It is necessary to develop a recording head having large recording field and small stray field to adjacent tracks and adjacent bits in perpendicular magnetic recording system. In this paper, in order to decrease the leakage flux in the adjacent bit, the approach of magnetic shield design of perpendicular magnetic recording head for 200 Gb/in 2 is performed by using the topology optimization technique.

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Abstract-Recently, the increase of areal recording density is remarkable. In order to develop a high density recording device, a read/write (R/W) simulation using three dimensional (3-D) magnetic field analysis is indispensable. In this paper, the magnetic field in a cusp-field single-pole-type (CF-SPT) head with discrete track media is analyzed using a 3-D R/W simulation system, in which edge-based finite element method and 3-D medium hysteresis model based on the ensemble of the Stoner-Wohlfarth (SW) particles are combined. The effects of ampereturns and the discrete track media on the distribution of recorded magnetization are investigated. The detailed behavior of flux around the discrete track media and continuous media is illustrated.Index Terms-Cusp-field single-pole-type (CF-SPT) head, discrete track media, magnetic recording, medium hysteresis model, three-dimensional finite element method.

To investigate the influence of the variation of the write track width in the discrete track recording, we calculated the off-track capability (OTC) of the write/read head using Landau-Lifshitz-Gilbert micromagnetic simulations. Recently, the OTC has become increasingly important in the system design of the hard disk drive (HDD). As for the write head, it is a serious problem that the write track width varies significantly in the manufacturing processes. In the simulations, we evaluated the OTC of the wite/read head as a function of the write track width on both conventional and discrete track media from the viewpoint of the signal-to-noise ratio (SNR).As a result, we found that the OTC of write/read head on discrete track media was superior to that of conventional media for variations of the write track width.Key words: micromagnetics simulation, write track width, discrete track medium, off-track capability, signal-to-noise ratio

Due to the considerable increase of magnetic recording density, the deviation of the head from the centerline of the track becomes a serious problem for the cross-track interference. In this paper, a three-dimensional read/write simulation system was used to investigate the effect of the width of the write head on the behavior of the flux and magnetization for continuous track medium and discrete track medium. It is shown that the magnetization in a neighboring track of the discrete track medium is smaller than that of the continuous track medium. The output of the read head using the discrete track medium is larger than that of the continuous track medium when a suitable read head width is chosen so that the cross talk is negligible.Index Terms-Discrete track medium, magnetic recording, three-dimensional (3-D) finite element method.