A technique for measuring nonlinear bit shift

Tang, Yaw-Shing; Tsang, C.

doi:10.1109/20.278824

Cited by 70 publications

(14 citation statements)

References 7 publications

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“…4. Fifth harmonic elimination method was used for this test [5]. At frequencies where both the magnetic and electrical performances are pushed to the limit, nonlinear distortions in the write current waveform or the magnetic field waveform may occur.…”

Section: Resultsmentioning

confidence: 99%

Demonstration of 1 Gbit/sec magnetic recording using an integrated inductive write/GMR read head

Shi¹,

Liu²,

Chen³

et al. 2000

IEEE Trans. Magn.

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1 Gbit/sec magnetic recording was demonstrated with integrated inductive write/GMR read heads on a thin film disk with a coercivity of 3200 Oe and an Mrt of 0.34 memu/cm 2 with a spinstand tester prototyped by Guzik Technical Enterprise. The write heads were made with high moment materials on both P1 and P2 and a densely packed coil using conventional manufacturing processes, and the read heads were made of dual synthetic spin valve sensor used for the 36 Gbit/in 2 areal density demonstration. The interconnect between the head and pre-amplifier is a pair of twisted wires of about 2 inch length. The demonstration was done at the outer diameter of the disk rotating at 15 000 RPM. With a modest 35 mA (0-P) write current, we achieved an overwrite of about 30 dB and an on track error rate of better than 10 7 . BER test on a disk with a coercivity of 4000 Oe also showed very good results.Index Terms-High data rate magnetic recording, inductive write head, spin-valve read head.

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Section: Resultsmentioning

confidence: 99%

Demonstration of 1 Gbit/sec magnetic recording using an integrated inductive write/GMR read head

Shi¹,

Liu²,

Chen³

et al. 2000

IEEE Trans. Magn.

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“…Fig. 3 shows the amount of NLTS measured by using the fifth harmonic method [5] for each bit length in the experiments using a spinstand system. As can be seen from the figure, when the intervals to the previous transition are T b , 2T b , 3T b and 4T b or longer, the amounts of shifts are 3.1%, 13.3%, 13.9% and 14.2% of a bit interval T b , respectively.…”

Section: R/w Channelmentioning

confidence: 99%

Dependence of error patterns and BER performance on write pre-compensation in GPRML channels

Okamoto

Bushisue

Kurihara

et al. 2008

Journal of Magnetism and Magnetic Materials

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“…6 indicates dependence of the nonlinear transition shift (NLTS) on the DC-bias current for the head-B and the medium-B with DC-erased state. The NLTS was measured using a fifthharmonic cancellation method [5]. The small NLTS value of 5% could be obtained only by the DC-bias current control.…”

Section: Article In Pressmentioning

confidence: 99%

“…The direction of the transition shift in the former case does not vary with a polarity of the previously recorded bit. Therefore, a general pre-compensation method [5] to control the transition position by a write current phase shift can be used. On the other hand, in the later case, the transition shift should change in its direction according to the polarity of the DCerased magnetization.…”

Section: Introductionmentioning

confidence: 99%