含钴针状氧化铁,其磁性能不稳定,引起高能磁记录介质性能降低,若在这种氧化物里引进少量锌,便能稳定其化学性能及磁性能。这种稳定效果的取得,是因为锌具有减少钴——氧化铁的结晶各向异性的能力。化学稳定及磁性能稳定的程度,不仅仅取决于锌含量,且与锌及钴的比例有关。另外,由这种磁粉制得的磁带,和钴——氧化铁磁带不同,在外压下,没有磁致伸缩损耗。 Cobalt-containing needle-shaped iron oxide, whose magnetic properties are unstable, causes the performance of high-energy magnetic recording media to be reduced, and if a small amount of zinc is introduced into this oxide, its chemical and magnetic properties can be stabilized. This stabilizing effect is achieved because zinc has the ability to reduce the crystalline anisotropy of cobalt-iron oxide. The degree of chemical stability and magnetic stability depends not only on the zinc content but also on the ratio of zinc and cobalt. In addition, unlike the cobalt-iron oxide tape, magnetic tapes made from such magnetic powders have no magnetostriction loss under external pressure.