Theoretical study of integrated magnetic heads for high recording densities

The structure of integrated heads offers better possibilities of optimization than conventional heads. The length of the gap and the thickness of the pole tips can be optimized in order to obtain the best efficiency of the head during the writing process. This optimization relies on the magnetization distribution of a single transition. We will here study three transitions the separation of which is adjustable. The purpose of this paper is to show that the optimization of the write process is not always really convenient for high density recording. We use an iterative method the principle of which is identical to the one used for the calculation of a single transition. This method extended to three transitions reflects the magnetic history of the magnetization as faithfully as possible. During the computations, the magnetization varies on the major B-H loop or on the minor cycles taking into account the transition interactions and the demagnetizing fields. After the third position, the head is translated faraway. In order to understand better the method, a detailed diagram will be given. Results show us the density limitation of an integrated head with a given medium. In conclusion, this study shows that the pole tip thickness of integrated heads is an important parameter for magnetic peak-shift.