Analysis of the Formation of Magnetic Transition in Digital Magnetic Recording System

The write head generates a magnetic field that permeates through the recording medium which is magnetized. By controlling the coil current of the write head, the magnetic field can be altered according to the bit pattern to be recorded. A magnetic field is generated when current passes through the write coil and a bubble is created under the head gap. If the field inside the write bubble exceeds the media coactivity segment of the media enclosed by the bubble is magnetized according to the current direction which means a transition is occurred. More closely transitions will lead to the recording of more number of bits for the same length of data track which means higher density. But transition is not sharp like a step function; rather it takes place over a finite length of media. In this paper, simulation analysis of Head field using Karlqvist model and its gradient are done with some design criteria and analysis of required head current has been done also. Finally analysis of transition width has been done by considering a given M-H loop and the Head field.