By J. J. M. Ruigrok
Short-wavelength magnetic recording offers a sequence of functional options to a variety of difficulties within the box of magnetic recording. It positive factors many new and unique effects, all derived from primary rules due to updated study. a distinct part is dedicated to the playback technique, together with the calculations of head potency and head impedance, derived from new theorems. good points comprise: an easy and speedy process for measuring potency; an easy process for the exact separation of the learn and write behaviour of magnetic heads; a brand new thought - the bandpass head. different varieties of head coated comprise: the metal-in-gap head; the amarphous head; the thin-film head; the magneto-resistive head; and probe-type heads for perpendicular recording. The advent comprises a useful ancient precis of magnetic recording, and the publication additionally beneficial properties an intensive topic index, whole writer index, and a word list of symbols. ''The scope and mathematical rigour of this publication can basically be in comparison with W.K
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Extra resources for Short-wavelength Magnetic Recording. New Methods and Analyses
49) also shows an increase of the total magnetization owing to a decrease of the longitudinal component or an increase of the per pendicular component of the total magnetization in the backlayer due to the high /u2. 49) accounts for the distance * Note that the backlayer is disadvantageous for longitudinal recording and advantageous for perpendicular recording. > X 4= 4= Fig. 5. Sketch of the remagnetization in the coating and backlayer. Not the 'rear magnetic charges but the 'fictitious' mirror charges are depicted in the ideally-reflecting head and above the boundary 3-2 with the (partly) reflecting backlayer.
Sketch in Fig. 3; in free space x and y amplitudes are equal. ). 4] when starting with the same Mpx and Mnv. free space Fig. 3. Tape in free space. 32) becomes clear from the following example where infinitely permeable material is pre sent on the coating side of the tape, cf. Fig. 4. The boundary condition at y = -d4 reads W = constant = 0. 31). 3). 46) where (0, 1) is the unit vector in the y direction and 1 - Re~2kd* Here /u0Hy(—d4) is the density of the flux that penetrates into the infini tely permeable material.
When the tape is assumed to be free of dispersion, the permeability tensor is frequency independent and real. Although this will be assumed in all following chapters, we will treat the problem in this chapter with complex per meabilities for all magnetic layers and not only for the magnetic-smear layer 5 for reasons of uniformity and for the sake of completeness. 4] for a single-layer anisotropic medium in his study of the 'anhysteretic contact duplication pro cess'. We have adopted Tjaden's 'elegant' method for the more compli cated situation of Fig.
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