Experimental analysis of tape noise

Roesler, Alexander William; Zhu, Jian‐Gang

doi:10.1109/20.950920

Cited by 6 publications

(1 citation statement)

References 8 publications

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“…16 Peaklike or combined peak-like/trough-like mixtures have been observed in double layer and lately produced conventional particulate media, 11 with the peaks at, or around, the demagnetized state generally attributed to better dispersed ͑uncor-related͒ particles. A recent study on dual-layer MP 2 (MP ϩϩ ) tape 17,18 found that peak-like or trough-like behavior was dependant on the gap of the write head used to apply the dc magnetic state. As the trough was only observed for the widest gap write head, it was concluded that this was a result of the associated reduction in the write field gradient ͑approximated to zero by the authors in their subsequent analysis͒ generated by the head in the medium.…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic layer thickness and of head-to-medium spacing on noise in advanced particulate recording media

Mercer

Bissell

Ardeleanu

et al. 2003

Journal of Applied Physics

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Effects of magnetic layer thickness on noise in advanced double-layer metal particle tape Recording performance of the combination of magnetoresistive head and thin metal evaporated tapeThe effects of magnetic layer thickness on the noise characteristics of advanced metal particle tape have been observed using a dc demagnetization process generated with a uniform in-plane magnetizer. The three-dimensional ͑3D͒ surface maps of spectral noise power plotted as a function of remanent magnetization state showed a change in behavior as the recording layer became thinner. The thickest magnetic coating of 310 nm showed ''trough-like'' characteristics associated with conventional thick particulate media. The thinnest sample with a 165 nm magnetic coating showed a ''peak-like'' response that is observed in continuous thin-film media, with a graduated trend from one to the other for the two intermediate samples. A simulation of these results has been made with an 8000 spherical particle micromagnetic model of the media remanent states and a simulated magnetoresistive read head. Noise maps produced from the simulation compared well with experiment. Spatial isolation of the noise contributions was achieved by dividing the modeled magnetic layer into sublayers. This revealed that particles at the surface were the source of the ''peak-like'' response, and their contributions became more dominant as the magnetic coating got thinner. Further model investigations showed an association of the different sublayer characteristics with a change in the mean magnetostatic interaction field. The interaction field of particles at the surface had characteristics similar to those of 2D granular thin films and hence generated ''thin film-like'' noise. A further effect was associated with the spacing between the head and various regions of particles. As this was increased, not only was the amplitude of the noise reduced, but the increased region of integration meant that longer range correlations were incorporated into the observed characteristics, resulting in noise maps more like those of conventional thick particulate media.

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Section: Introductionmentioning

confidence: 99%

Effects of magnetic layer thickness and of head-to-medium spacing on noise in advanced particulate recording media

Mercer

Bissell

Ardeleanu

et al. 2003

Journal of Applied Physics

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Evaluation of MP tape packing homogeneity through depth-probing

Roesler

Zhu

2001

Journal of Magnetism and Magnetic Materials

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Understanding the effect of the tape surface on the metal-particle tape medium noise

Roesler

Zhu

2002

Journal of Applied Physics

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Spacing fluctuations resulting from the head–tape interface dominate the metal-particle tape medium noise. Utilizing narrow-gap record heads, the spatial correlation of the head-medium interface has been completely and accurately characterized using a magnetic recording measurement. The measurements show that the spacing fluctuations damp with shorter wavelength, or in other words, the tape head-medium noise possesses a long spatial correlation length. In addition, the results demonstrate that the roughness-induced spacing fluctuations originate from portions of the tape surface that contact the tape, i.e., the load-bearing surface. This understanding of the head-medium noise reveals that the majority of the tape medium noise occurs during the recording process, and not during signal playback. Spatial correlation measurements on low-density (5 kfci) recordings provide verification of these conclusions. The study offers a thorough understanding of the surface roughness role on producing the head-medium noise.

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Experimental analysis of tape noise

Cited by 6 publications

References 8 publications

Effects of magnetic layer thickness and of head-to-medium spacing on noise in advanced particulate recording media

Effects of magnetic layer thickness and of head-to-medium spacing on noise in advanced particulate recording media

Evaluation of MP tape packing homogeneity through depth-probing

Understanding the effect of the tape surface on the metal-particle tape medium noise

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