Metal-in-gap record head

Jeffers, F.; McClure, R.; French, William W.; Griffith, N.

doi:10.1109/tmag.1982.1061995

Cited by 61 publications

(6 citation statements)

References 6 publications

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“…A least squares fit to the phase for has been performed for each pole recession. The two linear approximations to the phase (in degrees) are (2) when the leading pole is recessed by a quarter of the gap length and (3) when the recession is by half the gap length. Fig.…”

Section: Writing Characteristicsmentioning

confidence: 99%

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Eddy-current-assisted digital video read/write head

2001

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The paper describes write fields and replay characteristics of gapped heads with magnetically recessed leading poles for high-frequency digital video. It describes an investigation by finite-element analysis and compares computed results for laminated Sendust and Co 91 Nb 6 Zr 3 heads and discusses the effects due to depositing a layer of copper inside the leading gap edge. Recessing the leading pole yields an asymmetric field, while eddy currents in the copper layer cause an advantageous redistribution of flux in the head. Predicted increases in both maximum horizontal field and horizontal field gradient by at least 130% and 17% are predicted for Sendust and Co 91 Nb 6 Zr 3 heads, respectively, at 100 MHz. Hence, such a head can write on higher coercivity media than a conventional gapped head. The playback performance is also improved by an extension of the frequency response. The paper gives a linear model for the phase of the spectral response, valid over a wide range of frequencies, for each of two leading pole recessions.Index Terms-Digital magnetic recording, eddy currents, finite element methods, magnetic recording/reading heads, video recording.

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Section: Writing Characteristicsmentioning

confidence: 99%

“…Hence, the write field gradient over the trailing gap edge must also be high. Saturation of the trailing pole tip reduces the magnitude of the head field gradient above it [2] and as a result, all ferrite ring heads have been generally superseded by metal-in-gap (MIG) heads [3] to overcome this problem.…”

Section: Introductionmentioning

confidence: 99%

Eddy-current-assisted digital video read/write head

2001

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“…The MIG heads, wh i c hut il i z e h i g h B s met a 1 film s (e.g.,sendust) on the gap surfaces to avoid the magnetic saturation even in a narrow gap length, exhibit good recording performances [1].…”

Section: Introductionmentioning

confidence: 99%

Spacing Losses of Metal in Gap Head

et al. 1991

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Abstract---The spacing losses of two kinds(Single/Double sided) of MIG(Metal In Gap) heads for VCR systems are investigated. The spacing losses depend on the metal film recess. The spacing loss of the single sided MIG head is smaller than that of the double sided MIG head, even though the metal film recess is the same in both types of heads. It is considered that in the single sided MIG head, only the one side of the gap is recessed because one side of the gap is a ferrite. Therefore, the spacing of the single sided MIG head is smaller than that of the double sided MIG head.

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“…In the UNIHI VTR systems, flying erase heads are provided on the rotational drum with the read/write heads to erase the recorded signal, tracing along the signal tracks. The flying erase heads in UNIHI VTR systems have to be fabricated into a Metal-In-Gap(MIG) [2] structure with high saturation magnetization, such as using Sendust films in head gap edges, in order to generate a strong erase magnetic field on the high coercive tapes. A flying erase head for conventional VTRs has been reported [3].…”

Section: Introductionmentioning

confidence: 99%

Optimum Flying Erase Head Structure and Drive Conditions for Hi-Vision VTR Systems

1991

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A flying erase head structure has been optimized to achieve sufficient erasability for Hi-Vision VTR systems with high coercive (> 1,500 Oe) metal particle magnetic tapes. Preferable erase head drive conditions have also been determined from erasability dependence on erase current amplitude and head core arrangements to the magnetic tape running directions with a 21.4m1s relative velocity. It was found that the most superior· erasability over -30dB is obtained with 45mA erase current at 20MHz erase frequency in the MIG head with Sendust films on both sides of the head gap edges, which is assured by 2-dimensional numerical analysis.lt has also been clarified that the erase head field transition width and the number of the erase head field reversals in the transition width are important factors for determining the erasability in the high frequency recording.

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Metal-in-gap record head

Cited by 61 publications

References 6 publications

Eddy-current-assisted digital video read/write head

Eddy-current-assisted digital video read/write head

Spacing Losses of Metal in Gap Head

Optimum Flying Erase Head Structure and Drive Conditions for Hi-Vision VTR Systems

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