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IEEE Transactions on Magnetics

Issue 4 • Date December 1970

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • A model of magnetostriction interaction in thin double-layer magnetic films of Ni-Fe alloy

    Publication Year: 1970, Page(s):766 - 768
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Under the assumption that in a double-layer film both layers are equally deformed, the following formula for the magnetostriction energy E = K_{c} \sin^{2} \alpha has been derived where K_{c} = (9/40)(2U'U is the coupling constant and α is the angle between the magnetization vectors. This formula i... View full abstract»

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  • Electron microscopy on high-coercive-force Co-Cr composite films

    Publication Year: 1970, Page(s):768 - 773
    Cited by:  Papers (96)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    Electron microscopy was used to analyze the crystallographic and magnetic structures of high-coercive-force Co-Cr composite films. The chromium sublayer appears to give high coercive forces by causing the growth of cobalt in the hexagonal phase with a relatively narrow distribution of grain sizes. Magnetization reversal was examined by Lorentz microscopy of films with coercive fields up to View full abstract»

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  • 0.25 × 106bit/in2NDRO coupled film memory elements

    Publication Year: 1970, Page(s):774 - 778
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The fabrication and operation of high-density (0.25 × 106bit/in2) nondestructive readout (NDRO) memory elements are described. The high density is made possible by coupled films and Permalloy keeper. The NDRO is made possible by multiple-pulse WRITE or hard-direction bias field. Typical performance parameters are ... View full abstract»

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  • Signal sensing and magnetic film memory array design

    Publication Year: 1970, Page(s):778 - 784
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    A signal-to-noise analysis is presented to show its influence on the design of magnetic film memory arrays. The device geometry and array dimensions are varied independently to find the design limits within which reliable signal detection can be performed, that is, the range within which adequate signal-to-noise ratio is obtained at the sense amplifier. The result is a plot of the required number ... View full abstract»

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  • Stress relief mechanism of aging in plated-wire memories

    Publication Year: 1970, Page(s):785 - 789
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Results are presented which identify a dominant aging mechanism of plated-wire memory elements in the absence of magnetic fields. This mechanism, i.e., stress relief in the Permalloy film, can occur even in elements stabilized against field-induced aging. The evidence for stress relief consists of aging and strain sensitivity measurements on samples of different Permalloy composition. In aging exp... View full abstract»

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  • Magnetoelastic effect in thin magnetic films at parametric excitation

    Publication Year: 1970, Page(s):789 - 791
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The bending oscillations of the film-substrate system, explained by magnetostriction interaction, were observed at parametric excitation of thin magnetic films at the frequency 11 MHz. The frequency of the bending oscillations changed from 104to 105Hz. The dependences of the elastic modes on dc and HF magnetic fields affecting the film have been investigated. Some advice for ... View full abstract»

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  • Core memories: The perennial leader

    Publication Year: 1970, Page(s):791 - 795
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    An historical survey of the memory industry is given, and the progress of the ferrite core memory since it was first introduced is examined. It is shown that the computer industry could not have developed without a reliable and relatively cheap storage element capable of being produced in great quantity. The core memory satisfied this requirement but appeared to be vulnerable to competition by tec... View full abstract»

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  • Formation and magnetic properties of ultrafine spinel ferrites

    Publication Year: 1970, Page(s):795 - 799
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Investigations of the formation and magnetic properties of MnδCo1-δFe2O4formed in alkaline aqueous solution by the coprecipitation method are covered. The lattice constant of these ferrites apparently reduced with decreasing average particle size below about 500 Å. The coercive force ratio of MnFe2O4and Co-Fe... View full abstract»

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  • Statistical characterization of polycrystalline ferrite media

    Publication Year: 1970, Page(s):800 - 803
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The classical field theory superposition principle, the central limit theorem, and the gyromagnetic equations of motion are invoked as a basis to formulate a quasi-static statistical model for polycrystalline ferrite media with Gaussian statistics. The use of this model to analyze small signal reversible rotational phenomena is illustrated. It is also demonstrated that this model and a previous mi... View full abstract»

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  • Effect of interaction on magnetic properties of a particulate medium

    Publication Year: 1970, Page(s):804 - 808
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Samples of magnetic particles were prepared in dry powder form, as well as in a plastic binder system. Magnetic measurements were made on the samples as function of the volumetric packing factor. Coercive force Hc, squareness, and anhysteretic magnetization measurements are correlated with the uniformity of particle dispersion. It was found that the behavior of Hc, squareness... View full abstract»

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  • Accidental printing effect of magnetic recording tapes using ultrafine particles of acicular γ-Fe2O3

    Publication Year: 1970, Page(s):808 - 811
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Five kinds of acicular γ-Fe2O3powder of which axial length varies from 0.17 to 0.80 μm with almost the same axial ratio are manufactured. The variance of coercive force and printing effect as the average axial length of the particles varies is shown. Coercive force of which particle axial length is about 0.35 μm shows maximum value. The printing effect increase... View full abstract»

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  • Characteristics of the readback signal in digital magnetic recording

    Publication Year: 1970, Page(s):811 - 817
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    A theoretical treatment for the readback process in digital magnetic recording is presented. Three major factors, namely, the medium constant s which defines the extent of the surface charge density, the head-to-medium spacing d , and the read head gap 2 g, are taken into consideration... View full abstract»

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  • Offset and noise in fluxgate magnetometers

    Publication Year: 1970, Page(s): 818
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    First Page of the Article
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  • Temperature compensation of fluxgate magnetometers

    Publication Year: 1970, Page(s):819 - 822
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Based on the finding that the temperature dependence of fluxgate sensors is proportional to the measured field, a temperature compensation circuit is described using the copper resistance of the fluxgate secondary winding as the thermosensitive part of a bridge. The bridge voltage is derived from the magnetometer output so the compensation is only active in high fields. View full abstract»

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  • Pressures on cylindrical magnetic domain walls

    Publication Year: 1970, Page(s):822 - 827
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The pressures on cylindrical magnetic domain walls are discussed with particular emphasis on bubbles, that is, near-circular domains. In the case of anisotropic wall energy, bubbles will be slightly elliptical, and a formula is derived relating the ellipticity to the anisotropic wall energy. Various formulations for the average magnetic field at a domain wall are presented. The problem of cutting ... View full abstract»

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  • Three-dimensional nonlinear magnetic field boundary value problem and its numerical solution

    Publication Year: 1970, Page(s):828 - 833
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    An accurate solution to the nonlinear magnetic field boundary value problem which results when ferromagnetic materials are present is generally very difficult to obtain. Several computer codes based on a magnetic vector potential have been published in the literature. While those codes can be used to solve 2-dimensional problems, difficulties arise in their application to 3-dimensional problems. O... View full abstract»

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  • AC losses of high-field superconductors

    Publication Year: 1970, Page(s):833 - 839
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The Riemersma critical state model is applied to a long irreversible type-II superconductor carrying ac. Voltage waveforms, energy loss per cycle, and limiting values of effective resistivity are derived. For sinusoidal current of frequency f in 10-mil wire the critical current limit of resistivity is 4.06 × 10-14f (ω.m). An equivalent circuit consisting of a variable inductan... View full abstract»

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  • Effect of leakage and source inductances on the switching pattern of a magnetically coupled tunnel diode oscillator

    Publication Year: 1970, Page(s):840 - 844
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A magnetically coupled tunnel diode oscillator employing a square-loop core is analyzed. Particular emphasis is given to understanding the effects of small, yet inevitable, leakage inductances and the inductance of the dc source on the switching pattern of the tunnel diodes. The combined size of these inductances is found to be the determining factor that leads to many unusual switching phenomena ... View full abstract»

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  • Functional stability conditions for logic devices of K- valued logic

    Publication Year: 1970, Page(s):844 - 846
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    For any input signal of logic elements (LE) which realize logical functions of K -valued logic to be converted into any output signal, it has been shown to be sufficient that the LE have 2(K- 1) different input-output characteristics without equal values of the output signal at neighboring discrete values of input signals... View full abstract»

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  • A statistical model of core noise in half-wave push-pull magnetic amplifiers

    Publication Year: 1970, Page(s):847 - 849
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The core noise was measured for the half-wave push-pull magnetic amplifiers using various ferromagnetic materials as functions of the number of laminations of a stacked ring core and ac supply frequency. A statistical model of the core noise is proposed. It was deduced that the mean number of magnetic elementary regions associated with the core noise is proportional to values ranging from View full abstract»

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  • On the nature of mirror substrates

    Publication Year: 1970, Page(s):849 - 850
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The use of reflecting substrates to enhance the Kerr magnetooptic effect has frequently been discussed. The nature of such a realizable high reflectivity mirror is described in a simple way. View full abstract»

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  • Influence of cobalt on annealing of zero magnetostrictive Ni-Fe-Co films

    Publication Year: 1970, Page(s):851 - 853
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Zero magnetostrictive films about 1000 Å thick with cobalt contents from 0 to approximately 50 percent have been subjected to easy- and hard-axis saturating fields. The changes in characteristics were examined on aging for four hours in 30°C steps up to 240°C. Anisotropy field, dispersion, and coercive force were examined. The anisotropy and dispersion changes on aging indicated som... View full abstract»

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  • Light modified switching properties of garnets and ferrites

    Publication Year: 1970, Page(s):853 - 857
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The influence of light on the switching behavior of Si-doped Y3Fe5O12and Co-substituted Ni-Zn ferrites is investigated. After irradiation with light, YIG (Si) has an extremely square hysteresis loop, and the switching transients display anomalous behavior. When a step field is applied, there is a certain period of time during which no flux is switched irreversibly.... View full abstract»

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  • Surface spin pinnning model for magnetic properties of oxidized thin films on substrates

    Publication Year: 1970, Page(s):857 - 862
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A simple model for oxidized thin ferromagnetic film deposited on a substrate based on the concept of surface spin pinning is proposed. A spin wave analysis of the spatial distribution of the magnetization through the film thickness, as well as of the total relative magnetization, is performed. Qualitative results are reported for three different cases: complete pinning of spins on both surfaces, o... 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