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IEEE Transactions on Magnetics

Issue 4 • Date December 1974

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Displaying Results 1 - 25 of 32
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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  • The 6th International Colloquium on Magnetic thin films--Minsk, USSR, August 29-31, 1973

    Publication Year: 1974, Page(s):1022 - 1023
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

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  • Pulse switching in thin magnetic films

    Publication Year: 1974, Page(s):1023 - 1027
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    The main results of the investigations of pulse switching in thin magnetic films with uniaxial anisotropy which have been obtained in Moscow State University are reviewed. Simultaneous investigation of integral switching properties, inner effective field, and dynamic domains produced during pulse switching has increased our understanding of bi-directional incoherent rotation mechanism and found ne... View full abstract»

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  • Band model approach for the magnetic stiffness within ferromagnetic thin films

    Publication Year: 1974, Page(s):1028 - 1032
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    The magnetic stiffness within ferromagnetic thin films, considered as a tendency of the film to be homogeneous with respect to the distribution of magnetization directions, is defined on the basis of the domain structure as well as of the spin wave theory. The transversal stiffness parameter in thin films is calculated by means of the band model approach within a Hartree-Fock type of approximation... View full abstract»

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  • Some magnetooptical and HF properties of magnetic films

    Publication Year: 1974, Page(s):1033 - 1038
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    Several effects accompanying the propagation of electromagnetic waves through magneto-ordered media are discussed. First the information writing obtained by cooling through the Néel point of the antiferromagnetic substrate coupled by exchange interaction with the magnetic film is considered. By changing the exchange coupling it is possible to write and steadily retain arbitrary microdomain co... View full abstract»

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  • Long wavelength AC bias recording theory

    Publication Year: 1974, Page(s):1039 - 1048
    Cited by:  Papers (24)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    Long wavelength ac bias record sensitivity is computed utilizing a model in which both longitudinal and vertical record fields are considered. It is assumed that the recorded magnetization is related by an anhysteretic susceptibility tensor to the signal field. At each depth in the tape the signal field is evaluated where the bias field amplitude is equal to the tape coercivity. Neither the effect... View full abstract»

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  • Motion reversal invariance in tape recorders

    Publication Year: 1974, Page(s):1048 - 1049
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    Under certain circumstances, when replaying prerecorded tapes, a reversal of head-tape motion causes a simple time reversal of the output. The occurrence of this phenomenon depends entirely upon the characteristics of the reproduce channel. Motion reversal invariance occurs when the time dependent part of the reproduce channel impulse response displays either of two types of symmetry;in the freque... View full abstract»

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  • Magnetic torque properties of imperfectly textured polycrystalline 3 percent Si-Fe with varying amounts of

    Publication Year: 1974, Page(s):1052 - 1055
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    An equation is presented for the variation of magnetic torque with deviations from ideal View full abstract»

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  • Magnetostriction in some magnetic oxide compacted powders

    Publication Year: 1974, Page(s):1050 - 1052
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Magnetostriction measurements have been made on a series of compacted powder samples of oxide pigments used in magnetic recording, to provide information for the evaluation of the role of magnetostriction in the recording process. Two composition series were measured at 294 K: one from γFe2O3through a range of partial reductions to Fe3O4, and anothe... View full abstract»

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  • Simple real-time Fourier analyzer and its application to analysis of magnetic torque curves

    Publication Year: 1974, Page(s):1056 - 1059
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A method for the simple construction of the discrete Fourier analyzer operating in real time is described. The simplicity is realized by using two basic analog elements, i.e., magnetic analog memory elements and Fourier coefficient calculators using operational amplifiers. Practically, the real-time Fourier analyzer for the calculation of the Fourier coefficients with a scheme of 12 ordinates is c... View full abstract»

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  • Magnetic bubble logic

    Publication Year: 1974, Page(s):1059 - 1066
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Although the literature on the bubble logic devices is limited, the concepts and device configurations are diverse. In conductor-access devices, logic can be performed by bubble transfer operations. In field-access devices, logic can be performed by providing alternative paths which are selected by interaction between bubbles. Examples include the conjugate logic gates, the resident-bubble cellula... View full abstract»

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  • Fabrication of bubble memory chips

    Publication Year: 1974, Page(s):1067 - 1071
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1480 KB)

    Investigations have been made on the fabrication of accurate and uniform T-bar circuits. Chrome masks are preferable to emulsion masks, and furthermore, a minimum exposure and intimate contact have been demonstrated to be necessary for accurate and uniform pattern imaging on the AZ1350 resist. A newly developed chemical etchant, a nitric acid-base solution without ferric chloride, can almost elimi... View full abstract»

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  • Bubble cutting circuits

    Publication Year: 1974, Page(s):1071 - 1079
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2456 KB)

    An inhomogeneous applied field can cause an instability in a strip domain that can be used for the controlled generation of bubble domains. These instabilities have been studied experimentally and theoretically by means of a variational calculation. Good agreement is obtained between wall shape calculations and experimental data. Predictions of cutting current as a function of strip width deviate,... View full abstract»

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  • Wall placement in a cross-tie memory element

    Publication Year: 1974, Page(s):1079 - 1081
    Cited by:  Papers (1)
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    Methods of placing parallel domain walls in magnetic films for a cross-tie memory are described, and a new technique is proposed which involves magnetic annealing at an elevated temperature after the film has been fabricated. View full abstract»

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  • Transient and steady-state velocity of domain walls for a complete range of drive fields

    Publication Year: 1974, Page(s):1081 - 1084
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Approximate analytic solutions for transient and steady-state 180° domain-wall motion in bulk magnetic material are obtained from the dynamic torque equations with a Gilbert damping term. The results for the Walker region in which the transient solution approaches the familiar Walker steady-state solution are presented in a slightly new form for completeness. An analytic solution correspondin... View full abstract»

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  • On the temperature dependence of disturb properties in plated wire

    Publication Year: 1974, Page(s):1084 - 1089
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Theory relating the temperature coefficient of the zero point and digit disturb threshold to the random anisotropy field is discussed. Certain assumptions about the relationship between the random anisotropy of ripple theory and the uniaxial anisotropy field yield relationships that predict the temperature sensitivity of these properties fairly well in Permalloy films. The temperature dependence o... View full abstract»

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  • Quasi-static switching of plated wires in external magnetic fields

    Publication Year: 1974, Page(s):1089 - 1091
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Switching thresholds of plated wires were determined with slowly applied external magnetic fields, using both torquemeter and ac techniques. The samples included wires having helical easy-direction angles of 0°, 24°, 30°, and 60°. A study was made of the dependence of switching threshold HCon the angle θ between applied field and wire axis. Good agreement was fo... View full abstract»

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  • Magnetic hysteresis model

    Publication Year: 1974, Page(s):1091 - 1096
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A dynamical model is described which permits calculation of the excitation current I as a function of time in a laminated grain-oriented (G-O) steel transformer core. The independent variable is the magnetic flux density or, equivalently, the coil voltage less the IR drop associated with the resistance View full abstract»

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  • Calculation of eddy currents in linear motor geometries--A two-dimensional integral equation approach

    Publication Year: 1974, Page(s):1097 - 1099
    Cited by:  Papers (1)
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  • Design considerations of superconducting magnets as a Maglev pad

    Publication Year: 1974, Page(s):1099 - 1103
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Design considerations are made on the superconducting magnet as a Maglev pad. The superconducting magnet, called L-type because of its geometry, has two superconducting coils. One is vertically oriented for thrust and guidance, while the other is horizontally oriented for suspension, in one cryostat. The two superconducting coils are both 4 m in length, extremely long in comparison with those that... View full abstract»

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  • Fields in electrical devices containing soft nonlinear magnetic materials

    Publication Year: 1974, Page(s):1103 - 1108
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The Colorado method for the solution of the non-linear form of Laplace's, Poisson's, and the diffusion partial differential equations is explained. Various boundary conditions can be satisfied. The transformation of the partial differential equation into a large set of finite difference equations is given. The discretization is based on a grid system consisting of two sets of orthogonal grid lines... View full abstract»

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  • Nonlinear analysis of the magnetic flux distribution in the magnetized magnet stabilized in air

    Publication Year: 1974, Page(s):1109 - 1113
    Cited by:  Papers (4)
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    A theoretical model for the relationship among magnetic quantities describing the one- versus two-dimensional field in a permanent magnet is developed. The model is applied to two problems: 1) determination of the direction of the residual magnetism and 2) finding the magnetic flux distribution in a magnet stabilized in air. The vector potential equation in a form unified for both problems is deri... View full abstract»

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  • Finite element analysis of the magnetic field distribution inside a rotating ferromagnetic bar

    Publication Year: 1974, Page(s):1113 - 1118
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Finite element analysis techniques are being used widely to predict the field distribution in magnetic structures having complex boundary geometries and nonlinear B-H characteristics. In situations where two or more magnetic fields interact, care must be taken to ensure that the principle of superposition applies before adding the fields directly. The magnetic Reynolds number can be used to predic... View full abstract»

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  • A field-theoretical approach to magnetic induction heating of thin circular plates

    Publication Year: 1974, Page(s):1118 - 1125
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A field-theoretical approach is used to analyze the subject of magnetic induction heating of thin circular plates by planar coils. Closed-form solutions for the electric and magnetic fields are found to the basic field problem of a single circular loop carrying current at a frequency ω in the presence of a plate characterized by a permeability μ and conductivity σ. By using these fi... View full abstract»

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  • Precision code-and voltage-to-resistance converters

    Publication Year: 1974, Page(s):1126 - 1129
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    An all-electronic system for automatic setting of the transfer coefficients of operational amplifiers in analog and hybrid computers is described. It is built on the basis of magnetic semiconductor code- and voltage-to-resistance converters. The main features in which the system differs from the conventional types [1] - [3] are the use of internal long-term memory and nonprecision resistors. This ... 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