By Sakhrat Khizroev
ISBN-10: 1402026625
ISBN-13: 9781402026621
ISBN-10: 1402027230
ISBN-13: 9781402027239
Magnetic recording is predicted to develop into center expertise in a multi-billion greenback within the within the very close to destiny. one of the most severe discoveries concerning perpendicular write and playback heads and perpendicular media have been made basically over the past a number of years because of wide and extensive learn in either academia and of their fierce race to increase the superparamagnetic restrict within the magnetic recording media. those discoveries seem to be severe for imposing perpendicular magnetic recording into a precise disk drive.
This ebook addresses all of the open questions and matters which have to be resolved earlier than perpendicular recording can ultimately be carried out effectively, and is the 1st monograph in lots of years to deal with this subject.
This ebook is meant for graduate scholars, younger engineers or even senior and more matured researchers during this box who have to gather enough wisdom of the physics of perpendicular magnetic recording that allows you to additional boost the sphere of perpendicular recording.
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Additional info for Perpendicular Magnetic Recording
Sample text
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.
Perpendicular Magnetic Recording by Sakhrat Khizroev
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