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Many view data storage on patterned magnetic media as one way of attaining storage densities in excess of 1 Tb/in/sup 2/ and thus overcoming the problems associated with recording at ultrahigh densities on conventional continuous media. In this paper we investigate, through the use of a replay simulation developed to take into account the three-dimensional(More)
The size, shape, and distribution of islands in a patterned medium depends on the patterning process adopted. The off-track performance in this case is mainly dominated by inter-track interference due to the neighboring islands. In this paper, the effect that the island distribution has on the off-track performance is investigated with respect to read(More)
In a move to extend the storage capabilities of magnetic storage systems beyond 1 Tb/in/sup 2/, the use of patterned media has often been cited. Here, recorded domains are constrained by the geometry of the magnetic island and not the geometry of the recording head. Conventional two-dimensional readout modeling techniques, using the reciprocity integral,(More)
The limitations of current lithographic techniques result in a variation of the geometry of the fabricated islands in bit-patterned media. These variations give rise to jitter in the replay waveform that has a detrimental effect on the recovery of stored data. By analyzing experimental bit-patterned media, we show that the presence of lithography jitter can(More)
Continuous thin film magnetic media have long been used in the data storage industry but densities above 1 Tbit/in<sup>2</sup> may not be possible due to onset of the superparamagnetic limit. Patterned media have been suggested as a possible means to exceed this limit, and it has been shown that irregularities in the shape and size of magnetic islands due(More)
This paper examines the application of low-density-parity-check (LDPC) codes to patterned media storage systems. An advanced model of the read channel that allows the investigation of data recovery techniques applicable to patterned media systems is developed. The paper also investigates what BER gain can be achieve by utilizing a soft-input-soft-output(More)
In this work, a 3D extension to the reciprocity integral which permits a thorough investigation of how medium characteristics, i.e. thickness, soft-underlayer (SUL), island shape, size as well as the across-track GMR head dimensions affect the readout waveform, is studied. This model is used to study the effects of track misregistration (TMR) and the effect(More)
Patterned magnetic media promises areal densities in excess of 1 Tbit/in<sup>2</sup> for data storage. However, current imperfect patterning techniques result in a variation in the dimensions and distribution of the fabricated islands. As a result, this variation introduces jitter in the replay waveform that makes data recovery difficult. In this paper, we(More)
In this study we utilise the finite difference time domain (FDTD) method to numerically solve the time-domain Maxwell curl equations in the derivative form to produce simulations of the cross-sectional focused light intensity distribution through the multilayered MAMMOS thin-film structure. However, via Bouguer theory, the approach described in this paper(More)
The general view is that the current use of a continuous magnetic thin-film for data storage will not be suitable for attaining storage densities in excess of 1Tbit/in<sup>2</sup>. As such, new storage technologies, such as the use of a patterned medium, must be explored. However, the development of patterned media as viable storage media is limited by the(More)