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IEEE Transactions on Magnetics

Issue 6  Part 1 • Nov. 1991

 This issue contains several parts.Go to:  Part 2 

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Displaying Results 1 - 12 of 12
  • Magnetic Recording Conference TMRC91 [Front cover of Transactions]

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (72 KB)
    Freely Available from IEEE
  • Gradient coils and reciprocity

    Publication Year: 1991, Page(s):4398 - 4399
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    It is observed that the problem of optimizing the design of gradient coils is identical to the problem of optimizing the design of vibrating sample magnetometer (VSM) pick-up coils. The problem of optimizing the design of the gradient coils is that of maximizing the appropriate field gradient at the position of the magnetic sample depending on the design of the alternating gradient magnetometer (A... View full abstract»

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  • Electromagnetic deceleration of metallic spheres

    Publication Year: 1991, Page(s):4400 - 4403
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB)

    The author reports the results of an approximate model of the potential of static magnetic fields, producible by permanent magnets, to decelerate spherical metal samples by eddy currents induced in the materials. It is assumed that the velocity of the sample is low enough that the magnetic field diffusion time is significantly less than the time required for the samples to pass through a half cycl... View full abstract»

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  • A differential equation approach to minor loops in the Jiles-Atherton hysteresis model

    Publication Year: 1991, Page(s):4404 - 4406
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (307 KB)

    The reason for the failure of the differential equations to yield physical minor loops involved in the magnetization in ferromagnetic materials is explained. A modified solution for minor loops is presented which retains the features of D.C. Jiles and D.L. Atherton's (1983) original motor loops, but only requires knowledge of the initial point on each portion of the loop to obtain the solution. Th... View full abstract»

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  • Ferrite core loss for power magnetic components design

    Publication Year: 1991, Page(s):4407 - 4415
    Cited by:  Papers (67)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (789 KB)

    A practical method is presented for computing high-frequency ferrite core losses in the magnetic component for arbitrary voltage waveforms. The model presented requires only a few material parameters as input. To calculate ferrite hysteresis losses, a model based on empirical rules is employed. For high-frequency eddy current losses, a built phenomenon is assumed. It is demonstrated that the hyste... View full abstract»

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  • Eddy current testing of anomalies in conductive materials. I. Qualitative imaging via diffraction tomography techniques

    Publication Year: 1991, Page(s):4416 - 4437
    Cited by:  Papers (30)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2155 KB)

    The authors consider the analysis of eddy current testing of defects in conductive materials. The authors investigate the application of reflection-mode diffraction tomography (DT) imaging techniques. First, exact synthetic data are calculated for various canonical configurations using a method of moments, and they are compared with those calculated by a finite-element code and with experimental d... View full abstract»

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  • Numerical evaluation of singular matrix elements in three dimensions (Maxwell equations)

    Publication Year: 1991, Page(s):4438 - 4444
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (518 KB)

    In using the moment method to get approximate solutions of Maxwell's equations, the matrix elements are usually expressed as integrals involving a singular kernel. Numerical evaluation of the matrix requires special consideration where the singularity is of high order. The question addressed is how best to compute matrix elements in the presence of this strong singular term for a discrete system d... View full abstract»

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  • Finite element analysis of fault current interrupter for pad-mounted switchgear package

    Publication Year: 1991, Page(s):4445 - 4451
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (602 KB)

    The author presents the results of a numerical analysis of a magnetic sensor device for a resettable vacuum fault interruption system. It uses a force generated between the connecting bus and a steel element which can drive the trip rod. The force acting on the steel members of the device is generated by the magnetic field around the connecting bus. The field distribution is determined by the fini... View full abstract»

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  • Effect of magnetic annealing on plated permalloy and domain configurations in thin-film inductive head

    Publication Year: 1991, Page(s):4452 - 4457
    Cited by:  Papers (13)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The magnetic annealing behavior of electroplated, 2.00- mu m-thick, NiFe films containing nominally 82% Ni, in the temperature range from 100 to 500 degrees C, was investigated through characterization of the structural properties of full films and the domain configurations of films shaped like an inductive-head yoke. A transition in the magnetic properties of the films was observed in the tempera... View full abstract»

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  • Head sensitivity function determined from recording measurements

    Publication Year: 1991, Page(s):4458 - 4460
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The authors present a novel approach to measuring the response of a recording head used with a hard disk to form a recording system. The technique can be implemented on any test stand used for recording measurements using standard instrumentation with minor modifications to the write electronics. The resolution across the track width is about 0.5 mu m, and the head-media separation is controlled i... View full abstract»

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  • An experimental study of a write equalizer for unbiased digital magnetic recording

    Publication Year: 1991, Page(s):4461 - 4463
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (265 KB)

    The authors describe the results of an experimental study of a write pulse slimming technique for an unbiased digital magnetic recording channel. It is compared with the usual replay equalization technique implemented by tapped delay lines. The similarities and differences of the two techniques are pointed out. A practical advantage of this equalizer is that it can easily be built inside the write... View full abstract»

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  • Improvement on error rate performance for FM recording code

    Publication Year: 1991, Page(s):4464 - 4469
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    A partial response (PR) equalization technique for an FM recording code is proposed. First, the noise power spectrum and the eye patterns at the discrimination point for the PR system are compared with those for Veillard's system. Then, the bit-error rates of bit-by-bit decoding and Viterbi coding for these systems are obtained by computer simulation. The results show that the PR system has improv... 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.

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Meet Our Editors

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