The magnet of the ferrite type where economic and physical properties improve

摘要

M pointed to one which is chosen from midst of the group which is formed by Sr, Ba, Ca and Pb element at least in the magnet of the ferrite type which includes the magnetic plumbite phase of chemical formula M_{1-xR xFe12-yT yO19}, R pointed to one which is chosen from midst of rare earth and Bi element at least, T pointed to one which is chosen from midst of Co, Mn, Ni and Zn element at least, in simultaneously with the ratio whose element T is low by being 0.15x0.42 and 0.50=y/x0.90, at the residual induction where Br is indicated with mT, Hk, was indicated with kA/m for B=0.9BrWhen corresponding to the magnetic field H, 580 or more, it reaches the point where you can obtain the ferrite magnet which possesses the comprehensive index GIP=Br+0.5Hk of efficiency of 585 or more desirably.