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自1927年首次用磁粉涂在纸基上试制成录音磁带以来,世界磁带工业迄今已有五十余年的历史。最初采用的磁粉是粒状Fe_3O_4。由于这种磁粉矫顽力低,仅80奥斯特,且漏码率高,因此,于五十年代初期,美国又研制成了针状γ-Fe_2O_3磁带,矫顽力达到300奥斯特,其它性能也有所改善。数十年来,由于γ-Fe_2O_3能满足一般磁记录技术的要求,而且性能稳定、制备简单、工艺也日益成熟与完善,因此,虽然到目前为
The tape industry in the world has been in existence for more than fifty years since it was first tested in 1927 on magnetic paper coated on paper. The original magnetic powder is granular Fe_3O_4. Due to the low coercivity of this kind of magnetic powder, only 80 Oersteds, and the high code loss rate, the United States developed a needle-shaped γ-Fe 2 O 3 magnetic tape in the early 1950s with a coercive force of 300 Oe. Other properties have also improved. For decades, since γ-Fe 2 O 3 can meet the requirements of general magnetic recording technology, and has the advantages of stable performance, simple preparation and increasingly mature and perfect process, so far,