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IEEE Transactions on Magnetics

Issue 3 • Date May 1979

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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  • Magnetic bubble device scaling and density limits

    Publication Year: 1979, Page(s):1009 - 1016
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    Scaling of magnetic bubble devices to smaller bubble sizes and higher density is considered. Drive field requirements, materials requirements, fabrication requirements, current requirements, and detector signal-to-noise ratio are all calculated as a function of bubble size and related to practical limits imposed by bubble materials, fabrication techniques, and electromigration limits. It is conclu... View full abstract»

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  • Some characteristics of ion-implanted bubble chips

    Publication Year: 1979, Page(s):1016 - 1020
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1416 KB)

    The relations between the position of charged walls and the bubble motion around propagation circuits are discussed. Long walls which extend between adjacent propagation loops are revealed by the Bitter technique. The examination of the domain structure in the implanted layer shows the existence of a magnetic gradient which is a function of the distance from the propagation circuits. The switching... View full abstract»

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  • A simple method for computing wall twist in high-Q bubble materials

    Publication Year: 1979, Page(s):1021 - 1026
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    First-order perturbation of the one-dimensional structure for the wall surrounding a bubble domain, lead to a set of linear differential equations, which should determine the wall twist for any magnetic material with a large quality factor Q provided the wall is stationary. A first-order solution of these equations is given in terms of two linear integrals whose numerical evaluation is much simple... View full abstract»

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  • Analysis of gap-tolerant bubble circuits

    Publication Year: 1979, Page(s):1026 - 1031
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A technique is presented for the analysis of bubble propagating circuits using a numerical model previously discussed. Various gap-tolerant bubble circuits are analyzed using this model and potential well profiles are plotted. The analysis of these circuits clearly shows the advantages of the asymmetrical structures over the symmetrical ones. By postulating the various failure modes, bias margins ... View full abstract»

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  • On the theory of bubble domain motion in propagation circuits

    Publication Year: 1979, Page(s):1031 - 1046
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1776 KB)

    The stability conditions for a bubble domain in the fields of magnetostatic traps are analyzed. For this purpose the quasi-stationary equations of bubble motion are derived which take into account field nonuniformity across the bubble diameter. The contribution of the Permalloy overlay is considered qualitatively. The conditions of static and dynamic stability of trapped bubbles are studied and th... View full abstract»

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  • Record head saturation in AC bias recording

    Publication Year: 1979, Page(s):1046 - 1049
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The head core saturation problem in ac bias audio recording is analyzed. An approximate expression, which should be satisfied in order to avoid head saturation, is obtained in terms of head core saturation flux density Bm, gap length g, tape coercivity Hc, and tape coating thickness δ. Experimental verification is obtained by using various values of Bm,g,H... View full abstract»

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  • Effect of bitshift distribution on error rate in magnetic recording

    Publication Year: 1979, Page(s):1050 - 1053
    Cited by:  Papers (39)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A formalism is presented which relates the intrinsic error rate of a digital recording channel to measurable channel parameters: interpulse interactions and signal-to-noise ratio. Experimental data is provided to support the theoretical model. Implementation of the formalism allows clear identification of recording channel limitations and provides a method for determining the most reliable use of ... View full abstract»

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  • External bit field analyses

    Publication Year: 1979, Page(s):1054 - 1059
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Three-dimensional external bit fields emanating from single and multiple magnetic transitions with a finite track width have been calculated. The magnetic field interferences between tracks have been also simulated. The results show that the fields have a large component in the track width direction near the transition edges. This contributes to field extension in the neighboring track direction. ... View full abstract»

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  • Narrow track magnetic head fabricated by ion-etching method

    Publication Year: 1979, Page(s):1060 - 1064
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Manufacturing narrow track magnetic heads is difficult as track widths become very narrow. A new flying-head manufacturing method is established by applying ion-etching. Optimum conditions for ion-etching of the ferrite material were determined. More than 10 μm ion-etched depth and even less than 5 μm track width were obtained. Through experimental and theoretical evaluation, it is prove... View full abstract»

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  • Magnetostriction and stress-induced playback loss in magnetic tapes

    Publication Year: 1979, Page(s):1065 - 1067
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A direct correspondence between magnetic tape playback level, stress-induced remanence loss, and magnetostrictive properties of corresponding magnetic oxides has been observed. From these results the amount of playback loss was estimated by stressing a short segment of tape, by measuring magnetostriction in compacts of magnetic pigments or by an analysis of the Fe2+and Co2+co... View full abstract»

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  • Influence of reduction temperature on coercivities, coercivity factors and rheological properties of γ-Fe2O3and silica coated γ-Fe2O3

    Publication Year: 1979, Page(s):1068 - 1072
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The transformation of α-FeOOH into γ-Fe2O3via Fe3O4is studied in order to determine the influence of the reduction temperature on the magnetic and rheological properties of the final product. The study was carried out both on pure and on silica coated α-FeOOH. It was found that the reduction temperature at which a maximum of coercivity is ... View full abstract»

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  • Mechanical properties of barium hexaferrites

    Publication Year: 1979, Page(s):1072 - 1074
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The mechanical properties of typical isotropic barium ferrites have been determined. A statistical analysis has shown that fracture toughness is the best quality parameter. It changes with variation of production operation conditions. The fracture statistics follows the Weibull distribution. A relationship is found between the influence of the Fe2O3/BaO molar ratio on mechani... View full abstract»

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  • Computational methods for solving static field and eddy current problems via Fredholm integral equations

    Publication Year: 1979, Page(s):1075 - 1084
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    Two-dimensional static field problems can be solved by a method based on Fredholm integral equations (equations of the second kind). This has numerical advantages over the mote commonly used integral equation of the first kind. The method is applicable to both magnetostatic and electrostatic problems formulated in terms of either vector or scalar potentials. It has been extended to the solution of... View full abstract»

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  • Computer-aided design of air-gapped magnetic core inductors with minimum DC winding resistance

    Publication Year: 1979, Page(s):1085 - 1096
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The method of computer-aided design of air-gapped inductors operating with de bias current is described. An algorithm for the minimum de resistance of the winding for a desired value of the inductance is given. Simultaneously, this permits us to determine the optimal length of the air gap, to choose a suitable operating point on the normal magnetization curve and to calculate the minimum number of... View full abstract»

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  • Applications of multiterminal representations to magnetic fields

    Publication Year: 1979, Page(s):1096 - 1102
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    A graph-theoretic approach to the formulation of discrete models of magnetic field problems with special emphasis on the application of multiterminal representations is presented. The discrete model is obtained directly from the physics of the field, thus obviating the need for the usual intermediate analytical formulation (partial differential equation, energy functional, etc.). Further, the disc... View full abstract»

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  • Moments and force densities of the electrodynamic levitation system

    Publication Year: 1979, Page(s):1102 - 1108
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Theoretical predictions of the moments and the force density distributions on the superconducting magnet and on the conducting sheet guideway are given for the reference levitation system design proposed for the Canadian Maglev vehicle. The theoretical method is based on the Lorentz force, \tilde{J} \times \tilde{B} and the solution follows from a combination... View full abstract»

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  • Correction to "Absolute instability of magnetostatic surface waves interacting with drifting carriers in closed ferrite-semiconductor structure"

    Publication Year: 1979, Page(s): 1109
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 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