Edge eliminated head

Yoshida, Mayumi; Sakai, Masanori; Fukuda, K.; Yamanaka, Noboru; Koyanagi, T.; Matsuzaki, M.

doi:10.1109/20.281315

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…After that, the air bearing surface was etched by ion milling. The etched depth was Figure 1 shows the pole surface view of the head, where leading and trailing pole edges are canted against the read/write gap [4], [5], and both upper and lower pole sides are etched to become almost the same in their width for the purpose of off-track capability enhancement [6]. The gap length and the number of coil turns are 0.25 f.l m and 34T, respectively.…”

Section: A Head Preparationmentioning

confidence: 99%

“…Previously, we reported that the undershoots ordinarily observed in readback waveforms of inductive thin film heads were satisfactorily suppressed by modifying the pole tip configuration at the air bearing surface [4] [5]. This was accomplished by canting both leading and trailing pole edges against the read/write gap through photolithography and an ion milling process.…”

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confidence: 99%

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Error Rate Measurement of Thin Film Heads through a PRML Read Channel

et al. 1994

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Bit error rates of inductive thin f"Ilm heads were evaluated through a PRML (partial Response Maximum Likelihood) read channel. The objective was to explore the amount of the error rate enhancement obtained by the suppression of the undershoots of the isolated readback waveform of thin film heads, experimentally and quantitatively. The undershoot suppression was realized by the shaping of the pole tips. The error rate was found to be improved by as much as 10 2 at 26 dB signal to noise ratio, by the undershoot elimination. It was also found that the difference of the error rate between the conventional thin f"Ilm head and the pole trimmed head became more remarkable as the signal to noise ratio increased.

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Section: A Head Preparationmentioning

confidence: 99%

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confidence: 99%

Error Rate Measurement of Thin Film Heads through a PRML Read Channel

et al. 1994

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“…The undershoot ratio, which is defined by the ratio of the leading undershoot amplitude divided by the amplitude of the main pulse, was found to be reduced from about 8% of conventional thin film heads down to around 2% of the pole trimmed thin film head. It was also shown that the improved readback waveform with suppressed undershoots was applicable to a PRML read channel processing [1]. The bit error rate of the pole trimmed head evaluated through a PRML read channel will be discussed in a separate paper [3].…”

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confidence: 99%

“…The objective is to weaken the track side fringing field and discour~ge the side cross talk to achieve higher track density by improving the off-track capability, in addition to the above mentioned undershoot elimination enhancement [1], [2]. The quantitative assessment of the off-track capability of the pole-trimmed thin film heads was carried out in comparison with conventional thin film heads.…”

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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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Inductive magnetic heads

Wang

Taratorin²

1999

Magnetic Information Storage Technology

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Edge eliminated head

Cited by 8 publications

References 1 publication

Error Rate Measurement of Thin Film Heads through a PRML Read Channel

Error Rate Measurement of Thin Film Heads through a PRML Read Channel

Off-track Capability of a Pole Trimmed Thin Film Head

Inductive magnetic heads

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