Developments and advances in thin layer particulate recording media

Saitoh, Shinji; Inaba, Ryoji; Kashiwagi, A.

doi:10.1109/20.490175

Cited by 37 publications

(6 citation statements)

References 12 publications

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“…surface height almost twice that of ME and MP tapes, and generally has higher roughness data than the other tapes. It has been suggested that difficulty in dispersing BaFeO particles during the tape coating process causes high roughness of BaFeO tape (7). High roughness of BaFeO tape may inhibit its record and playback performance at the short recording wavelength (0.6 ìm) used in this study.…”

Section: Head and Tape Specimensmentioning

confidence: 98%

“…Innovations of reduced and more uniform particle size and a new double coating technology which makes possible ultra-thin particulate magnetic coatings by utilizing a nonmagnetic underlayer of fine particulates have led to a dramatically improved short-wavelength performance for MP and BaFeO tapes (5,7). Double coating technology produces thin ultra-smooth coatings for both MP and BaFeO tapes, and thus reduces spacing loss, demagnetization fields and isolated pulse width.…”

Section: Introductionmentioning

confidence: 99%

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Friction, wear and magnetic performance of metal evaporated and particulate magnetic tapes

Patton

Bhushan

1997

Proceedings of the Institution of Mechanical Engineers, Part J:

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Metal evaporated (ME), metal particle (MP) and barium ferrite (BaFeO) magnetic tapes are leading candidates for ultra-high-density magnetic tape recording applications. Using a commercial video cassette recorder as a magnetometer and the Wallace equation, changes in the r.m.s. head output level were correlated to changes in head-to-tape spacing as tape wear occurred during play=rewind cycling tests. Interface stability and recording performance at a 0.6 ìm recording wavelength were measured to bit level resolution using a drop-out counter. Some pause mode testing was done for comparison with streaming mode experiments. Methodologies to measure head and tape wear were developed and applied to worn specimens. Development of the experimental apparatus with nanometer vertical and submicrosecond temporal resolutions has enabled unprecedented understanding of the interplay of friction, wear and surface topography in a sliding contact. Waviness of ME tape and high roughness of BaFeO tape led to poor highdensity recording performance as compared to the excellent performance of the flat MP tape. Interface stability generally improved as the tapes were used and worn smooth by the rotary heads, and head-to-tape spacing was reduced by about 10 nm over 1000 play=rewind cycles for the tapes. ME tape showed the least durability of all of the tapes, and damage areas initiated at high points or bumps on the tape surface were connected by lateral cracks (driven by longitudinal tension) across the tape width at tape failure after about 800 play=rewind cycles. MP tape performance improved gradually through 1000 play=rewind cycles. High asperities on the virgin tapes were severed off the tapes during the record pass, and those that remained on the tape surface increased friction force and tape wear by three-body abrasion early on in play=rewind cycling tests. Lower friction and virtually no wear were observed later in cycling tests when loose wear debris were no longer on the tape surface and the wear mechanism was adhesive. The wear coefficient in the streaming mode was larger than that in the pause mode due to abrasive particles in the contact interface in the streaming mode. MP and BaFeO tapes caused head stains on the metal core and glass surfaces of composite metal-in-gap heads. Anisotropic high tape stiffness led to asymmetrical head wear and head contours with large radii of curvature.

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Section: Head and Tape Specimensmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Friction, wear and magnetic performance of metal evaporated and particulate magnetic tapes

Patton

Bhushan

1997

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…MP tapes are double coated with a top magnetic layer thickness of 0.3 í m and a non-magnetic underlayer thickness of 1.2 í m [12,13]. The upper magnetic layer consists of fine metal magnetic particles and non-magnetic alumina (0.2-0.3 í m in diameter, spherical) and carbon (20-30 nm in diameter, spherical) particles and a small quantity of fatty acid ester lubricant dispersed in a polymeric binder.…”

Section: Head and Tape Specimensmentioning

confidence: 99%

Durability and failure mechanisms of digital tapes in a rotary tape drive

Bhushan

2001

Proceedings of the Institution of Mechanical Engineers, Part J:

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The durability and failure mechanism of digital metal-evaporated (ME) and digital metal particulate (MP) tapes were investigated. Shuttle and pause mode tests were performed at ambient and different environmental conditions using a modified digital camcorder as a wear tester. Physical and chemical analyses of worn surfaces were conducted to study failure mechanisms. Digital ME tape exhibited higher overall durability than digital MP tape and Hi-8 ME tape without a diamond-like carbon (DLC) overcoat in the study. The performance of digital ME tape was sensitive to temperature and relative humidity. In the pause test, digital ME tape demonstrated highest durability under hot and moderate humidity conditions and lowest durability under cold and dry conditions. The reasons for high durability for digital ME tape compared with digital MP tape and Hi-8 ME tape without a DLC overcoat lie in lubricant selection, controlled surface topography and DLC coating. With the correct combinations of these three parameters, the durability of ME tape is vastly improved.

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“…The dual coated tape [1], [2] provided superior performance, which was attributed to its high magnetization and smooth surface. Even in the digital DV system, which helped spur spectacular advances in MP technology and in which only the dual coated type of tape was seriously tried, the reason for this choice lay mainly in system specifications of over-write level and some auxiliary long wavelength signal requirements.…”

Section: Introductionmentioning

confidence: 95%

Soft-magnetic underlayer for MP data tape

Veitch¹

2001

IEEE Trans. Magn.

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The high output at long wavelengths of MP tape causes problems with the nonlinear response of magneto-resistive reading elements. Thinner magnetic coatings would solve the problem but it is easier to add a soft magnetic underlayer to flatten the frequency response. Superparamagnetic maghemite is a suitable material for a particulate soft magnetic underlayer. It has the appropriate particle size and can be prepared in an easily dispersible form. Both the susceptibility and the saturation magnetization achieved in the coating are limited compared with continuous soft magnetic materials. However, the nonlinear saturating effect partly compensates the disadvantage of a low initial susceptibility, while at the same time limiting potential harm to the recording process.

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Developments and advances in thin layer particulate recording media

Cited by 37 publications

References 12 publications

Friction, wear and magnetic performance of metal evaporated and particulate magnetic tapes

Friction, wear and magnetic performance of metal evaporated and particulate magnetic tapes

Durability and failure mechanisms of digital tapes in a rotary tape drive

Soft-magnetic underlayer for MP data tape

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