MAGNETIC PROPERTIES OF Co-Zn-Nb SUBSTITUTED Ba FERRITE PARTICLES

抄録

  In order to obtain Ba ferrite particles with improved characteristics for use in magnetic recording, a Co-Zn-Nb substitution system has been studied. The saturation magnetization increases with Zn substitution and shows a maximum. In this Co-Zn-Nb system, a high saturation magnetization is obtained, which is about 10% higher than that for Co-Ti substituted particles. In this case, the temperature coefficient of coercivity at around room temperature, dHc/dT, is about the same as that for Co-Ti substituted particles. On the other hand, with small Co substitution amount and large Zn substitution amount in this Co-Zn-Nb system, dHc/dT can be reduced to zero in the coercivity range applicable in magnetic recording.