Track density limitation for dual-layer perpendicular recording in a rigid disk environment

Beaulieu, T.J.; Seagle, D.; Meininger, Martin; Spector, C.J.

doi:10.1109/20.42304

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…Furthermore, since this edge overwrite modification occurs most severely near the magnetization peaks of the previously written track, an increase of the linear bit density in the previously written track will result in more severe edge overwrite modulation. This agrees well with the observations in the previous experimental study [2].…”

Section: Edge Overwritesupporting

confidence: 83%

“…However, characteristics for narrow recording tracks and track edge performance still remain unclear for perpendicular recording. Experimental studies by Beaulieu et al suggested that written track in perpendicular recording exhibited sharp track edges and that unlike conventional longitudinal recording, and error rate increases sharply with head off-track displacement [2]. It was also found that contrary to longitudinal recording, off -track capability degrades with increasing linear recording density.…”

Section: Introductionmentioning

confidence: 94%

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Narrow track recording in perpendicular thin film media

Zhu

1993

IEEE Trans. Magn.

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Narrow track recording in a double-layer perpendicular film medium is studied via micromagnetic modeling. A 3D probe head field with a track width W=l.Spm is used for recording simulations. Recordings of multiple consecutive transitions are simulated. Edge transition patterns and edge overwrite properties are characterized. Simulated transition magnetization pattern at track edges turns towards to the head motion direction and extends to the next transition front. Edge overwrite is studied by simulating recording of a new track over an shifted previously recorded track. It is found that the edges of the new track exhibit no separations with the overwritten track and the inter-track edge of newly recorded transitions are strongly modified by the previously written transitions.

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Section: Edge Overwritesupporting

confidence: 83%

Section: Introductionmentioning

confidence: 94%

Narrow track recording in perpendicular thin film media

Zhu

1993

IEEE Trans. Magn.

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“…The recording conditions are given in Table II. Further details and a complete description of the head used in this study can be found in the reference of Beaulieu et al (24).…”

Section: Methodsmentioning

confidence: 99%

“…Several models have been formulated which attempt to provide fundamental insight into the mechanism of codeposition and to predict the effects of various parameters on this process (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34). The more recent models all envisage the same basic stages by which a particle, initially suspended in the electrolyte, is incorporated into the growing metal deposit (21).…”

Section: Introductionmentioning

confidence: 99%

Electroplated Magnetic Media with Vertical Anisotropy

Horkans

Seagle

Chang

1990

J. Electrochem. Soc.

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Alloys of CoMnP and CoNiMnP can be electroplated with a magnetic anisotropy normal to the substrate and a high coercivity in the perpendicular direction. The magnetic properties of the plated films are strongly influenced by the substrate on which they are deposited, since the substrate determines the thickness of the transition layer in which the perpendicular anisotropy is developed. The incorporation of Ni results in a greater degree of <00.2> preferred orientation of the hcp phase of Co and also increases the coercivity of the material, as evidenced by~VSM and x-ray diffraction on Cu coupons. The alloy properties are otherwise relatively insensitive to plating conditions. Dn NiP substrates, which resemble the NiFe underlayer of disks, the interfacial transition layer appears to be thicker than on Cu. Double-layer media disks were fabricated using these alloys and were tested with a single-pole head for vertical recording. The Ds0 values and noise levels were comparable to those of sputtered media, but the plated media exhibited lower signal levels. Disks with CoNiMnP media were not as good as those with CoMnP, possibly because of a thicker interfacial transition region. * In some cases, NiCI2 was substituted for part of the COC12.

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Magnetic force microscopy: General principles and application to longitudinal recording media

Rugar

Mamin

Guethner

et al. 1990

Journal of Applied Physics

591

286

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This paper discusses the principles of magnetic force microscopy (MFM) and its application to magnetic recording studies. We use the ac detection method which senses the force gradient acting on a small magnetic tip due to fields emanating from the domain structure in the sample. Tip fabrication procedures are described for two types of magnetic tips: etched tungsten wires with a sputter-deposited magnetic coating and etched nickel wires. The etched nickel wires are shown to have an apex radius on the order of 30 nm and a taper half-angle of approximately 3°. Lorentz-mode transmission electron microscopy of the nickel tips reveals that the final 20 μm is essentially single domain with magnetization approximately parallel with the tip axis. Images of written bit transitions are presented for several types of magnetic media, including CoPtCr, CoSm, and CoCr thin films, as well as γ-Fe2O3 particulate media. In general, the written magnetization patterns are seen with high contrast and with resolution better than 100 nm. A number of magnetic recording applications are discussed, including the investigation of overwrite behavior and the writing characteristics in CoSm media at high data density. Computer calculations were performed to simulate the MFM response to written magnetic transitions. By including the extended geometry of the tip, the nonparallel orientation of the cantilever, and the finite width of the magnetic transitions, good agreement with experiment was obtained. The model calculations correctly predict the experimentally observed change in image contrast that occurs as a function of tip orientation. Computer calculations showing the dependence of resolution on tip geometry are also presented.

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Track density limitation for dual-layer perpendicular recording in a rigid disk environment

Cited by 12 publications

References 6 publications

Narrow track recording in perpendicular thin film media

Narrow track recording in perpendicular thin film media

Electroplated Magnetic Media with Vertical Anisotropy

Magnetic force microscopy: General principles and application to longitudinal recording media

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