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IEEE Transactions on Magnetics

Issue 5 • September 1979

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Displaying Results 1 - 25 of 38
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Foreword

    Publication Year: 1979, Page(s): 1191
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    Freely Available from IEEE
  • Bibliography of William Fuller Brown, Jr.

    Publication Year: 1979, Page(s):1194 - 1195
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Covers books and contributionst o books, articles, abstractas nd summaries, and book reviews and other short items. View full abstract»

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  • William Fuller Brown, Jr.

    Publication Year: 1979, Page(s):1192 - 1193
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    First Page of the Article
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  • Thermal fluctuation of fine ferromagnetic particles

    Publication Year: 1979, Page(s):1196 - 1208
    Cited by:  Papers (200)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1496 KB)

    Fine ferromagnetic particles jump spontaneously from one locally stable state to another; they surmount intervening energy bartiers with the aid of thermal agitation. A theory of this phenomenon has as its primary goal the calculation of time constants. The elements of such a theory are presented. The emphasis is on calculations that require only elementary methods and on results that are simple e... View full abstract»

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  • On the stability of certain magnetic modes in fine ferromagnetic particles

    Publication Year: 1979, Page(s):1209 - 1214
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Conditions of stability of the magnetization curling mode in fine spherical and cylindrical particles and of the magnetization helicoid structure in fine cylindrical particles are derived, and magnetization reversal processes in such particles are considered. The application of Ritz's method for solving the variational problem of finding the local magnetization vectors in the volume of a particle ... View full abstract»

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  • Micromagnetism in two dimensions

    Publication Year: 1979, Page(s):1215 - 1218
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The two-dimensional approximation to the magnetostatic problem in solving the equilibrium equations of micromagnetism is reviewed. The ripple equation leads to the effective demagnetizing field, which can be determined by means of high sensitive susceptibility measurements. A method for characterizing the quality of ferromagnetic thin film samples by conventional susceptibility measurement is desc... View full abstract»

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  • Micromagnetism in Amorphous Alloys

    Publication Year: 1979, Page(s):1218 - 1225
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Brown's micromagnetic equations are derived for the case of dipolar and "magnetocrystalline" fluctuations in amorphous ferromagnetic alloys. The influence of these fluctuations and the effects of internal stresses of so-called quasi-dislocation dipoles on the law of approach to ferromagnetic saturation is discussed in detail. It is shown that intrinsic fluctuations of magnetic properties lead to a... View full abstract»

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  • Numerical micromagnetic calculations

    Publication Year: 1979, Page(s):1225 - 1228
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Solutions of certain micromagnetic problems using digital computers have been attempted in the past decades. These problems are becoming increasingly important as magnetic devices, such as magnetic bubbles, are built which require high resolution. Some problems encountered in these types of calculations are discussed. View full abstract»

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  • Point singularities and magnetization reversal in ideally soft ferromagnetic cylinders

    Publication Year: 1979, Page(s):1228 - 1235
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    The principles of micromagnetics are used to describe the magnetization processes and magnetic configurations in a cylinder of finite length. The cylinder is of radius large compared to the exchange radius. Magnetostatic terms dominate in the limit that crystalline anisotropy is negligible. The exchange energy is minimized for boundary conditions primarily determined by magnetostatics. The point s... View full abstract»

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  • Magnetization of a two-component Stoner-Wohlfarth particle

    Publication Year: 1979, Page(s):1235 - 1240
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The free energy of an arbitrary two-component Stoner-Wohlfarth particle is derived and general criteria for stable states of magnetization are established. Hysteretic properties of coaxial prolate spheroids composed of γ-Fe2O3coated iron particles are calculated numerically and the specific extension to epitaxial cobalt ferrite γ-Fe2O3particles... View full abstract»

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  • Grain size limits for pseudosingle domain behavior in magnetite: Implications for paleomagnetism

    Publication Year: 1979, Page(s):1241 - 1246
    Cited by:  Papers (70)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (630 KB)

    A theoretical model of grain size dependence of domain transitions in magnetite is presented. This domain model is used to predict the grain size range for pseudosingle domain (PSD) behavior in magnetite. For cubic magnetite particles, the single domain (SD) to two-domain (TD) transition occurs at ∼800 ± 200 Å, the TD-three-domain transition occurs at ∼ 1500 Å, and the P... View full abstract»

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  • Coping with Brown's paradox: The pinning and nucleation of magnetic domain walls at antiphase boundaries

    Publication Year: 1979, Page(s):1246 - 1250
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The critical field for unpinning or nucleation of a domain wall in a ferromagnetic crystal at an antiphase boundary (APB) is calculated as a function of the magnetic coupling constant η across the APB. It turns out that for positive values of η pinning occurs and that for negative values there is very strong pinning and also nucleation. View full abstract»

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  • Charged walls in thin magnetic films

    Publication Year: 1979, Page(s):1251 - 1260
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Charged walls are domain walls which carry a net "magnetic charge" (div M) due to their orientation relative to the domain magnetizations. They differ from ordinary Bloch and Néel walls (which are uncharged) primarily in their much wider profile. In order to calculate such walls, a variational method was developed. It is based on the separation of that part of stray field energy which would b... View full abstract»

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  • Hard magnetic bubbles

    Publication Year: 1979, Page(s):1261 - 1271
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1368 KB)

    After a brief review of normal bubble domain magnetostatics, the static properties of hard magnetic bubbles are introduced by means of some experimental data and the hypothetical micromagnetic structure of the hard bubble wall is described. This structure may be represented by means of a fairly simple analytic function and leads to a good explanation of the static properties of hard magnetic bubbl... View full abstract»

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  • Horizontal Bloch line motion in magnetic bubble materials

    Publication Year: 1979, Page(s):1272 - 1284
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1512 KB)

    Horizontal Bloch line (HBL) motion in magnetic bubble materials is studied by comparing experimental results with a numerical simulation of domain wall motion. The present theory of HBL motion is reviewed and then extended by allowing both the wall position q and azimuthal angle φ to vary with position through the film thickness z. The resulting equations of motion are solved numerically for ... View full abstract»

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  • A contribution to the theory of domain wall mass at high velocities

    Publication Year: 1979, Page(s):1285 - 1290
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Two first integrals are given for the differential equations determining homogeneous motion of one-dimensional walls. These lead to a proof that such walls do not exist above the same critical velocity at which the Schlömann particular solution breaks down. It is speculated that this implies a high-mass solution even in one dimension, which would make the critical velocity an upper bound to a... View full abstract»

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  • On maze domains in silicon iron crystal

    Publication Year: 1979, Page(s):1291 - 1295
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    Changes of the maze domain upon application of a horizontal field and a mechanical tension were observed for 4-percent Si-Fe crystal. It was found that the value of the local internal stress obtained in a previous paper should be reduced by a factor of 0.22 by taking into account the μ* correction. The corrected value agrees with the present experiment. The maze domains induced beneath an ind... View full abstract»

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  • Magnetostatic interactions in a duplex ferromagnetic alloy

    Publication Year: 1979, Page(s):1295 - 1299
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    The chill-cast alloy, Fe75Si15B10, consists of submicron rods of Fe2B, a magnetically "hard' phase with high Tc, in a matrix of Fe3Si, a "soft" phase with low Tc. Magnetic properties change markedly on cooling through 590°C, the Tcof Fe3Si, and 245°C, where the magnetocrystalline anisotropy... View full abstract»

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  • Operational tests for homogeneous magnetic ordering and the nature of the spin-glass phase in Cr-Fe alloys

    Publication Year: 1979, Page(s):1299 - 1302
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (382 KB)

    We examine the information yielded by plotting magnetization curves in the formM^{2}.H/M(Arrott plots) by reference to some exactly soluble models. It is concluded that the spin-glass alloys, 7- 16 percent Fe in Cr, are homogeneously magnetically ordered. View full abstract»

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  • Influence of magnetocrystalline anisotropy effects on the magnetic isotherms of hexagonal Laves phase materials in the system Zr(Fe, Al)2

    Publication Year: 1979, Page(s):1302 - 1304
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB)

    TheM(H,T)isotherms of the hexagonal Laves phase materials Zr(FexAl1-x)2(0.56 leq x leq 0.74) were obtained experimentally in fields up to 72 kG and at a temperature 4.2 K. The resulting Arrott plots (M2versus H/M) show downturns from the linear behavior characteristic of weak itinerant ferromagnets in fields in the range H/M about 0... View full abstract»

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  • Modeling of fields in magnetic drum separators

    Publication Year: 1979, Page(s):1305 - 1309
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Little analytical work has been done in evaluating the periodic magnetic fields and associated field gradients which determine small particle behavior in drum separator systems. One of the few investigations of recent times is that of W. F. Brown, Jr. [1] in which experimental data on field values are fitted to a Fourier series expressed in terms of the azimuthal angle about the drum axis. Here, a... View full abstract»

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  • An application of the Brown-Morrish theorem to force transmitting devices

    Publication Year: 1979, Page(s):1309 - 1312
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A simple model is used to optimize the design of permanent magnet, coaxial, force couplers. Two configurations (with and without flux-closure yokes) are analyzed and design parameters are given for maximizing either coupling force or stiffness per unit volume of magnetic material. The model is also modified to the case of magnetic bearings. By means of the theorem of Brown and Morrish, it is shown... View full abstract»

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  • A study of particle arrangement in magnetic tapes

    Publication Year: 1979, Page(s):1312 - 1314
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Particle dispersion and particle orientation in magnetic tapes are experimentally interpreted by using a large-scale model which consists of commercial carbon steel wires and a vinyl chloride binder. Results suggest that the particle orientation in the plane through the thickness of the coating was broader than that in the plane of coating. Even though the micromagnetic equations are not properly ... View full abstract»

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  • Thermodynamics of post-erasure signal effect in γ-Fe2O3magnetic recording tapes

    Publication Year: 1979, Page(s):1315 - 1318
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Some γFe2O3-based magnetic recording tapes, particularly those using larger particle size γFe2O3, tend to retain a low-level or latent residual recorded signal after erasure with a large alternating magnetic field. The residual signal effect increases with time and temperature of storage after recording. The effect varies with the FeO content 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