On improved durability characteristics for a Co-Cr flexible disk system

Kadokura, S.; Kamei, K.; Teranishi, Kohji; Sobajima, S.

doi:10.1109/tmag.1987.1065336

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…(1) Microstructures in the Co-Cr-Ta thin films of 150 nm thickness were observed to be Co-rich particles of some 20 nm in diameter being packed densely and homogeneously. This type of microstructure in Co-Cr alloy thin film was confirmed to show superior toughness to that of columnar one on pass wear and tribological tests [9]. (2) Surface roughness and magnetic properties of the Co-Cr-Ta thin films were controlled to be almost constant under wide range of PAr, and showed high quality for high density magnetic recording media (Hc.L ~ 1000 oe, Hc ~ 260 oe, Hk -4.3 koe and Rmax < 10 nm) [10].…”

Section: Resultsmentioning

confidence: 78%

“…A high orientation of the c-axis of the hcp structure perpendicular to the substrate plane is considered to be mainly influenced by the kinetic energy of the sputtered-atoms [8] and moderate bombard energy on thedepositionplane. Figure 7, 8 shows the coerclvtty Hc..L (perpendicular) and HCII (in plane), the anisotropy field HK, respectively, as a function of the coating drum temperature TD in comparison with DCMS [9] and the OTS. The sputtering conditions were shown in Table 2 and were same as those in the paper except target composition [10].…”

Section: Microstmct\1re and Crystallinity Of Co-cr Filmsmentioning

confidence: 99%

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CONTROL OF CRYSTALLINITY AND MICROSTRUCTURE OF Co-Cr FILMS BY CLUSTER FORMATION IN AN OPPOSING TARGET SPUTTERING

Kadokura

Naoe

1991

J. Magn. Soc. Jpn.

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The opposing target sputtering (OTS) is characterized to be a unique method for microcluster fonnation of any high melting-point materials. This method was applied to form Co-cr films for discussing thin film formation process compared with RF magnetron sputtering and DC magnetron sputtering. Co-Cr film fonnation with the OTS is characterized on the following properties for high density magnetic recording media. Densely packed microstructures of small-sized particles are typically observed to be in the Co-Cr thin films prepared by the OTS. High c-axis crystallite orientation of h.c.p. structure can be obtained from less than 20 nm-thick Co-cr films by the OTS. More than 1000 oe of perpendicular coercivity was obtained at lower substrate temperature than 150°C. It is thought that the effects of cluster formation and reduced energy loss of sputtered-atoms in the OTS process take out the above properties on the Co-Cr films.

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Section: Resultsmentioning

confidence: 78%

Section: Microstmct\1re and Crystallinity Of Co-cr Filmsmentioning

confidence: 99%

CONTROL OF CRYSTALLINITY AND MICROSTRUCTURE OF Co-Cr FILMS BY CLUSTER FORMATION IN AN OPPOSING TARGET SPUTTERING

Kadokura

Naoe

1991

J. Magn. Soc. Jpn.

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“…Though FD with magnetic layer prepared by sputtering can be expected to give higher density. This possibility was investigated eagerly by many researchers about 10 to 20 years ago with limited success [2]- [5].…”

Section: Introductionmentioning

confidence: 99%

Possibility of 3 Gbits/in/sup 2/ floppy disk

Nagao

Usuki²,

Nishikawa³

et al. 2000

IEEE Trans. Magn.

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We tried to realize Gbits/in 2 class Floppy Disk with a magnetic layer prepared by sputtering (SP-FD). The heat-durable undercoat and the underlayers made magnetic layer have Gbits/in 2 properties, with higher S/N and narrower PW50 in comparison with those of 3.1 Gbits/in 2 HD. Heat durable substrate, fine protrusions and aerodynamics consideration allowed to achieve stable and nonaggressive contacts and good durability after running for more than 250 hours at three different environment conditions. We can conclude that the SP-FD has the potential of 3Gbits/in 2 FD Index Terms-Magnetic recording, head-disk interface, thin film, floppy disk.

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“…The tribological behaviour of Co-Cr layered disks was clearly characterized by properties of solids (deformation and fracture of thin metal layers) and frictional conditions of the Co-Cr layered disk system [1,2].…”

Section: Introductionmentioning

confidence: 99%

A TRIBOLOGICAL STUDY OF NEW HEAD-PAD SLIDERS FOR A Co-Cr LAYERED FLEXIBLE DISK SYSTEM

et al. 1989

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Abstracts---Both axial runout and signal durability of a Co-Cr/Permalloy flexible disk with diameter 3.5", were studied using a disk drive with a pair of pads arranged in series relative to the disk radial direction, and with a single-pole type head.In the drive, the radial position of the head was 35 mm at disk revolution rates ranging from 600 to 1200 rpm, to evaluate the effect of the pad configuration on the runout characteristics and read-write properties. The runout of the disk were suppressed less than 10 ~m, and frequency spectra of the suppressed runout were observed up to ~ KHz. Stable read-write characteristics of the disk were observed in the high-density region over 70 kfci under a head pressure of about 3 mN and runout of less than 10 ~m.An out-put signal loss over 70 kfci was less than 1 dB after 7 million times of the head passes.No scrutches were observed on the disk surface and the head-pad sl iders after the durability test.

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On improved durability characteristics for a Co-Cr flexible disk system

Cited by 11 publications

References 6 publications

CONTROL OF CRYSTALLINITY AND MICROSTRUCTURE OF Co-Cr FILMS BY CLUSTER FORMATION IN AN OPPOSING TARGET SPUTTERING

CONTROL OF CRYSTALLINITY AND MICROSTRUCTURE OF Co-Cr FILMS BY CLUSTER FORMATION IN AN OPPOSING TARGET SPUTTERING

Possibility of 3 Gbits/in/sup 2/ floppy disk

A TRIBOLOGICAL STUDY OF NEW HEAD-PAD SLIDERS FOR A Co-Cr LAYERED FLEXIBLE DISK SYSTEM

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