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IEEE Transactions on Magnetics

Issue 5 • Date Sep 1993

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Displaying Results 1 - 17 of 17
  • An approach to recording on tilted media

    Publication Year: 1993, Page(s):2258 - 2265
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    A simple model for recording on media with a tilted anisotropy axis is proposed. The model combines the slope theory (Williams and Comstock model) with vectorial aspects of the head fields, their corresponding gradients and the angular dependence of the switching fields of the medium. In the case of obliquely deposited metal evaporated tape, the model is shown to predict the experimental data corr... View full abstract»

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  • Safety and protection of 8 T NbTi gyrotron magnet in persistent mode

    Publication Year: 1993, Page(s):2238 - 2243
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    To achieve high mechanical stability of a superconducting winding, numerical stress-strain analyses of the winding structure and appropriate stress-strain analyses of the winding structure and appropriate epoxy-impregnation technology were applied. To improve further winding mechanical stability, an initially round 1-mm-diameter varnish-insulated conductor was flattened to rack-track cross section... View full abstract»

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  • Linear AC magnetic circuit theory

    Publication Year: 1993, Page(s):2207 - 2212
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    A theory is presented for linear, AC magnetic circuits. The theory develops real and imaginary reluctance terms, which are used in the same manner as real and imaginary impedance terms in linear, AC electrical circuit theory. The reluctance terms can be manipulated through coil-coupled resistances and capacitances. The theory is applied to a parallel magnetic-circuit configuration to show the limi... View full abstract»

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  • On the application of moment methods to electromagnetic nondestructive evaluation

    Publication Year: 1993, Page(s):2244 - 2250
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The application of moment methods (MMs) to eddy-current testing problems for nondestructive evaluation (NDE) is considered. A general formulation for the MM that can be used to analyze NDE problems is derived, and calculated results and experimental data obtained from eddy-current testing of an artificially made sample are presented. Good agreement between the calculated results and the experiment... View full abstract»

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  • Reciprocity principles for magnetoresistive heads

    Publication Year: 1993, Page(s):2279 - 2285
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A generalized reciprocity principle for magnetoresistive (MR) heads is derived. The results apply primarily to the linear (small signal) reproduce performance of any MR head type (shielded or unshielded, single or multiple active MR elements) of arbitrary three-dimensional geometry. Reciprocity principles provide a powerful technique for calculating the intrinsic sensitivity function that is chara... View full abstract»

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  • Magnetic structure design method

    Publication Year: 1993, Page(s):2228 - 2231
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The method described provides a simple procedure for the design of structures intended to generate a magnetic field that follows a specific variation law in an air gap. The emphasis is on design rules derived from well known theorems such as the superimposition principle, the easy axis rotation theorem, and the image theorem. An example is given for a linear displacement sensor application. Magnet... View full abstract»

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  • Digital recording theory for thick media

    Publication Year: 1993, Page(s):2286 - 2288
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The familiar theories of digital recording (such as that of Williams and Comstock) which apply to thin films are extended to apply to thick media. The result is a theory which is able to predict variations of transition widths through the depths of the media, making it more widely applicable View full abstract»

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  • Formulas for the force and torque of axial couplings

    Publication Year: 1993, Page(s):2295 - 2301
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Closed-form expressions are presented for computing the force and torque that is transmitted by synchronous axial couplings. These expressions enable rapid parametric studies of coupling performance relative to the selection of magnet material, dimensions, and spacings. They are also useful for testing three-dimensional numerically based field algorithms. The derived expressions are tested here us... View full abstract»

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  • Magnetoresistive sensors with rapidly solidified Permalloy fibers

    Publication Year: 1993, Page(s):2251 - 2257
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The microstructure and properties of Permalloy fibers were studied. Both transverse and longitudinal extraordinary magnetoresistive effects have a positive initial slope due to stress-related rotation of moments in the closure domains and to the coherent rotation of moments in the columns. Fiber response was also investigated as a function of the field direction and angle of incidence, fiber twist... View full abstract»

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  • Characteristics of a thin film microtransformer with circular spiral coils

    Publication Year: 1993, Page(s):2232 - 2237
    Cited by:  Papers (44)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A thin-film 3.14-mm×3.88-mm microtransformer has been fabricated, using photolithography technology, to support high-frequency switching regulators. The microtransformer is composed of sputtered amorphous magnetic layers, electroplated copper windings with 20-μm width, and insulator layers. The coupling factor between the primary and secondary windings of the microtransformer is 0.97 for ... View full abstract»

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  • Magnetostatic image theory for an arbitrary current loop in front of a permeable sphere

    Publication Year: 1993, Page(s):2202 - 2206
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Magnetostatic image theory recently introduced for the problem of a circular current loop in front of a permeable sphere centered on the axis of the loop is generalized to the case of an arbitrary current loop outside the sphere. The theory is derived by finding the image for a current element outside the sphere. As an application, the image for a straight line current is seen to result in a surfa... View full abstract»

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  • Calculation of an electromagnetic field in a three-phase induction pump with a compensating winding

    Publication Year: 1993, Page(s):2289 - 2294
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A three-phase inductor which generates a magnetic traveling field is often used in induction liquid metal pumps. Due to the finite length of the inductor an alternating magnetic field component occurs, which should be compensated. An analysis of the electromagnetic field of an induction pump with a rectangularly shaped transport channel and a flat three-phase inductor possessing a compensating win... View full abstract»

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  • Anisotropic stress in window-plated Permalloy thin films

    Publication Year: 1993, Page(s):2266 - 2272
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Measurements of stress have been made in window-plated strips of Permalloy with different aspect ratios and the results have been related to finite-element simulations. It is found that the in-plane stresses in the window-plated strips are similar to those expected in strips fabricated from a sheet film with an initial biaxial stress state. The effect of annealing the strips is to increase the dif... View full abstract»

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  • Media requirements and recording physics for high density magnetic recording

    Publication Year: 1993, Page(s):2185 - 2201
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1660 KB)

    Relevant aspects concerning the ultimate achievable recording densities for particulate as well as for thin-film media are discussed. This review covers the entire range starting from micromagnetics of individual single domain particles, moving on to their magnetic behavior in a particle assembly under particular consideration of the structure being actually obtained in the process of manufacturin... View full abstract»

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  • Magnetic circuits classification

    Publication Year: 1993, Page(s):2221 - 2227
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A classification of magnetic circuits is proposed. It is based on the circuit's working geometry, its components (magnets, pole pieces, yokes), and the nature of its source (dipole, quadrupole, multipole). Examples of conventional devices and recent developments are given for the different classes considered View full abstract»

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  • On plane magnetic fields in saturable materials

    Publication Year: 1993, Page(s):2213 - 2220
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The equations governing two-dimensional flux and potential fields in nonlinear soft magnetic materials can be converted into a pair of linear conditions by means of a Legendre transformation. On this basis and for certain classes of constitutive equations, exact solutions are found that describe configurations such as plane multipole fields and fields near corners and edges. In case of perfectly s... View full abstract»

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  • Influence of the magnetic after-effect (MAE) on the frequency dependence of the complex initial susceptibility: a tutorial approach

    Publication Year: 1993, Page(s):2273 - 2278
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The theory of the complex initial susceptibility in the presence of a magnetic aftereffect (MAE) is treated, with special attention paid to the case of a MAE of the stretched exponential type. This case is of importance for the study of the initial complex susceptibility in complex correlated systems, which present an MAE of a nonsimple exponential nature View full abstract»

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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