Side fringing of thin film heads with pole trimming

Su, J.L.; Ju, Kochan; Lo, Jeffery C. C.; Countryman, G.

doi:10.1109/20.104765

Cited by 14 publications

(6 citation statements)

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“…It differs from the reference head by an addition of a 0.5 pm thickness of soft magnetic material to P1 along the throat with the same trackwidth as P2. The primary motivation for this modification is to inherit the benefit of pole trimming [6] in the merged dual element heads. The second design considered in this paper, called the pinched head design, was originally proposed by Cohen [7].…”

Section: Write Head Designsmentioning

confidence: 99%

Modeling of submicron trackwidth inductive write head designs

Wang

Webb²

1995

IEEE Trans. Magn.

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Abstruct -Three dimensional finite element models have been utilized to simulate two proposed inductive write element designs in the merged inductive writelmagnetoresistive (MR) read heads, and the results have been compared with the conventional design. A new "raised throat" design was found to reduce the side write band by about SO%, which is the most favored approach for achieving submicron trackwidth recording among the head designs considered. A so called "pinched gap" head design was found to increase the side write band while decreasing head efficiency, thus was deemed unfavorable. It is concluded that the raised throat design can be adopted for ultra-high density recording.

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Section: Write Head Designsmentioning

confidence: 99%

Modeling of submicron trackwidth inductive write head designs

Wang

Webb²

1995

IEEE Trans. Magn.

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“…Erase bands and side read widths specific to each edge cannot be extracted from (3). Hence, we consider their mean values (4) (5) From ( 3) and (4), we find two distinct equations for calculating the mean erase band and (6) where, in the ideal case, . The same can be applied to (3) and ( 5) to get and (7) Note that no information from the right side track is needed to determine , and no information from the left side track is needed to calculate .…”

Section: Modelmentioning

confidence: 99%

“…We apply the model for investigating a helical scan silicon (HSS) head (Fig. 1), whose narrow dimensions and well aligned polar pieces are expected to minimize side effects [6].…”

Section: Introductionmentioning

confidence: 99%

Novel profiling model and side effects of helical scan silicon heads

et al. 2002

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Partial erasure of track edges was directly measured from triple-track patterns using a novel model to interpret the output profiles. The model is based on representing the read head as the sum of a reference width, wavelength independent, and two side reading effective widths that are wavelength dependent. We applied this technique to measure erase bands and side read widths of an advanced helical scan silicon head with 3.5-m pole width, in combination with metal particle tape with coercivity = 135 kA/m. The good pole alignment of the head minimizes side effects and we report an erase band of 0.3 m for a 0.5-m wavelength track overwriting the edge of a track having the same wavelength.

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“…Off-track profiles of the pole-trimmed thin film heads were measured in comparison with the conventional thin film heads [4], [5]. The results are shown in Fig.…”

Section: A Off-track Profilementioning

confidence: 99%

Off-track Capability of a Pole Trimmed Thin Film Head

et al. 1994

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The shaping of the pole tip configuration of inductive thin fIlm heads, at the air bearing surface by ion milling, is thought to be one of the promising technologies to boost the areal density of the disk drives. It was found to realize the undershoot suppression of the isolated readback waveform, which enables the heads to adapt to the PRML read/write channel processing easier. Further, the off-track capability was also found to be improved by truing up the track side edges of both upper and lower poles. The latter was achieved by trimming both sides of the upper and lower pole tips of inductive thin fIlm heads to become nearly the same in width, through photolithography and ion milling processes at the air bearing surface. The off-track capability enhancement attained by the pole trimming was experimentally estimated by performing off-track proftle evaluation and "747 curve" measurement. The difference between the effective track width and the upper pole width (ETW-P2W), which represents the amount of the effect of track side writing and side crosstalk, was found to be reduced to 68% of that seen in conventional thin film heads. It was also found that the track interval can be squeezed by as much as 1.0 f.l m more than conventional thin ftlm heads, based on the 747 curve comparison. I. INTRODUCTION

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Side fringing of thin film heads with pole trimming

Cited by 14 publications

References 1 publication

Modeling of submicron trackwidth inductive write head designs

Modeling of submicron trackwidth inductive write head designs

Novel profiling model and side effects of helical scan silicon heads

Off-track Capability of a Pole Trimmed Thin Film Head

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