Introduction to Electrodynamics — Instructor's Solutions by David J. Griffiths PDF

By David J. Griffiths

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Additionally, patterned media can be utilized to further extend the limits of magnetic recording [31]. In a patterned medium, the location and the size of the magnetic features are pre-determined by the medium manufacturing process. Elimination of the element of randomness characteristic to today’s polycrystalline recording media is a clear advantage of the patterned medium approach. However, for such a medium to become a serious contender to replace conventional alloy or multilayer media, an economically viable manufacturing process will have to be developed [32,33].

The characteristic dimension, at which the field starts to substantially change, is determined by the doubled (due the “image” by the SUL) distance between the ABS and the SUL. The trackwidth, W, of the SPH determines how narrow a track can be recorded. Therefore, the trackwidth value is set by a required areal density value. For example, at an areal density beyond 100 Gbit/in2, the trackpitch (the trackwidth plus the guard band) should be smaller than approximately 160 nm, assuming a 4:1 bit aspect ratio (BAR).

For example, at an areal density beyond 100 Gbit/in2, the trackpitch (the trackwidth plus the guard band) should be smaller than approximately 160 nm, assuming a 4:1 bit aspect ratio (BAR). Assuming that the guard band occupies approximately a fifth part (20 percent) of the trackpitch, the SPH should have a trackwidth of approximately 120 nm for recording an approximately 130 nm wide track. As to the pole thickness, as previously mentioned, in perpendicular recording, ideally, the actual recording takes place only near the trailing edge of the pole, therefore, one can have the pole thickness as large as necessary for the maximum increase of the recording field.

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Introduction to Electrodynamics — Instructor's Solutions Manual by David J. Griffiths


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