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IEEE Transactions on Magnetics

Issue 2 • Date June 1974

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Displaying Results 1 - 25 of 54
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Introduction to the soft magnetic materials 1 conference

    Publication Year: 1974, Page(s): 103
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    Freely Available from IEEE
  • Recent developments of soft magnetic alloys in Japan

    Publication Year: 1974, Page(s):104 - 108
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Soft magnetic alloys that are now in practical use or under development in Japan are reviewed. In the field of Si-Fe alloys, the influence of various processing parameters, such as addition of elements, heat treatments, and alloy composition on the mechanical and the magnetic properties and recent developments in methods of measuring iron losses are described and discussed. As for Ni-Fe alloys, th... View full abstract»

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  • Magnetic transition and anomalous thermal expansion in R2Fe17compounds

    Publication Year: 1974, Page(s):109 - 113
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    In R-Fe compounds, the magnetic properties are mainly determined by the Fe-Fe interatomic distances and the number of Fe nearest neighbors. Below the ordering temperatures, the R2Fe17compounds are generally ferromagnetic or ferrimagnetic colinear. The compounds with rare earth ions of small atomic radii, Ce2Fe17, Tm2Fe17, and Lu... View full abstract»

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  • Losses in silicon-iron

    Publication Year: 1974, Page(s):113 - 115
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Measurements of total power loss and domain-wall spacing have been made on individual grains in polycrystalline specimens of commercial grain-oriented 3% silicon-iron material. The loss-per-cycle against frequency characteristic of a grain is found to consist of discrete linear portions, which correspond to different domain-wall spacings. These changes in domain pattern result in a lower value of ... View full abstract»

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  • The effect of surface on the power spectrum of the Barkhausen noise in ferromagnetic materials

    Publication Year: 1974, Page(s):115 - 117
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The Barkhausen noise power spectrum was investigated on laminated polycrystalline toroids of Fe and 4% SiFe as a function of sample thickness; that is, of surface-to-volume ratio. Upon decreasing the thickness strong variations of spectrum shape are observed-the cut-off frequency increases and the spectral density drops in the very-low-frequency range. On the other hand, only negligible variations... View full abstract»

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  • Barkhausen noise of 3% Si-Fe strips after plastic deformation

    Publication Year: 1974, Page(s):118 - 120
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Grain-oriented 3% Si-Fe strips were plastically strained up to \epsilon = 3 %. The frequency spectrum E(f) of the Barkhausen noise was measured. From E(O) a mean Barkhausen volume veffis calculated. The noise and veffare diminished after plastic deformation mai... View full abstract»

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  • The influence of the crystallite orientation distribution function (ODF) on the magnetocrystalline anisotropy of a rimmed steel thin sheet

    Publication Year: 1974, Page(s):120 - 122
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The aim of this study is to relate the magnetocrystalline anisotropy at saturation to the texture function for a low-carbon steel. The texture has been calculated by expanding the direct pole figures as a series of spherical harmonics. This quantitative determination of textures permits one to calculate a theoretical curve of the variations of the torque in the rolling plane. These calculations ar... View full abstract»

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  • High-field susceptibility of invar alloys

    Publication Year: 1974, Page(s):122 - 123
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    High-field susceptibility of iron-nickel alloys over the entire concentration range has been measured at 4.2 K. The temperature dependence of high-field susceptibility of alloys containing 29.1 and 32.7 at % Ni has been investigated in the temperature range from 4.2 to 150 K. Anomalous temperature dependence of the susceptibility of the alloys investigated can be explained by the existence of an a... View full abstract»

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  • New grain-oriented silicon steel with high permeability "ORIENTCORE HI-B"

    Publication Year: 1974, Page(s):123 - 127
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    A new grain-oriented silicon steel with a higher degree of grain orientation than usually obtainable by known conventional procedures was developed. The new material (HI-B) has made large improvements in core loss and magnetostriction characteristics by effects due to surface coating that are more remarkable with a higher degree of grain orientation. HI-B is 2-3 grade better than today's conventio... View full abstract»

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  • A review of the theory of magnetic anisotropy in Ni

    Publication Year: 1974, Page(s):132 - 136
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (426 KB)

    First Page of the Article
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  • Some special cases of the magnetization processes of ferromagnets

    Publication Year: 1974, Page(s):128 - 132
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    The subject of the reported work is the problems connected with the irreversible elementary magnetization processes, registered in the form of Barkhausen jumps, as well as the problems connected with the irreversible changes of the macroscopic magnetization of a ferromagnet in the process of the consecutive asymmetrical magnetization reversal and in the process of the periodic application of mecha... View full abstract»

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  • Influence of oxygen content on magnetic properties of Fe-Ni alloys

    Publication Year: 1974, Page(s):136 - 139
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    58-percent Ni-Fe alloys have been investigated. It was found that the magnetic properties of the alloys depend on the whole chemical composition: matrix + alloying + impurity. The amount of impurities may be influenced deliberately by a proper selection of the atmosphere, temperature and time of the heat treatment. The effect of magnetic annealing was also investigated. Approximately linear relati... View full abstract»

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  • The effect of manganese on the magnetic properties of mumetal alloy

    Publication Year: 1974, Page(s):139 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The effect of manganese content and the baking temperature on the magnetic properties of Mumetal (76% Ni, 2% Cr, 5% Cu, bal. Fe) especially on the initial permeability has been studied. The most suitable combination was found for a manganese content of 0.3 to 0.5% at the baking temperature of 500 to 550°C. View full abstract»

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  • The effect of temperatures on the coercive field of polycrystalline wires of 72% Fe-Ni

    Publication Year: 1974, Page(s):141 - 144
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The present paper investigates the mechanism governing the coercive field in polycrystalline wires of Fe-Ni with 72% Ni, plastically deformed. Experimental results on the temperature dependence of the coercive field are reported, both when an external stress equal to the flow-stress is applied to samples and, successively, when it is released. The experiments are compared to the theoretical models... View full abstract»

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  • Differential transformer cores for ground fault interrupting circuit breakers

    Publication Year: 1974, Page(s):144 - 148
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The magnetic requirements of differential transformers used in ground fault interrupters (GFI) for the sensing of 5 mA ground faults over the temperature range from -35°C to +66°C have been established. Ring laminations made of vacuum-melted permalloy and annealed so that the magnetocrystalline anisotropy K_{1} \sim 0 just above the maximum operatin... View full abstract»

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  • Problems in the design of power transformers

    Publication Year: 1974, Page(s):148 - 150
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The power loss of transformer cores can still be considerably reduced by improved joint design based on new knowledge of the localized flux distribution, both in the corners and in the limbs. Rotational flux has been measured in the T-joints of experimental cores, and it has been found to cause localized high loss regions dependent on the joint design. Circulating harmonic fluxes have been found i... View full abstract»

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  • Soft-magnetic materials in large turbo-alternators

    Publication Year: 1974, Page(s):151 - 154
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The economic design of large turbo-alternators is greatly affected by the properties of the soft magnetic materials available for building them. The saturation magnetization of the stator iron effectively determines the power output of a machine of given physical size. Losses in the iron waste power, and so must be minimized, while increasing the depth of a stator core, to reduce losses, leads to ... View full abstract»

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  • Measurement of magnetostriction and vibration with regard to transformer noise

    Publication Year: 1974, Page(s):154 - 156
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A simple technique of measuring the dynamic magnetostriction in silicon-iron using displacement transducers is discussed. The importance of stress and harmonics of magnetostriction is shown by considering the effects of improving the stress sensitivity of steel and reducing core vibration by a suitable bonding technique which can also reduce transformer noise. View full abstract»

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  • Single sheet tester for measuring core losses and permeabilities in a silicon steel sheet

    Publication Year: 1974, Page(s):157 - 159
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A new method which eliminates some disadvantages of the Epstein method has been developed for the rapid measurement of core losses and permeabilities at 50 or 60 Hz of single-sheet specimens. It is shown that the instrument has the following performance: 1) good correlation of the measured value with Epstein testing, 2) high stability, 3) simplicity of operation, and 4) use of a wide single-sheet ... View full abstract»

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  • Apparatus for the measurement of the magnetization of steel

    Publication Year: 1974, Page(s):159 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    An improved method has been developed for measuring the magnetization of steel with great accuracy up to saturation. With toroidal samples it is not possible to reach the necessary field strength. Ellipsoidal samples are used, for which the magnetizing factor can be calculated exactly. The specimens are 200 mm long, have a maximum diameter of 10 mm, and are shaped accurately to within 0.01 mm. Wit... View full abstract»

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  • Rotational hysteresis loss in silicon-iron single cyrstal with

    Publication Year: 1974, Page(s):165 - 167
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (402 KB)

    Rotational hysteresis loss has been measured on small discs of approximately 4% silicon-iron single crystal with View full abstract»

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  • Iron-cobalt-vanadium alloys: A critical study of the phase diagrams in relation to magnetic properties

    Publication Year: 1974, Page(s):161 - 165
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A tentative explanation of some physical, magnetic, and mechanical properties in magnetically soft or semihard Fe-Co-V alloys is proposed in the light of present knowledge of their structural features. On account of important discrepancies, it is felt that metastable equilibrium diagrams, which are of greater significance for practical purposes, should be confirmed, and it would be of interest to ... View full abstract»

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  • Domain configuration under rotational flux and applied stress conditions in silicon-iron

    Publication Year: 1974, Page(s):168 - 169
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Measurements of power loss have been made on individual grains in polycrystalline specimens of commercial 3% grain-oriented silicon-iron under longitudinal and transverse ac magnetization and rotational flux conditions. The domain configurations have also been observed using a stroboscopic Kerr magnetic-optic apparatus. The effect of longitudinal stress and dc bias fields on the domain patterns an... View full abstract»

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  • Magnetic properties of Goss-textured Si-Fe sheets with the addition of Al

    Publication Year: 1974, Page(s):170 - 172
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Small additions of Si, Al, Ge... improve the magnetic properties of silicon-iron alloys. Goss-textured silicon iron with aluminum addition up to 2 wt% was produced by vapor deposition and subsequent diffusional annealing. After suitable treatment the total losses were reduced by about 12%. 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