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IEEE Transactions on Magnetics

Issue 2 • March 1978

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • Request queueing for magnetic bubble memories

    Publication Year: 1978, Page(s):37 - 40
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The improvements in request throughput that result from the use of the shortest seek time first (SSTF) request, scheduling algorithm for major/minor loop organized magnetic bubble memories are considered. For the satisfaction of read requests the bubble memory can be considered as equivalent to a file drum with fixed block size. Bubble memories are considered with 64 kbits per chip running at a 5.... View full abstract»

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  • Gap-tolerant half-disk bubble device margins

    Publication Year: 1978, Page(s):40 - 45
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A simple model is presented which allows accurate prediction of bias margins of gap-tolerant half-disk propagation tracks for bubble domains. After this is verified by comparison with experimental margin data, an "isomargin" plot is derived to show how the margin varies as a function of W and G , where View full abstract»

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  • Major-minor loop, single-level-masking bubble chip

    Publication Year: 1978, Page(s):46 - 49
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A major-minor loop chip design is presented which requires one high resolution masking step and no critical mask alignments. This design may therefore be implemented with electron-beam, X-ray, or deep-UV conformable-contact lithography to define the submicron linewidths required in ultra-high density devices. Chips with 20-μm period were fabricated with a layered Au-first, NiFe-second structu... View full abstract»

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  • The properties of X-bar bubble memory chips

    Publication Year: 1978, Page(s):50 - 55
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    The properties of a 16-kbit bubble memory chip having a conventional major-minor loop organization are described. The chip can be operated up to a shift rate of 300 kHz which corresponds to a mean access time of 0.5 ms to blocks of 128 bits. Overall bias field margins of 13 percent were obtained, especially as the result of an appropriately selected layout of the transfer gates which is described ... View full abstract»

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  • Spacing losses in finite track width reproducing systems

    Publication Year: 1978, Page(s):55 - 59
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The Fourier transforms of the three field components of a finite width reproducing head are derived and given in analytic forms. These formulas represent three-dimensional analogs of the familiar two-dimensional exponential spacing loss factor. The on- and off-track head response to a longitudinally magnetized track is computed from these results and compared with experimental measurements on regi... View full abstract»

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  • Forces and moments for electrodynamic levitation systems--Large-scale test results and theory

    Publication Year: 1978, Page(s):59 - 68
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1112 KB)

    The dynamic circuit theory for the analysis of the suspension characteristics of electrodynamic magnetic levitation schemes for realistic magnet and guideway configurations is reviewed. Electrodynamic forces and moments have been measured on a large-scale stationary superconducting magnet interacting with an aluminum strip mounted on the rim of a 7.6-m diameter rotating test wheel. Good agreement ... View full abstract»

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  • Joints in strips for electrodynamic magnetic levitation systems

    Publication Year: 1978, Page(s):69 - 75
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The force disturbances experienced by the superconducting magnets of an electrodynamically levitated vehicle due to guideway strip thermal expansion joints are studied. The experimental investigation covers the low, intermediate, and high speed ranges, and it is shown that the change in eddy current distribution at a guideway strip discontinuity, i.e., at a simple butt joint, can cause severe tran... View full abstract»

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  • Mechanically induced anisotropy and its effect on magnetic permeability in single crystal ferrites

    Publication Year: 1978, Page(s):76 - 81
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Magnetic anisotropy and initial permeability in worked Mn-Zn and Mn-Fe ferrite single crystals are investigated in connection with the average magnetostriction constant λs. These data are compared with those obtained for etched specimens. Induced anisotropy is observed for all of the worked specimens and is proportional to λs, i.e., its origin should be the magnetoe... View full abstract»

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  • Rayleigh hysteresis--A new look at an old law

    Publication Year: 1978, Page(s):81 - 84
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Experimental evidence is cited that, for very small hysteresis loops, the remanent magnetic flux density Bris not proportional to the square of the amplitude of the magnetic field excursion H1(as given by the Rayleigh relation), but rather to the first power. It is shown that (subject to one very general assumption), were this dependence exact, it would lead to negative hyste... View full abstract»

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  • Magnetic properties and noise in cylindrical Permalloy thin-film magnetometers

    Publication Year: 1978, Page(s):84 - 87
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The magnetic properties and low-frequency noise measurements of thin films of Permalloy are described. The films are obtained by electrodeposition. They are polycrystalline and single domain. The noise due to the film is shown to be an increasing function of the dispersion angle α90. A model for the noise mechanism taking into account the magnetostatic stray field arising in the gr... View full abstract»

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  • The geometry of regulating transformers

    Publication Year: 1978, Page(s):87 - 94
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Ferroresonant, ballast, and current-limiting transformers are similar in geometxy. Optimization of weight, losses, or cost can result in different choices for the shape (core or shell) and proportions of the lamination. In the ferroresonant transformer, the problem of saturation losses, noise and stray flux can be alleviated by altering the geometry to produce a magnetic circuit with nonuniform fl... View full abstract»

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  • [Back cover]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

IEEE Transactions on Magnetics publishes research in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage.

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Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology