.12) ribbons. The samples mainly have a single TbCu7 structure. The added carbon helps formation of a microstructure with fine and homogeneous grains. A coercivity, H-i(c), of 11.3 kOe and a maximum energy product, (BH)(max), of 6.8 MG Oe have been obtained for ribbons with x = 0 at a wheel speed of 40 in s(-1); a H-i(c) of 14.3 kOe and a (BH)(max) Of 10.9 MG Oe are achieved for ribbons with x = 0.06.