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IEEE Transactions on Magnetics

Issue 4 • Date December 1973

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Displaying Results 1 - 25 of 29
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Magnetic domain wall dislocation analogy and intrinsic coercivity

    Publication Year: 1973, Page(s):602 - 606
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A close analogy is shown to exist between a discrete crystal model of a magnetic domain wall and the Frenkel-Kontorowa model for crystal dislocations. It is used here for a simple calculation of the intrinsic coercivity (that due solely to the discrete character of the crystal lattice) of a 180° wall in an otherwise perfect crystal. On a purely continuum level, the analogy between dislocation... View full abstract»

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  • The magnetostriction of rare-earth garnets containing gallium and europium: Old theory for new problems

    Publication Year: 1973, Page(s):606 - 609
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A calculation is made of the effect of gallium substitution upon the magnetostriction of rare-earth garnets, a problem of some interest because of the use of gallium substituted garnets as bubble-domain materials. The gallium alters the contribution to magnetostriction of the iron lattices by simple dilution and of the rare-earth lattice by reducing the exchange field acting upon the rare-earth io... View full abstract»

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  • Domain wall velocity and interrupted pulse experiments

    Publication Year: 1973, Page(s):609 - 613
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The velocity of magnetic domain walls in Bloch wall Permalloy thin films excited by interrupted easy axis drive fields is investigated and correlated with the available theory of transient wall contraction. The experimental technique is useful in determining the average wall velocity, and by comparing the velocity-field curves with field duration as a parameter it is possible to infer several feat... View full abstract»

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  • Influence of an in-plane magnetic field on the domain-wall velocity in Ga: YIG films

    Publication Year: 1973, Page(s):614 - 616
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Results are reported of an investigation on the velocity of a single straight magnetic domain wall in a Ga:YIG film as a function of the drive field and of a static magnetic field applied perpendicular to the wall in the plane of the film. At all drive fields a substantial increase of the wall velocity was observed when the in-plane field was applied. At an in-plane field of about 400 Oe and at a ... View full abstract»

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  • Domain formation and associated wall states

    Publication Year: 1973, Page(s):617 - 621
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Generation of Bloch lines in closed domains is examined on the premise that the magnetization remains continuous at all times. The model predicts the creation of two nonunwinding lines during the formation of each domain. Precession of the wall magnetization generates trains of unwinding lines. If such a domain is split while in a comb-like configuration, the resulting walls may contain large numb... View full abstract»

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  • On the radial mode in bubble lattices

    Publication Year: 1973, Page(s):621 - 624
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The radial mode resonance frequency and quality factor behavior in general bubble lattices is studied. Results of direct calculations for the triangular lattice with l/z = 0.25 are given and discussed in connection with the findings of Kaczér and Tomás. An alternative scheme allowing a calculation of the reduced frequency and quality factor on the b... View full abstract»

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  • Effects of heat treatment on the magnetic properties of an epitaxial Ga: YIG film

    Publication Year: 1973, Page(s):624 - 626
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    An epitaxial film of Ga:YIG, deposited on a Dy: GGG View full abstract»

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  • Magnetic properties of cobalt rare-earth thin films

    Publication Year: 1973, Page(s):627 - 631
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    This paper describes the magnetic properties of dc sputtered thin films of Co-Gd and Co-Sm in various compositions. Magnetic moment density, hysteresis loop coercivity and squareness, and rotational hysteresis loss measurements are reported. Crystallite and domain sizes were observed with an electron microscope for a few compositions. A tentative model of magnetization reversal is proposed for som... View full abstract»

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  • Hysteresis properties of sintered Sm Co5permanent magnets

    Publication Year: 1973, Page(s):631 - 635
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The magnetic properties of individual SmCo5particles have been extensively studied in the literature. In the present work, initial magnetization curves and hysteresis loops of sintered SmCo5magnets have been drawn with a hysteresigraph. The observed properties depend on the previous magnetic treatment of the sample. After thermal demagnetization, the initial susceptibility is... View full abstract»

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  • Magnetic and magnetostrictive properties of cube textured nickel for magnetostrictive transducer applications

    Publication Year: 1973, Page(s):636 - 640
    Cited by:  Patents (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Magnetic and magnetostrictive properties of {100} <100> textured, polycrystalline nickel sheet have been measured in the <100> direction and compared with a randomly oriented nickel sheet. The {100} <100> textured nickel produced a 51 percent increase in the available magnetostrictive strain energy along with a 21 percent decrease in sound velocity. These improved characteristics... View full abstract»

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  • Influence of dislocation on magnetic domains in plastically deformed 3% Si-Fe

    Publication Year: 1973, Page(s):647 - 650
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (941 KB)

    Characteristic layer-like magnetic domains are observed on many large crystals of a polycrystalline bioriented type View full abstract»

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  • Measurements of spectra of clustered Barkhausen transitions in technical steel

    Publication Year: 1973, Page(s):641 - 646
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    Various measurements are performed to investigate the spectra of clustered Barkhausen transitions in technical steel. These spectra are formed by the discontinuous jumps of magnetization in the material, when the external magnetic field is changed with relatively high speed. The methods used include power, amplitude and autocorrelation spectra and their magnetization and temperature dependences. A... View full abstract»

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  • Measurement of rotating flux in silicon iron laminations

    Publication Year: 1973, Page(s):651 - 654
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A method of calculating the magnitude and direction of the instantaneous flux density in a thin lamination of magnetic material is described. The technique was demonstrated by measuring the rotating flux in samples of mild steel, grain-oriented silicon iron, and at a point in the T-joint of a three-phase, three-limbed transformer core. The flux in the mild steel sample was found to rotate at a con... View full abstract»

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  • The spatial variation of localized power loss in two practical transformer T-joints

    Publication Year: 1973, Page(s):655 - 659
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The power loss and flux distribution in two commercial T-joints have been compared. The simple 45°-90° T-joint and the slightly more complex 45° offset T-joint were chosen for the investigation, as they are the most common joints currently used in power transformers. The localized and overall power loss of each joint was measured using now-established techniques. Each joint was buil... View full abstract»

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  • Stripe-domain dynamics in bubble-domain circuits

    Publication Year: 1973, Page(s):660 - 663
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    It is widely known that bubble domains can exist when the bias field is between the elliptic instability (runout) field Heand the bubble collapse field Hbc. Values for Heand Hbcwere calculated by Thiele. It is not widely recognized that long stripe domains can also exist in the bottom 20% of this range. Stripes are stable up to the "stripe contraction" f... View full abstract»

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  • Magnetic bubble-domain detection: Review and outlook

    Publication Year: 1973, Page(s):663 - 669
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    This paper reviews the early work on the detection of magnetic bubble domains, as well as summarizing and comparing the most recent results. Topics include InSb sensors, Permalloy sensors (thick-film as well as thin-film), and bubble stretching techniques. The limitations on sensor input power imposed by heat dissipation and other factors are discussed. The relationship between bubble size and sen... View full abstract»

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  • The propagation of magnetic bubbles on permalloy disks

    Publication Year: 1973, Page(s):670 - 673
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A magnetic bubble generator consisting of a Permalloy disk and a current conductor loop has been used recently in a mass memory design utilizing magnetic bubble technology. The bias field range in which the disk can hold the seed bubble is measured in this report as a function of of the rotating field frequency. Above a critical frequency fc, the bias field margins begin to decrease. Th... View full abstract»

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  • Techniques for the measurement of air-bearing separation -- A review

    Publication Year: 1973, Page(s):673 - 677
    Cited by:  Papers (10)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Various techniques for the measurement of air-bearing separation are described. Examples are given in the specific area of self-acting air-bearing sliders on rotating disks. The techniques can be categorized as capacitive, inductive and optical. The optical technique lacks frequency response but can provide an accurate and convenient way of calibration for the typically nonlinear but versatile cap... View full abstract»

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  • One-sided fluxes -- A magnetic curiosity?

    Publication Year: 1973, Page(s):678 - 682
    Cited by:  Papers (105)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    It is shown that a previously unknown class of magnetization patterns exists in planar structures which have the unique property that all the flux escapes from one surface with none leaving the other side. A simple case is a constant amplitude rotating vector magnetization where the sense of rotation dictates which surface has no flux. More complicated magnetization patterns are elucidated. The li... View full abstract»

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  • Experimental and theoretical investigation of head to tape separation in magnetic recordings

    Publication Year: 1973, Page(s):683 - 688
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Although the mathematical model of a tape traveling over a cylinder (foil bearing) has been shown experimentally to be valid for a closely similar physical model, its application to predict separation between a tape and a magnetic head has shown large discrepancies. In this work, a modified model of a foil bearing, taking into account some details of the particular geometry of magnetic heads, is u... View full abstract»

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  • Fourier synthesis of digital recording waveforms

    Publication Year: 1973, Page(s):689 - 697
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    A digital recording system is modeled by means of a complex Fourier series representation employing transforms of arctangent functions to describe the effects of write field gradient demagnetization and self-demagnetization. Pulse asymmetry and rise time effects are incorporated by means of phase shifts from complex transfer functions used in describing the dependence of head properties on a compl... View full abstract»

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  • The reading characteristics of a finite length pole piece recording head

    Publication Year: 1973, Page(s):698 - 699
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The frequency response of a finite-length pole piece recording head is calculated numerically for various gap-to-pole-length ratios as well as for differing head-to-medium separations for an idealized sinusoidal magnetization distribution by application of the Cooley-Tukey fast Fourier transform. View full abstract»

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  • Laser recording on MnBi films

    Publication Year: 1973, Page(s):700 - 704
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The results of laser recording experiments in which a magnetic field controls the magnetization distribution along Curie-point switched micron-wide tracks are described. These experiments showed that analog as well as digital information may be recorded in this manner. View full abstract»

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  • Comments on "The theoretical output of a ring core flux-gate sensor"

    Publication Year: 1973, Page(s): 708
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (105 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