Underlayer induced noise and carrier to noise ratio in a double-layer medium

Numazawa, Junji; Yoneda, Y.; Yokoyama, Katsuya

doi:10.1016/0304-8853(86)90936-4

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…It has been reported that there are close relationships between the magnetic characteristics of Ni-Fe backlayer and the readback sensitivity and noise level, since this layer provides a path for recording and readback magnetic flux [3]. The recording and reproducing characteristics have been investigated for the flexible disk with Co-Cr/Ni-Fe bilayered film in which the uniaxial magnetic anisotropy of the Ni-Fe layer was in-plane.…”

Section: Design Proceduresmentioning

confidence: 99%

Thin film tape media with multilayers by sputtering

et al. 1993

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Magnetic tape with Co-Cr/Ni-Fe multilayer has been prepared by using facing targets sputtering system and 10 ,um thick polyimide sheet as a substrate. Reahrite characteristics of this tape have been investigated using conventional VTR equipped with highly sensitive single-pole head. It has been proven that even tape with total thickness of magnetic layers of 033 p m should be highly eMcient in recording and reproducing performance.

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Section: Design Proceduresmentioning

confidence: 99%

Thin film tape media with multilayers by sputtering

et al. 1993

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“…No seed layer was necessary because the NiP does not oxidize sufficiently to inhibit conduction. During the plating process a uniaxial field of several hundred Oersteds was applied in the plane of the disk to establish an easy axis across the disk [3]. Thus as seen by the head, the easy axis rotates through one revolution as the disk rotates a revolution underneath it.…”

Section: Experimental Configurationmentioning

confidence: 99%

“…In vertical recording schemes that employ a soft magnetic underlayer, high amplitude noise spikes can be induced during readback [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The source of this noise is generally accepted to be domain walls in the underlayer.…”

Section: Introductionmentioning

confidence: 99%

Underlayer Noise in Rigid-Disk Perpendicular Recording

et al. 1989

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In vertical recording schemes that employ a soft magnetic underlayer, high amplitude noise spikes can be induced during readback. We have focussed in our study on thick (nominal 2 um), high permeability (nominal 2000) NiFe which appears to be necessary from modelling considerations to establish a reasonable head efficiency for a pole-keeper structure. We report here data showing in the rigid-disk environment the noise is dispersed low enough in the spectrum to suggest modest high pass filtering as a solution. We also report hard layer erasure associated with large spikes. From some simple calculations of the flux coupling the head from these spikes, a model of noisespike-induced, hard-layer erasure is proposed. By demonstrating that the noise scales in both amplitude and time with media velocity we have ruled out Barkhausen jumps as the primary mechanism of flux change.

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