By H. Neal Bertram
This e-book is designed to offer the coed a primary, in-depth figuring out of all of the crucial good points of the magnetic recording strategy for either excessive density disk and tape recording. The e-book presents a radical grounding in 4 uncomplicated parts of magnetic recording: constitution and fields of heads and media, the replay technique, the recording procedure, and medium noise research. in addition to the basic matters, key structures questions of nonlinearities, overwrite, facet tune phenomena, errors price estimates in addition to comparisons of MR and inductive heads might be mentioned. the coed can be in a position to use the knowledge offered to layout and learn key experiments for head and medium evaluate in addition to for total approach functionality judgements. A parallel remedy of time and frequency reaction will allow the scholar to guage sign processing schemes. The booklet is meant both for senior-year undergraduates or first-year graduates. It assumes that the reader has had uncomplicated introductory electric engineering or physics classes equivalent to electrical energy and magnetism and utilized arithmetic.
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Extra resources for Theory of Magnetic Recording
In magnetic recording two types of motion are of interest: the motion of electrons along wires and the orbital and spin atomic motion of electrons in solids. Current is characterized by a current density J or current / for thin wires. The atomic motion may be characterized by a magnetic moment for each electron, or in less detail (for oxides with localized spins) by a net vector moment per atom. For atomic moments the magnetic moment characterizes the circulating or rotating charge motion and is, in essence, a charge angular momentum.
The complete field involves a vector integration over spatially changing charge distributions and vector orientations to observation point. An alternative view of the incremental field is that the field magnitude is given by the local charge density (nf • M(r) or - V • M(r)d(r — r')) times the incremental solid angle seen from the observation point d V / | r — r'\2). In the case of plane surfaces with a constant surface pole density, as in the example in Fig. 21) where ft is the solid angle (Fig.
6. s = ±a/y/2 denotes the sample boundaries. 18). As a corner is approached from inside, the field becomes positive and eventually infinite at the precise corner. Outside the square the field decreases continuously from infinity as distance from the corner is increased. This example gives insight into pole tip saturation of a recording head. Real materials do not remain uniformly magnetized in the presence of such a non-uniform field. In general, the magnetization will reorient toward the field direction (or demagnetize) in a complicated manner depending on the magnetic interactions and sample geometry.
Theory of Magnetic Recording by H. Neal Bertram