Error rate performance of experimental gigabit per square inch recording components

Howell, T.D.; McCown, D.P.; Diola, T.A.; Tang, Yaw-Shing; Hense, K.R.; Gee, R.I.

doi:10.1109/intmag.1990.734733

Cited by 10 publications

(14 citation statements)

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“…BER < 10 . noise source [2], [17], [18]. We expect that the trend of ever decreasing BAR's coupled with the lower constraints in the media grain size due to the super-paramagnetic limit will only exacerbate the above situation.…”

Section: B Media Evaluationmentioning

confidence: 99%

“…4. OTC (off-track capability) was determined as half of the bathtub widths at bit error rate of [18]. At the minimum track pitch where the corresponding OTC equals approximately to that of old information adjacent tracks [18], and OTC of 18% of track pitch were obtained at the track densities of 90.9 and 88.5 KTPI, respectively, corresponding to areal densities of 50.2 and 50.6 Gb in .…”

Section: Error Rate Performance Without Microactuatormentioning

confidence: 99%

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Demonstration and characterization of greater than 60 Gb/in/sup 2/ recording systems

et al. 2001

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We have successfully demonstrated longitudinal recording at areal densities greater than 60 Gb in 2 at data rates as high as 160 Mbps (20 MB/s) and at a Bit-Aspect-Ratio (BAR) of 5.7, using merged inductive-write/spin-valve-read heads with microactuators on low noise thin film disks. The heads were fabricated with the standard photolithography and wafer pole trimming used in currently available commercial products. At track densities of 60 KTPI and higher, traditional servoing mechanism will not be adequate. With the use of a microactuator, we can further improve the track density by 15%, the linear density by 10% and the areal density by more than 20%. Thus, using microactuator with the 50 Gb in 2 head/media combination we have increased our areal density achievement up to 63.2 Gb in 2 .

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Section: B Media Evaluationmentioning

confidence: 99%

Section: Error Rate Performance Without Microactuatormentioning

confidence: 99%

Demonstration and characterization of greater than 60 Gb/in/sup 2/ recording systems

et al. 2001

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“…More recently, magneto-resistive (MR) read heads have been used in high density magnetic recording because of their high read sensitivity [6], resulting in an increased signal-to-noise ratio. The use of such heads, however, can result in positive-negative peak 'asymmetry' in the data signal at the output of the read head [6], [7], [8]. That is, the magnitude of the response due to a positive magnetic transition differs from that of a negative magnetic transition.…”

Section: Introductionmentioning

confidence: 99%

Partial response equalizer performance in digital magnetic recording channels

Tyner

Proakis

1993

IEEE Trans. Magn.

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The performance of partial response linear and decision-feedback equalizers is evaluated for a digital magnetic recording channel having a symmetric pulse response and a magnetic recording channel having an asymmetric pulse response. Both linear and decision-feedback equalizers are considered, based on the zero-forcing criterion. Symbol-by-symbol detection and maximum-likelihood sequence estimation were investigated. The performance of the detection methods is evaluated both analytically and by Monte Carlo simulation.

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“…The transition shift phenomenon is well known and documented [l], and can be compensated by appropriate time shifting of the write current reversals [2]. The partial erasure effect, on the other hand, shares neither of these aspects.…”

Section: Introductlonmentioning

confidence: 99%

“…As this spacing is reduced, linear superposition ceases to accurately predict the shape of the output waveform. In the case of thin film media, as used in virtually all current fixed disk data storage devices, the nonlinear behavior (for initially erased media) is predominately of two types: a transition shift and an anomalous amplitude reduction or partial erasure effect.The transition shift phenomenon is well known and documented [l], and can be compensated by appropriate time shifting of the write current reversals [2]. The partial erasure effect, on the other hand, shares neither of these aspects.…”

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confidence: 99%

A simple statistical model of partial erasure in thin film disk recording systems

Barndt¹,

Armstrong

Bertram

et al. 1991

IEEE Trans. Magn.

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Absmcr-A simple statistical model of the partial erasure effect in metallic thin film recording is given. Experimental data is shown and was used to determine a fundamental parameter of the micro-magnetic structure of the medium. This single parameter determines the extent of erasure at any transition separation. Since it has no (rust order) dependence on the rate of the zigzags, it is anticipated that it will be relatively independent of the transition noise amplitude of the medium. INTRODUCTlONThe goal of achieving higher information densities in saturation recording invariably requires reducing the minimum spacing between magnetic transitions. As this spacing is reduced, linear superposition ceases to accurately predict the shape of the output waveform. In the case of thin film media, as used in virtually all current fixed disk data storage devices, the nonlinear behavior (for initially erased media) is predominately of two types: a transition shift and an anomalous amplitude reduction or partial erasure effect.The transition shift phenomenon is well known and documented [l], and can be compensated by appropriate time shifting of the write current reversals [2]. The partial erasure effect, on the other hand, shares neither of these aspects. It has only seen limited investigation, [3.4] for example, and no quantitative analysis has been done.However, an understanding of this thin film phenomena is critical to achieving extremely high density recording. Here dibit measurements at high densities will be analyzed utilizing a simple statistical model.A magnetic transition will be modelled by a random process across the track width which defines the location of a domain wall (i.e. a zigzag wall) separating mnes of opposite magnetization. A typical zigzag transition might look as shown in Fig. 1. If the recorded mck is very wide compared to the (average) width of the zigzags, then the cross track average is a good approximation to the actual average transition, and hence the output pulses look very similar to those which would be produced from an average transition. The average transition, Fig. 2, is often modelled as being a linear combination of an error function and an arctangent transition [ 11 characterized by two parameters: the percentage error function, and U, the transition width parameter.There is a second interpretation of this average transition profile that is used extensibly throughout this paper. Consider any point z located somewhere across the track. We would like to know the probability density that the domain wall at point z is located at some position x (in the recording direction), when the transition center is located at the position q. We will make the reasonable assumption that this probability density function (pdf) is independent of the value of z. Thus the average (normalized)

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Error rate performance of experimental gigabit per square inch recording components

Cited by 10 publications

References 0 publications

Demonstration and characterization of greater than 60 Gb/in/sup 2/ recording systems

Demonstration and characterization of greater than 60 Gb/in/sup 2/ recording systems

Partial response equalizer performance in digital magnetic recording channels

A simple statistical model of partial erasure in thin film disk recording systems

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