Inter-track orthogonal coding for ultra high track density recording

Honda, N.; Kikawada, Atsushi; Ouchi, Kazuhiro; Iwasaki, S.

doi:10.1109/20.490282

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…Note that the particle size of binary nanoclusters generally decreases with increasing concentration of impurity atoms and that the coercivity can increase with decreasing particle size for single-domain nanoclusters . In both CoCr films and bulk alloys, the coercivities are found to increase with decreasing grain size, ,, implying that the enhanced coercivities in CoCr NCWs may be related to the cluster size decrease due to alloying with Cr. Note that CoCr nanoclusters consist of small (3−5 nm) and large CoCr nanoclusters (10 nm), as observed in HRTEM micrographs.…”

Section: Resultsmentioning

confidence: 97%

CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

et al. 2002

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We report fabrication of CoCr binary nanocluster wires (NCWs) by thermally decomposing Co 2 (CO) 8 /Cr(CO) 6 metal carbonyl vapors by using a resistive heater placed in the middle of a pair of permanent disk magnets. In general, NCWs grow through the pile-up of binary CoCr nanoclusters perpendicularly to the substrates attached to the magnet surfaces. NCWs, ranging from 10 to 20 nm in diameter and also branching out while they grow, exist as a bundle. The bundles with lengths up to 2-3 mm form a three-dimensional array. We observed much higher coercivities and larger remanences for arrays with magnetic field applied parallel to the NCWs than those with magnetic field applied perpendicular to the NCWs. Importantly, we observed that arrays of CoCr NCWs with a 0.8-2.2 mol % Cr in which only Co-rich phase exists showed enhanced magnetic properties, that is, nearly doubled coercivities compared to that of the array of pure Co NCWs. When the Cr mole percentage is above 2.2, however, coercivities decreased because the amount of nonmagnetic Cr-rich phase increased accordingly.

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Section: Resultsmentioning

confidence: 97%

CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

et al. 2002

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“…In such narrow track recording, an increasing error rate by the interference can not be ignored. We had already proposed inter-track interference free coding, named ITOC(Inter-track orthogonal coding), which would realize guard-bandless recording without azimuth [2]. Because it can deduce a position error signal from the data signal, it is also expected to improve the precision track following of recording systems [3].…”

Section: Introductionmentioning

confidence: 99%

A Multitrack Coding Scheme Designed for Perpendicular Recording Using Double Layer Medium and MR Head

1997

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A new multitrack coding scheme is proposed as a preferable use in perpendicular recording using a double layer medium and an MR head. The coding uses combinations of three codes in 8 orthogonal codes based on Hadamard matrix elements. The new coding method has a high code rate and reliability because of the multilevel correlation detection due to simultaneous reading of three tracks. The performances are investigated by theoretical calculations, simulations and experiments.

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“…ITOe [5] each data sequence could be discriminated from the mixed signals. Figure 1 shows schematic views of write A multi-track recording head for dispersive writing and collective reading (DWCR) [1] is promising to realize a high speed data transmission and to solve difficulty in trackingservo of narrow track widths.…”

Section: Introductionmentioning

confidence: 99%

A New Head Design for Multi Track Perpendicular Magnetic Recording

et al. 1997

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A new head design of a planar configuration for multi track perpendicular magnetic recording is proposed. The new planar multi-track head consists 4 single-pole-type inductive write heads and 2 ring-yoke-type spin-valve MR read heads. In reproducing process, each MR head can read simultaneously signals from two tracks all together. To realize close-packed track recording, length direction of magnetic yoke of the write heads and head pole are arranged in the track and scan direction, respectively. Though this head consists of even 6 head-elements, the head fabrication process is almost the same as that of a conventional planar head. configuration has a possibility to make numerous heads simultaneously. Considering such advantages of a planar head, we propose a new head design of planar configuration for multi-track perpendicular magnetic recording. In this head structure, the signals of multi-tracks closed-packed narrow track recording can be read collectively. The detailed design and advantage of this novel head are discussed. IT. HEAD DESIGN CONCEPT A planar multi track (pMT) head consists of 4 single-pole-Key words: planar head, multi-track recording, perpendicular type (SPT) inductive write heads and 2 ring-yoke-type spinmagnetic recording, single-pole-type head, yoke-type GMR head valve (SY) MR read heads. In reproducing process, each MR head reads signals from two tracks all together. If we use

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Inter-track orthogonal coding for ultra high track density recording

Cited by 13 publications

References 8 publications

CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

A Multitrack Coding Scheme Designed for Perpendicular Recording Using Double Layer Medium and MR Head

A New Head Design for Multi Track Perpendicular Magnetic Recording

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