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  • 1
    Electronic Resource
    Electronic Resource
    Rheology of the Lower Critical Ordering Transition (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 1129-1134 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00108a047
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  • 2
    Electronic Resource
    Electronic Resource
    Rheomagnetic measurements on suspensions of magnetic recording particles (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3770-3777 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurement of magnetic particle flow orientation properties is of considerable practical and fundamental interest as it relates to the particulate recording tape and disk manufacturing industry. For production of high-quality magnetic tapes and disks, the suspension must be well dispersed. Previous study focused on rodlike single-domain magnetic particles for longitudinal magnetic recording. In contrast, platelike particles are considered here for use in perpendicular recording. Both theory and experiment have demonstrated that a magnetic sensing technique employed to measure the hydrodynamic orientation provides a measure of the flocculation state for rodlike magnetic particle suspensions. Here the previous theory is extended and new experimental results are shown to demonstrate that the hydrodynamic orientation measurement apparatus can also be used to measure the flocculation state of platelike particles. The key new experimental result is the contrast between the flow orientation properties of the rod versus the platelike particles. Rodlike single-domain particles orient parallel to the flow direction causing the suspension magnetic permeability parallel to the flow direction to decrease with increasing flow rate. In the case of the platelike Ba-ferrite particles, the opposite behavior is observed. As the flow rate is increased, the particles orient with their flat side parallel to the flow direction causing the suspension magnetic permeability parallel to the flow direction to increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352272
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  • 3
    Electronic Resource
    Electronic Resource
    Pin-on-disk tribology of thin-film magnetic recording disks (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2706-2711 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tribological studies of friction and wear were performed on carbon overcoated thin-film magnetic recording media with pin-on-disk tests. Scanning microellipsometry was employed to measure the wear of carbon overcoats on rigid magnetic media. Severe wear produced after the carbon film wore through was measured by mechanical profilometry. The wear rate of the carbon is three orders of magnitude lower than that of the underlying metallic layers and is nearly proportional to slider load. Micrographs of the wear tracks and the magnitude of the wear coefficient from the Archard wear equation indicate three-body abrasive wear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344240
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Prediction of optical disk tracking servo signals from surface microtopography measured by scanning tunneling microscopy (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 993-995 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Scanning tunneling microscopy (STM) was employed to measure the three-dimensional surface topography of radial servo grooves etched in a glass substrate. The effect of groove depth (nominal values of 20, 40, and 70 nm) on tracking servo signals at a track pitch of 1.6 μm is examined. Using an optical disk tester, three groove related signals were measured for each groove depth: the on-track signal ratio, cross-track ratio, and the push-pull ratio. In a key feature of this study, scalar diffraction theory was used to calculate the groove related signals from the STM profiles and the beam profile of the optical disk tester. The calculated groove related signals were found to be in nearly quantitative agreement with those measured with the disk tester.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141990
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  • 5
    Electronic Resource
    Electronic Resource
    Polarization of an organic monomeric glass (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3242-3244 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A methylene dihydropyridine with a high ground-state dipole moment was investigated to explore the possibility of using it to form an organic monomeric glass "electret" film. Measurements were done in a specially designed test cell. An electric field was applied to a 100-μm-thick film of dihydropyridine while cooling from a melt. The cell potential was recorded as a function of time to study the homocharge and polarization relaxations. The homocharge relaxation time was (approximate)900 s. The polarization relaxation time was (approximate)2×105 s in the vicinity of the glass transition temperature. The polarization is linear over a wide range of electric field strength. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120303
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  • 6
    Electronic Resource
    Electronic Resource
    Ellipsometric measurement of solid fluorocarbon film thickness on magnetic recording media : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5378-5380 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Solid fluorocarbon films were deposited on carbon overcoated magnetic recording media. The films were made by direct ion beam deposition of fluorocarbon monomers. This paper presents ellipsometric measurements on films over a range of thickness from 0.5 to 12.5 nm. Film thickness was measured using ellipsometry, and the chemical composition was studied using x-ray photoelectron spectroscopy (XPS). A high-speed ellipsometer was set up to map thickness over the whole media surface. The ellipsometric angle Δ was found to be linearly related with the film thickness. Since the escape depth of the XPS is comparable to the film thickness, the XPS senses the underlying carbon as well as the carbon in the film. As a result, the apparent ratio of fluorine to carbon depends on the film thickness. The ion beam deposition technique can be used to produce films with controlled thickness and uniform composition. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364573
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  • 7
    Electronic Resource
    Electronic Resource
    Surface potential of thin perfluoropolyether films on carbon (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 52-54 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Perfluoropolyether (PFPE) films for lubrication of thin film magnetic recording media are made progressively thinner and their physical properties are increasingly dominated by molecular interactions with the carbon overcoat. Surface potential measurement is one of a few techniques to study the interaction of ultrathin films with surfaces. A scanning Kelvin probe apparatus with spatial resolution of 100 microns and potential sensitivity of 0.5 mV was employed to study the surface potentials of linear and branched PFPE films with methyl, hydroxyl, phenyl ester, and carboxylic acid end groups on amorphous hydrogenated carbon surfaces. The surface potential is dominated by polar groups rather than the PFPE monomers. Application of the scanning surface potential technique to measure the migration of PFPE films is also shown. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119466
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  • 8
    Electronic Resource
    Electronic Resource
    A lower critical ordering transition in a diblock copolymer melt (1994)
    [s.l.] : Nature Publishing Group
    Nature 368 (1994), S. 729-731 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The microphase separation of block copolymers has been of scientific and technological interest for many years1'2 because of the increasing use of diblock copolymers as surfactants, impact modifiers and adhesives. Simple homopolymer mixtures phase-separate macroscopically; however, the linking of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/368729a0
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  • 9
    Electronic Resource
    Electronic Resource
    Lateral migration of a rigid sphere in torsional flow of a viscoelastic fluid (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 631-636 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A single polystyrene sphere of radius a, between 141 and 275 micron, when in jected into a disk-plate (torsional) flow of polybutene (viscosity 36 poise, Mn ∼680), migrates radially inward at a rate that is dramatically increased by dissolving 1% of a high-molecular-weight polyisobutylene (Mv ∼106) to make the fluid viscoelastic. The torsional flow field was created by rotating a 21-cm-diameter disk at a rate ω of 6-9 rpm with a gap H of 3.7-5.4 mm between this and a ground glass plate with the fluid in the gap. Lateral migration toward a lower shear rate increased with increasing shear rate and with increasing shear rate gradient in the manner predicted by Brunn (1976) or Chan and Leal (1977). Shear rates up to 25 s-1 were investigated. Below a shear rate of 8 s-1 the radial migration velocity is of the form vr = - L(ωa/H)2r, where L is a positive constant containing the fluid properties, and r is the radial position of the particle.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300414
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of dispersion quality on particulate magnetic recording disk properties (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 394-402 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The production of particulate magnetic disks or tapes requires consistent and uniform magnetic characteristics over the entire disk or tape to have as few defects as possible. To achieve this goal, the magnetic particle suspension used to coat the disk must be well dispersed. This article describes the use of a rheomagnetic instrument that provides an indirect measurement of the dispersion quality prior to coating application. The instrument was designed, tested, and put on a manufacturing scale line to characterize the relationships between the measured dispersion quality and functional characteristics of the magnetic coating. The results of tests done during scaleup for production yielded a qualitative correlation between the in-situ measurements made on the magnetic particle suspension at the coater with the surface roughness due to flocs, the on-disk orientation ratio, and the signal to noise ratio. The current results are the first demonstration of the dispersion quality measurement in a practical manufacturing environment.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370310
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