Reproducing characteristics of thin film heads

As the magnetic recording reproducing process can be assumed to be a kind of transmission line, the reproducing head shape is considered as one of the waveform transformation elements. This is known as a gap loss function for conventional heads. But such an analytical expression has not been obtained yet for recently proposed thin film heads with finite pole-tip length, comparable to the recorded wave length. This paper discusses the peak shift characteristics of finite length heads through a proposed approximate analytical expression for them, et al. suggests the possibility that peak shift of finite length heads exceeds that of infinite length ones, despite of the fact that finite length heads are generally said suitable for high density recording.