一.引言软磁铁氧体材料广泛用于VTR和计算机外部存贮器磁头中。由于它的电阻率为1～10~(12)Ω·m,比软磁合金高得多,高频损耗低,并且,高频时仍具有较高的初始磁导率(μ_5MH_2>500)。因此,软磁铁氧体在VTR和计算机外部存贮器磁头领域里占有重要地位。随着记录密度的不断提高,对磁头材料的磁性能的要求也愈高。用于磁头中的软磁铁氧体要具有高的最大磁导率,以减小记录磁头的输入功率,增 I. INTRODUCTION Soft ferrite materials are widely used in VTR and computer external memory heads. Its resistivity is 1 ~ 10 ~ (12) Ω · m, much higher than that of soft magnetic alloy, high frequency loss and high initial permeability (μ_5MH_2> 500) at high frequency. Therefore, soft ferrite plays an important role in the field of VTR and computer external memory heads. As the recording density continues to increase, the magnetic properties of the magnetic head material are also required to be higher. Soft magnetic ferrite used in the head to have a high maximum permeability to reduce the recording head input power, increased