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新磁性材料——“吸钴”氧化铁,是为高密度磁记录介质研制的一种针状单畴粒子,几种普通掺钴或改进型氧化铁的磁性不稳定性,在这种“吸钴”氧化铁材料中得到了改进、这种材料的结构与其它材料的完全不同。一般说来,用于磁记录介质的磁粉,其结构从里面到外表都是均匀的,但是,这种磁粉具有掺杂物,如里面是纯氧化铁,表面部份是通过吸附钴离子,形成钴含量高的结构层。由于吸附钴离子后的表面各向异性,按照10~6 g/Cm~3顺序排列。此种表面各向异性是单(同)轴的,而且它的方向与针状磁粉的形状各向导向重合,矫顽力的温度系数小,和纯γ—氧化铁一样。用这种吸钴氧化铁磁粉制成的新磁带,用于高偏磁家灵象磁带和盒式录音磁带两个方面,这种家庭录音磁带,在彩色S/N 和最大输出电平方面,比普通磁带更高。而这种盒式录音磁带的灵敏度、最大输出曲平和高输出电平时的频率响应,也比普通盒式录音磁带高.
The new magnetic material, “cobalt-absorbing” iron oxide, is a needle-shaped single-domain particle developed for high-density magnetic recording media. The magnetic instability of several common cobalt-doped or modified iron oxides, Cobalt "iron oxide material has been improved, the structure of this material and completely different from other materials. In general, the magnetic powder used in magnetic recording media has a uniform structure from the inside to the outside, but the magnetic powder has a dopant such as pure iron oxide inside and the surface portion is formed by adsorbing cobalt ions Structural layers with high cobalt content. Due to the adsorption of cobalt ions after the surface anisotropy, in accordance with the order of 10 ~ 6 g / Cm ~ 3. Such surface anisotropy is single (same) axis, and its direction coincides with the needle-shaped magnetic anisotropy direction of the coke, the temperature coefficient of coercivity small, and pure γ-iron oxide. The new magnetic tape made from this cobalt-attracting iron oxide magnetic powder is used for both high bias magnetic home tapes and cassette tapes. Such home audio tapes, in terms of color S / N and maximum output level, Higher than normal tape. The sensitivity of such cassette tapes, the maximum output curl and high output level when the frequency response, higher than ordinary cassette tape.