Open Research Exeter (ORE) will be unavailable from 8am - 9am Tuesday 1st September 2015 for essential maintenance. Apologies in advance for the inconvenience. Exeter IT

Now showing items 1-12 of 12

  • Accuracy of expressions for the magnetic field of a ring head 

    Middleton, Barry K.; Aziz, Mustafa M.; Miles, J. J. (IEEE, 2000)
    The Fourier method used by Fan has produced a representation of the field of a semi-infinite pole head consisting of a simple analytical approximation (Karlqvist field) plus an infinite series of correction terms. A method ...
  • An analytical model of the vector digital magnetic recording process in isotropic thin media 

    Middleton, Barry K.; Miles, J. J.; Aziz, Mustafa M. (IOP PUBLISHING LTD, 2001)
    An analytical theory has been produced for describing the vector nature of the digital magnetic recording process in thin-film isotropic media. It is based upon assumptions on the way in which the magnetization follows the ...
  • Autocorrelation analysis of particle magnetization in erased particulate media. 

    Aziz, Mustafa M.; Middleton, Barry K.; Miles, J. J. (IEEE, 2002)
    General analytical expressions for the magnetization power spectral densities of particulate media are derived by using the three-dimensional autocorrelation function. Expressions include the effects of AC demagnetized ...
  • Correlations and noise in magnetic recording media 

    Aziz, Mustafa M.; Middleton, Barry K.; Miles, J. J. (IEE-INST ELEC ENG, 2003-09)
    A theory is presented which predicts the role of interparticle correlations in determining the magnetisation power spectral densities within magnetic recording media in the absence of recorded signal magnetisation. Magnetic ...
  • Exact harmonic coefficients for a magnetic ring head 

    Wilton, David T.; Middleton, Barry K.; Aziz, Mustafa M. (IEEE, 1999)
    The magnetic field of a ring head has been analyzed by Westmijze [1953], using a conformal mapping, and by Fan [1961], using Fourier techniques. Here these methods are reexamined and combined to give, for the first time, ...
  • Hysteresis loops and transition shapes during recording 

    Middleton, Barry K.; Aziz, Mustafa M.; Miles, J. J. (IEEE, 2000)
    Hysteresis loop shapes corresponding to particular recorded transition shapes are calculated self-consistently. It is found that the closer a ramp function comes to the shape of the transition, the squarer the hysteresis ...
  • Medium magnetizations for longitudinal high-density digital recordings 

    Middleton, Barry K.; Aziz, Mustafa M.; Speliotis, D. E. (IEEE, 2003)
    This paper reports on the influences of magnetic media remanent magnetizations on the output levels in digital magnetic tape and disk recording. While at low densities a high magnetization is required for a high output, a ...
  • Particle distributions and noise in metal particle tapes 

    Aziz, Mustafa M.; Middleton, Barry K.; Miles, J. J. (IEEE, 2002)
    The magnetization spectrum from an erased (ac demagnetized or dc saturated) particulate medium was derived analytically using the autocorrelation function of a long line of separate and contiguous particles. The derived ...
  • Recorded magnetization distributions in thin film disk media 

    Middleton, Barry K.; Aziz, Mustafa M.; Wdowin, M.; Miles, J. J. (IEEE, 1998)
    The magnetization distributions in recorded transitions in thin film disk media are shown to consist of simple longitudinal magnetization transitions along with flux closure patterns. Together they give rise to the familiar ...
  • Signal and noise characteristics of patterned media 

    Aziz, Mustafa M.; Wright, C. David; Middleton, Barry K.; Du, Huan; Nutter, Paul (IEEE, 2002)
    Analytical expressions of the replay spectra from single- and multiple-recorded bits in patterned media have been derived. The expressions were extended to include position jitter noise and bit-size variations.
  • Signal-to-noise ratios in recorded patterned media 

    Aziz, Mustafa M.; Middleton, Barry K.; Wright, C. David (IET, 2003)
    The replay flux from isolated and sequences of recorded patterned elements was analysed and analytical expressions for the replay spectra were derived. The noise arising from bit size variations and bit position jitter has ...
  • Switching times and transition widths in digital recording theory 

    Middleton, Barry K.; Miles, J. J.; Aziz, Mustafa M. (IEEE, 2001)
    Calculations are carried out to show the effects of finite switching times of head fields and of recording media on recorded transition widths. In both cases the transition widths are increased and these effects are captured ...