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IEEE Transactions on Magnetics

Issue 1 • Date March 1974

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Magnetooptical properties of ferrimagnetic CoCr2S4in the near infrared

    Publication Year: 1974, Page(s):2 - 7
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    CoCr2S4, which is a ferrimagnetic insulator, has been prepared by hot-pressing microcrystalline powder. The infrared magneto-reflectance effects have been measured at several temperatures below the transition temperature of 221K. Very large Kerr effects, which are centered at 1.0 and 1.7 μm, have been associated with the principal crystal field transitions of divalent co... View full abstract»

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  • Electromagnetic coupling between two parallel layers of yttrium iron garnet for microwave device applications

    Publication Year: 1974, Page(s):7 - 11
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    An X band microwave filter consisting of two microwave cavities attached and orthogonal to each other with a YIG-GGG-YIG sample in a sandwich configuration has been designed and tested. Normally the two cavities do not couple electromagnetically to each other, but do couple through the sandwich configuration. The sandwich configuration is placed in between the t... View full abstract»

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  • Wave propagation along domain walls in magnetic films

    Publication Year: 1974, Page(s):11 - 17
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    It is shown by theoretical analysis that domain walls can support two different types of waves denoted as "magnetostatic interface waves" and "wall displacement waves". The magnetostatic interface waves are similar in character to magnetostatic surface waves. The wall displacement waves are analogous to displacement waves on strings and to capillary waves on the surface of liquids, Dispersion rela... View full abstract»

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  • "Lorentz" microscopy of stripe domain films with protons

    Publication Year: 1974, Page(s):18 - 22
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    A new method is reported for observing the in-plane component of magnetic structure in stripe domain films. Stripe domain films act as a Faraday-effect diffraction grating, and deflect light beams in a way reminiscent of electrons being deflected by the Lorentz force in a magnetic thin film. The direction of the stripes is that of the local in-plane magnetization vector. Thus the angle of deflecti... View full abstract»

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  • Characterization of magnetic bubble generators

    Publication Year: 1974, Page(s):23 - 27
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Two types of magnetic bubble generators suitable for a field-access bubble memory have been tested at 1.00 kHz bit rate at in-plane rotating fields above 15 Oe. The bias field margins of the generators at 30 Oe rotating field are equal to or greater than those of loop propagation. Both designs are based on the principle of stretching and cutting seed bubbles circulating around a Permalloy disk. Fu... View full abstract»

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  • Nonlinear domain-wall velocity and coercive force in permalloy films

    Publication Year: 1974, Page(s):27 - 31
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Domain wall velocities are measured for 2700 Å and 2200 Å thick Permalloy films of several coercive forces. The velocity-drive field curves are characterized by two mobilities, as often reported. It is found that these low- and high-field mobilities are strongly affected by coercive force of the films. The low-field mobility is nearly constant for low-coercive-force films, and decreases ... View full abstract»

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  • Influence of coercive force and easy-axis bias on domain wall motion in NiFeCo films excited by hard-axis pulses

    Publication Year: 1974, Page(s):31 - 36
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Domain wall motion in vacuum-deposited 1200 Å- 2000 Å-thick NiFe and NiFeCo films, excited by a 0.5 ns rise time/200 ns fall time hard-axis pulse field with an easy-axis dc field, is examined with regard to coercive force, easy-axis bias, and low-frequency creep results. Both NiFe and NiFeCo films have the same threshold field characteristics despite large differences in properties. The ... View full abstract»

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  • Movement of an individual Bloch wall in a single-crystal picture frame of silicon iron at very low velocities

    Publication Year: 1974, Page(s):36 - 38
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The movement of an individual Bloch wall in a single-crystal picture frame of silicon iron was studied. By using an electronic apparatus the wall velocity was held constant during the magnetization reversal. It was possible to control the wall velocity down to 10-2mm/s. Even at these low velocities the relationship between the wall velocity ... View full abstract»

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  • Statistical properties of magnetization discontinuities in technical steels

    Publication Year: 1974, Page(s):39 - 43
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The application of statistical methods to the study of technical steels is described and a statistical amplitude distribution function for the magnetization discontinuities is presented, making use of the correlation between the amplitudes observed and the structure of the material. It is shown by experimental measurements that the optically measured grain size distribution of fine-grain low-carbo... View full abstract»

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  • A new surface transducer for generating and detecting magnetic field transients in ferromagnetics

    Publication Year: 1974, Page(s):44 - 50
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    A new surface transducer is described for generating and detecting magnetic field transients or magnetization discontinuities in ferromagnetic materials [8]. The sensing is based on searching for transients of the magnetic potentials which would be likely to occur on the surface of the specimen. A coil core of high-frequency ferrite is used for this. The sensor theory presented shows the coaxial g... View full abstract»

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  • Variation with specimen size of some properties of Alcomax III at 50 Hz excitation

    Publication Year: 1974, Page(s):50 - 54
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    When subjected to dynamic excitation at 50 Hz with sinusoidal field intensity, the power loss per unit volume, coercive force and remanent flux density of square-section specimens of Alcomax III were found to be functions of specimen size. At fixed excitation the coercive force increased and the remanent flux density decreased both as linear functions of specimen section side dimension. Loss per u... View full abstract»

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  • Transient phenomena in magnetic circuits having components of solid ferromagnetic material

    Publication Year: 1974, Page(s):54 - 59
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    In solid ferromagnetic parts of magnetic circuits, eddy currents occur during changes of the magnetic flux. Magnetic circuits of real devices may often be decomposed into parts having approximately rectangular or circler cross sections. As the solutions for phenomena in infinite configurations of such cross sections are known, we can use these for solving phenomena in more complicated arrangements... View full abstract»

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  • Theory of magnetographic printing

    Publication Year: 1974, Page(s):60 - 69
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The magnetic force of attraction between a recording surface and magnetic particles (the "developer" or "toner") is analyzed. The recording medium is assumed to be magnetically hard, the toner particles to be magnetically soft. The distribution of recording magnetization is taken to be periodic in the interior of an image area and uniform in an image free area. The toner particles are assumed to b... View full abstract»

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  • Applications of Fourier transforms in digital magnetic recording theory

    Publication Year: 1974, Page(s):69 - 77
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    In this paper we present a unified treatment of many problems in digital pulse recording. The physics appropriate to each problem is characterized by a reciprocal-space transfer function, which may be abstracted from published studies of sine wave recording. Over twenty-five transfer functions are given in appendices. Given the transfer functions, an inverse Fourier transformation completes each p... View full abstract»

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  • Selected characteristics of plated wires from various sources

    Publication Year: 1974, Page(s):78 - 88
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Plated wires, 2.5 and 5.0 mils in diameter, have been obtained from various sources and compared to our own 2.5 mil diameter wire made on both copper-beryllium and tungsten substrates. The wires have been tested for their digit, word, and shmoo windows, pulse output and uniformity of output, skew and magnetostriction and their uniformity, the tension and torsion stress changes in the above charact... View full abstract»

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  • Analog memory devices based on NDRO toroidal cores

    Publication Year: 1974, Page(s):89 - 92
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Discussed are the main aspects of operation, physics, design, and application of toroidal cores as nondestructive read-out analog memory elements. The analog memory element and switch are the basic components of the analog memory device of the open-loop type (i.e., without negative feedback). The toroidal core has been shown, both theoretically and experimentally, to exhibit linear read-write char... View full abstract»

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  • A note on the magnetostrictive ringing in core memory systems

    Publication Year: 1974, Page(s):93 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The observed ringing voltages in core memory systems depend on the frequency and the width of the pulsed current inputs. The pulse-width dependence results in maxima and minima, and the frequency dependence also results in maxima and minima in the peak amplitude of the ringing voltages. These phenomena have been examined and analyzed by a superposition of waves excited by fields due to the rise ti... View full abstract»

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  • Poisson's and Laplace's equations in inhomogeneous magnetic media

    Publication Year: 1974, Page(s):94 - 96
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Poisson's equation in inhomogeneous static magnetic media is derived for the magnetic vector potential and for the magnetic scalar potential. A modified three-dimensional seven-point finite-difference operator to be used in numerical solutions is presented. The special case of discrete inhomogeneity as discussed. View full abstract»

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  • Method of forming ferrite impregnated resins for microwave measurements

    Publication Year: 1974, Page(s):96 - 97
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    An inexpensive, reproducible technique for forming films and slabs of ferrite and carbonyl iron loaded polyethylene has been devised. The advantages of this technique are 1) uniform distribution of the powdered material in the resin binder, 2)smooth and flexible specimens of predetermined thickness and dimensions, and 3) reproducible magnetic and dielectric data. View full abstract»

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  • [Back cover]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Axifield

    Publication Year: 1974, Page(s): 98
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    First Page of the Article
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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