By Sakhrat Khizroev
Magnetic recording is predicted to develop into middle know-how in a multi-billion greenback within the within the very close to destiny. essentially the most serious discoveries concerning perpendicular write and playback heads and perpendicular media have been made merely over the past a number of years due to wide and in depth learn in either academia and of their fierce race to increase the superparamagnetic restrict within the magnetic recording media. those discoveries seem to be serious for enforcing perpendicular magnetic recording into a precise disk drive.
This publication addresses the entire open questions and matters which have to be resolved sooner than perpendicular recording can eventually be applied 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 collect enough wisdom of the physics of perpendicular magnetic recording so as to extra advance the sector of perpendicular recording.
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Extra resources for Perpendicular Magnetic Recording
Example text
This Figure also illustrates the definition of the skew angle, which is the angle between the direction of the track and the head axis of symmetry. A diagram of a track recorded by a SPH at a non-zero skew angle is shown in Figure 25b. It can be noted that at the condition of non-zero skew angle the recording is produced not only by the trailing edge but also by one of the sides of the trailing pole. For comparison, MFM images of two real tracks recorded with a SPH with a 500 nm thick pole at zero and a 15-degree skew angle onto a CoCr -based perpendicular medium are shown in Figure 25c.
Assuming typical values for T2 and T of approximately 1000 nm and 10 degrees, respectively, the side written region can be of the order of 150 nm, which is unacceptable at areal densities beyond 100 Gbit/in2. It should be reminded that the entire trackwidth is expected to be less than 150 nm at such high densities assuming a 4:1 bit aspect ratio (BAR). Trailing edge P2 Track direction T Side written region Figure 26. A diagram showing how the side recording is generated due to a non-zero skew angle.
A) The cross-track profiles at saturation for two values of the throat height, 100 and 500 nm. (b) The normalized profiles at saturation. The field 5 nm below the center of the main pole versus the drive current at three values of the throat height, 100, 200, and 500 nm, is shown in Figure 23a. The drive current is given in arbitrary units because the exact value of the current depends on a number of specific to each head design parameters, such as the exact location of the drive coil with respect to the ABS, the yoke geometry, etc.