High-performance ferrite magnets: M-type Sr-ferrite containing lanthanum and cobalt

摘要

Magnetic properties of anisotropic M-type Sr-ferrite containing La and Co (Sr_(1-x)La_xCo_xFe(12-x)O_(19))was investigated in detail. At a composition of x=0.3, themagnetic properties for permanent magnets were much improved,with the highest values of Br=4.45 kG, HcJ=4.82 kOe, and(BH)_(max)=4.86 MGOe. The temperature dependence of thecoercivity was also much improved, with triangle openHcJ/HcJ/triangle open T= 0.1 percent/deg C.