IEEE Transactions on Magnetics

Issue 4 • July 1979

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Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • High-frequency propagation and failure of asymmetric half-disk field access magnetic bubble device elements

    Publication Year: 1979, Page(s):1113 - 1120
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1432 KB)

    High-frequency propagation characteristics and failure modes in 14-μm period, 1.8-μm gap, asymmetric half-disk field-access device were studied using a high-speed optical sampling technique. Propagation elements as well as normal and hand gun corners and chevron structures were included. The operating bias margin at 1MHz, for a structure that had 1.2 MHz as highest possible frequency, wa... View full abstract»

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  • Optoelectrical study of bubble propagation in field access devices

    Publication Year: 1979, Page(s):1120 - 1123
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Bubble propagation on several field access structures is studied with an optoelectrical method. Measurements were performed with a 40-Oe, 10-kHz rotating field on closed-loop shift registers that were fabricated on Bi-substituted garnet films having either 7 μm or 2.7 μm bubbles. The effect of increasing the interelement gap for several nonsymmetrical structures is discussed. View full abstract»

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  • High density recording with write current shaping

    Publication Year: 1979, Page(s):1124 - 1130
    Cited by:  Papers (5)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A digital magnetic recording system is described that doubles the linear data bit density of an existing head/medium interface. It uses the combination of the following three techniques: an efficient new run-length limited code (3PM), a special kind of ac-bias recording, and pulse slimming by write current shaping. The new code has the inherent potential of increasing linear data density over MFM ... View full abstract»

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  • High track density thin-film tape heads

    Publication Year: 1979, Page(s):1130 - 1134
    Cited by:  Papers (6)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    A short review of thin-film write heads, all formed on magnetically flat substrates, is given, and properties of the several types are discussed. A novel structure is proposed to avoid many disadvantages of the former heads. It is formed on a magnetically grooved but physically planar substrate. Measured and calculated characteristics are given for this new configuration for which the name "groove... View full abstract»

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  • Sputtered multilayer films for digital magnetic recording

    Publication Year: 1979, Page(s):1135 - 1137
    Cited by:  Papers (32)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Layered films of cobalt over chromium deposited by dc sputtering onto heated substrates exhibit magnetic properties suitable for digital saturation recording. A cobalt layer of a few tens of nanometers thickness deposited over a chromium layer of several hundred nanometers has coercivity between 1100 and 300 Oe and remanence-thickness product between 0.014 and 0.07 G.cm with squareness between 0.7... View full abstract»

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  • A new permanent magnet material: Modified Ca ferrite

    Publication Year: 1979, Page(s):1141 - 1146
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    An experiment was carried out to investigate the preparation condition of anisotropic Ca system ferrite magnets with optimum magnetic and physical properties. Compositions were chosen according to the formula (CaO.nFe2O3)100-x(La2O3)x, wherexwas varied between 0 and 4.0, and n between 5.5 and 6.25. The optimum condition o... View full abstract»

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  • The hall cross in a perpendicular inhomogeneous magnetic field

    Publication Year: 1979, Page(s):1138 - 1141
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Equations are derived which give the voltage that is generated in a Hall conductor when an inhomogeneous magnetic field is applied normal to the plane of the Hall conductor. These equations are used to solve a specific example of a Hall cross in such a field, using finite difference techniques. The results are shown to be in excellent agreement with measured data. View full abstract»

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  • Formation and magnetic properties of Fe-B-Si amorphous alloys

    Publication Year: 1979, Page(s):1146 - 1149
    Cited by:  Papers (101)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The magnetic properties and crystallization temperatures of alloys in the ternary Fe-B-Si system are reported. The Curie temperature increases slightly on replacement of boron by silicon. This results in a sharp ridge of relatively constant room-temperature saturation magnetization extending from Fe80B20to Fe82B12Si6. The coercivity exhibits a... View full abstract»

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  • Ribbon-form sendust alloy

    Publication Year: 1979, Page(s):1149 - 1153
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1025 KB)

    Ribbon samples near the Sendust compositionxFe,ySi,zAl (9.12 wt%leq y leq 9.98wt%, 4.88 wt%leq z leq 5.88wt%) were prepared by rapid quenching techniques. The ribbons were about 40 μm in thickness, 2 mm in width, and 20 m in length. These ribbons were flexible, and it was possible to wind them around a rod 15 mm diameter, The density and ... View full abstract»

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  • An anomalous magnetoelastic effect in nickel

    Publication Year: 1979, Page(s):1154 - 1157
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A new magnetoelastic effect in nickel has been found that led us to modify some current theories about magnetization processes in weak fields. A longitudinal compression in Ni decreases its magnetization instead of increasing it. This behavior can be explained by a weak field spin rotation model, as opposed to the usual domain-wall motion theory. The important role played by residual stresses has ... View full abstract»

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  • Propagation velocities of normal zones in a forced-flow cooled superconductor

    Publication Year: 1979, Page(s):1158 - 1168
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    Propagation characteristics of normal zones in a forced-flow cooled superconductor (FFCS) are investigated by analyzing the thermal equilibrium equations. If the amount of energy of a disturbance to which an FFCS is subject is small enough, the conductor recovers to the superconductive state; however, if it is large, a normal zone remains and propagates. The analyses are presented with non-dimensi... View full abstract»

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  • The validity and the limitations of the AC impedance- modeling technique in electrodynamic levitation systems

    Publication Year: 1979, Page(s):1169 - 1174
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Because the impedance-modeling technique is such a convenient tool, it is used often (and sometimes incorrectly) for the prediction of forces in electrodynamic levitation systems. In spite of its widespread applications, the technique rests on flimsy theoretical foundations. This paper presents force formulas, derived from the dynamic circuit theory, which establish both the validity and the limit... View full abstract»

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  • Induction heating of circular ferromagnetic plates

    Publication Year: 1979, Page(s):1174 - 1181
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The induction heating of circular ferromagnetic plates is studied to predict power levels under various excitation conditions. A detailed and accurate analysis based on a unique "noninteraction" approximation is presented. A lumped parameter transformer model is developed with the nonlinear equivalent disk resistance expressed as a function of the terminal variables in the system. The transformer ... View full abstract»

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  • Frequency response function of a gapped infinite length pole piece recording head

    Publication Year: 1979, Page(s):1181 - 1183
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The frequency (wavelength) response function of a gapped infinite length, infinite permeability magnetic reproduce head is calculated analytically. View full abstract»

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  • A bubble string comparator for information processing

    Publication Year: 1979, Page(s):1183 - 1185
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A new magnetic bubble device is proposed: the bubble string comparator. It performs the sorting of couples of data without any logical control, depending only on the nature of the couples themselves. By means of an external control the bubble string comparator can also operate as a standard binary switch, either in bypass mode or in cross-over mode. View full abstract»

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  • Correction to "Magnetic traction force in an HGMS with an ordered array of wires: I"

    Publication Year: 1979, Page(s): 1185
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1979, 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.

Full Aims & Scope

Meet Our Editors

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