5Kulikowski J. Magnetostriction of Ni-Zn ferrites containing cobalt [J]. J Magn Magn Mater, 1982, 26: 297-299.
6Su H, Zhang H W, Tang X L, et al. Effects of composition and sintering temperature on properties of NiZn and NiCuZn ferrites [J]. J Magn Magn Mater, 2006,310(1): 17-21.