Peter K. George

Electrical characteristics of a 500 Mb/in/sup 2/ slanted contact MR head

Several approaches to achieving high area density in rigid disc magnetic recording with magnetoresistive heads are currently being pursued. The mainstream approach has been dictated by the introduction of two IBM products. These products use soft-adjacent layer (SAL) transverse biasing and either exchange coupling or permanent magnet longitudinal biasing. Rotated current biasing, characteristic of barberpole and slanted contact (SC) biasing, offers the advantages of processing simplicity but suffers from a relatively wide read sensitivity function (RSF). The 45/spl deg/ contact geometry produces a long tail on one side of the RSF which causes excessive adjacent track crosstalk. It is possible to produce readwidths as narrow as 2.5 /spl mu/m by using the proper current direction and narrow contacts. This approach allows the practical implementation of 5000-6000 tpi devices and 500 Mb/in/sup 2/ technology. This paper describes the electrical characteristics of one such design and attempts to extrapolate the future performance of SC technology. >

Origin of microtrack side bumps for a shared pole MR head on isotropic media

MFM observations on oriented and isotropic media are used to identify the source of side bumps seen for microtrack profiles written with a shared pole MR head. The effect is shown to arise from side writing and the orientation of the medium. MFM results for a pole-trimmed writer are also presented and the side-writing effect is shown to be diminished on isotropic media.