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随着磁记录向高密度化发展,国外记录波长最短已达0.5μm,越来越需要有高质量的磁记录介质。目前在磁记录介质中,γ-Fe_2O_3已得到广泛的使用,这是因为γ-Fe_2O_3制造方便,价格便宜,稳定性好。但是由于γ-Fe_2O_3的矫顽力较低,分散性也不很好,不能满足高密度磁带记录的要求。为了满足高密度磁带的需要,人们已经对于高矫顽力的材料进行广泛的研究。掺钴型γ-Fe_2O_3、Fe_3O_4磁粉虽然能够提高矫顽力达1000○e左右,但是由于(1)磁晶各向异性强烈地依赖于时间和温度,(2)在压力下的磁滞伸缩损耗大,(3)取
With the development of high density magnetic recording, the shortest foreign wavelength has reached 0.5μm, more and more needs high-quality magnetic recording media. Currently in the magnetic recording medium, γ-Fe_2O_3 has been widely used, which is because γ-Fe_2O_3 is easy to manufacture, cheap, and good stability. However, due to the low coercivity of γ-Fe_2O_3, the dispersion is not very good, which can not meet the requirements of high-density tape recording. In order to meet the needs of high-density tape, extensive research has been conducted on materials having a high coercivity. Cobalt-doped γ-Fe_2O_3 and Fe_3O_4 magnetic powders can improve the coercive force up to 1000 ○ e, but (1) the magnetocrystalline anisotropy strongly depends on the time and temperature, (2) the hysteresis loss under pressure Big, (3) take