写磁头对记录介质中输出信号的影响

Influence of the single-pole head on output-time decay in a perpendicular double-layered medium

在对垂直二层膜介质的输出信号随时间衰减的实验测试中 ,发现当使用单磁极磁头兼作读写磁头时 ,输出电压的变化量很大 .通过对这一现象的研究发现 ,影响介质退磁的外界原因主要有磁头主磁极膜磁畴的不稳定性和信号读出过程中主磁极对外界游离磁场的汇集吸收作用 .

In measurements of time decay in a perpendicular double-layered medium, a large output decay was observed when a regular single-pole head was used for both writing and reading. Investigations of this phenomenon revealed that the demagnetization of the medium was caused by the instability of the domain wall of the main pole film and also by the concentration of strayfields by the main pole during the reading process. Several countermeasures were proposed.