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  • Articles  (5)
  • American Institute of Physics (AIP)  (5)
  • 1990-1994  (5)
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  • Articles  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Recording medium properties and capacity bounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5753-5755 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of such medium properties as magnetic unit size, film thickness, and strength of anisotropy, dipolar, and exchange interactions on the storage capacity limit of a thin-film recording medium is investigated. Relationships are derived for media with different properties that have equivalent capacity. The physically realizable range of material properties and their effect on the capacity bound are explored. Results on edge effects for capacity bound computations are presented. The results indicate that media for which anisotropy is the dominant source of magnetic energy have the greatest potential for information storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355604
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  • 2
    Electronic Resource
    Electronic Resource
    Intergranular exchange coupling (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2289-2290 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We evaluate the exchange interaction between neighboring grains of a polycrystalline magnetic material with uniaxial magnetocrystalline anisotropy, based on the energy of the domain wall formed at the portion of the interface in atomic contact. The analysis suggests that previous work [J.-G. Zhu and H. N. Bertram, in Solid State Physics Vol. 46, edited by H. Ehrenreich and T. Turnbull (Academic, San Diego, 1992)] may underestimate the interaction, and it predicts a different dependence on grain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356294
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  • 3
    Electronic Resource
    Electronic Resource
    dc track edge interactions : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4721-4723 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed an experimental method for investigating the interaction between two dc track edges by studying the track edge noise. We conclude that two edges do not interact when they are several micrometers apart, but the noise reduces nearly to zero when their separation is less than about half a micrometer. There is a transition region that exists between these two limits. The net track edge noise power from two dc edges is quantized, implying that in our experiment track edges interact around the complete revolution of the disk or not at all.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348259
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  • 4
    Electronic Resource
    Electronic Resource
    Track edge fluctuations (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4683-4685 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Track edge fluctuations on recording media affect signal-to-noise ratio and servo control, and can provide clues to the medium's magnetic microstructure. We write track edges on longitudinal thin-film magnetic recording media by dc erasing the medium and writing a saturated dc track of opposite magnetization direction on the erased band. We then "read'' the position fluctuations of the x-component reversal of one edge of the written track by centering a head on that edge, and by stepping the head across the edge. Since a straight track edge would not produce any flux change in the read head coil, the voltage output of the head arises from flux changes due to track edge fluctuations. The spectrum of the fluctuations can be deduced by decorrelating the read head sensitivity function from the voltage spectrum. We have used this procedure with several low- and high-noise thin-film media and we find in each case a k−b spectrum (k=wave number) with b near 1. We propose a model which interprets the fluctuations as a superposition of uncorrelated protuberances from a nominal straight edge, and we deduce the size distribution of the protuberances which will generate the observed fluctuation spectrum. Simulated reconstruction of the track edge resulting from a weighted superposition of the protuberances permits semiquantitative inferences to be drawn from the model about the medium microstructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344826
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  • 5
    Electronic Resource
    Electronic Resource
    An in situ measurement of intergranular coupling in magnetic film media (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2027-2028 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe an in situ nondestructive method to measure the intergranular coupling in magnetic thin film recording media based on Stoner–Wohlfarth switching theory [Philos. Trans. Roy. Soc. London A 240, 599 (1948)]. The method uses recording write and read heads and a disk test stand to measure a medium's remanence curves from saturation and demagnetization. Using this technique, we have measured Henkel plots [Phys. Status. Solidi 7, 919 (1964)] for single layer and multiple layer longitudinal media, as well as a Henkel plot for a perpendicular thin film with a highly permeable underlayer, which cannot be obtained by the conventional vibrating sample magnetometer method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353145
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