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目前国内外录音磁带所用的磁性材料,大都为针状γ-Fe_2O_3粉末。有些用于极低速磁带,也有用针形CrO_2粉末。对它们的要求是针形应尽可能好,即其长宽比(l/b)应尽可能大。由于它的易磁化方向和针形的长轴方向相符,因而,在磁带制作过程中,利用外加磁场,使针状长轴沿给定方向(通
At present, the magnetic materials used in recording tapes at home and abroad are mostly acicular γ-Fe_2O_3 powders. Some are used for very low speed magnetic tape, but also useful needle-shaped CrO_2 powder. The requirement for them is that the needle shape should be as good as possible, ie the aspect ratio (l / b) should be as large as possible. Due to its easy magnetization direction and the long axis of the needle-shaped line, therefore, in the tape making process, the use of an external magnetic field, the acicular long axis in a given direction (through