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IEEE Transactions on Magnetics

Issue 1 • Date January 1975

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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  • Announcing the start of publication of six issues per year

    Publication Year: 1975, Page(s): 2
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  • Twisted domain wall structure for stripe domains in bubble films

    Publication Year: 1975, Page(s):3 - 11
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    A four-parameter variational model is used to calculate the properties of stripe domains in uniaxial magnetic films. The width of the stripes and the thickness of the walls between the stripes are allowed to vary. In addition, the effects of the demagnetizing fields across the walls are included by allowing the spins within the walls to twist out of the wall plane. It is shown that the presence of... View full abstract»

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  • Magnetization switching in a garnet thin film

    Publication Year: 1975, Page(s):12 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    An improved technique for observing subnanosecond magnetization changes in thin films has been used to study the underdamped oscillatory behavior in a (Y2.5Gd0.5) (Fe4Ga1)O12sample. The measurement setup uses a version of the alternate sampling technique in which the sensitivity has been upgraded by the use of a lock-in amplifier. By using a s... View full abstract»

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  • A new proposal on field-access bubble drives

    Publication Year: 1975, Page(s):16 - 20
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    This paper describes the results of driving bubbles with various rotating magnetic fields and proposes a triangulardrive method. This method is expected to furnish high power efficiency and simplification of the drive electronic circuit in practical magnetic-bubble memories. View full abstract»

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  • Magnetic bubble mass memory

    Publication Year: 1975, Page(s):21 - 25
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    An experimental magnetic bubble mass memory module complete with all control function and detection electronics has been built and operated. The module contains twenty-eight 16 448-bit mass memory chips and operates at a nominal rotating field frequency of 100 kHz. The module has an average access time of 2.7 ms, a read/write cycle time of 5.14 ms, and a data rate of 700 kbit/sec. A read error rat... View full abstract»

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  • Liquid magnetic bubbles

    Publication Year: 1975, Page(s):25 - 28
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    A liquid analog of a magnetic bubble domain shift register has been constructed, using ferrofluid and an immiscible liquid. Bubble sizes from 50 to 1000 microns have been observed, with propagation frequencies to 60 Hz and propagation velocities for 300 micron bubbles of up to 6 cm/ sec. Display applications for these phenomena are discussed. View full abstract»

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  • Dynamic crosstie nucleation thresholds for crosstie memory

    Publication Year: 1975, Page(s):29 - 30
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Pulsed magnetic fields (widths of 1 to 550 ns) with amplitudes above a threshold value will generate crossties [1] in Permalloy films (∼300 to 500 Å). Pulse width and film thickness affect the threshold values, which decrease with increasing pulse width and increasing film thickness. Fig. 2 shows typical behavior. View full abstract»

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  • The NDRW-characteristic of a plated wire memory element with an interlayer of tin

    Publication Year: 1975, Page(s):31 - 35
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Plated wire memory elements with good NDRW-characteristics can be produced by a sandwich diffusion technique. A thin layer of tin is placed between a smooth copper and the permalloy film and the wire has to be annealed before and after the plating of the permalloy. The reproducibility and the extrapolated long time stability were good. The parameters of this technology and the influence of the two... View full abstract»

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  • Magnetic wave propagation in a periodic medium

    Publication Year: 1975, Page(s):36 - 39
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The propagation of magnetic waves in an infinite medium with a periodic dielectric constant is studied as a simplified example to evaluate the applications of periodic structures. Specifically, the use of those structures for filtering and distributed feedback is investigated, and a new scheme for the generation of magnetic waves using drifting charges and a distributed feedback configuration simi... View full abstract»

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  • Calculation and optimization of the magnets for an electromagnetic levitation system

    Publication Year: 1975, Page(s):39 - 44
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The calculation of the static behavior of the magnets of an electromagnetic levitation system can be performed using a numerical field calculation method. The agreement of measured with calculated values is satisfactory. Besides the excitation losses of the magnets, there are also losses due to eddy currents in the rails. Some measurements, calculations, and important parameters for these eddy cur... View full abstract»

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  • The origin of the increase in magnetic loss induced by machining ferrites

    Publication Year: 1975, Page(s):44 - 50
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Ferrite inductors are usually made in two parts with mating and air gap surfaces perpendicular to the flux path. In the course of manufacture these surfaces are ground flat, and this machining operation is found to increase the loss factor (L.F.), ( \tan \delta _{r+F})/\mu_{e} , by up to 33%, measured at a frequency of 100 kHz. It is known that grinding puts ... View full abstract»

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  • Batch fabrication of thin film magnetic recording heads: A literature review and process description for vertical single turn heads

    Publication Year: 1975, Page(s):50 - 55
    Cited by:  Papers (22)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Several publications in the past have discussed the potential of batch fabricated thin film heads. Most of these publications dealt with theoretical predictions. Only a few discussed fabrication techniques and reported on the write and read test results. This paper describes a fabrication process for single turn thin film heads of vertical configuration. The process utilizes well known evaporation... View full abstract»

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  • Flux penetration and core loss in solid iron

    Publication Year: 1975, Page(s):55 - 60
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    A steady-state solution for the electromagnetic field in solid iron including both hysteresis and eddy-current effects is obtained by considering only fundamental components of flux density and magnetising force, expressed in terms of phasor vectors, and related by complex permeability. Static B/H loops for a material are used to give the complex permeability... View full abstract»

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  • Excitation current and power loss characteristics for mitered joint power transformer cores

    Publication Year: 1975, Page(s):61 - 64
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The 45° mitered-overlap joint is commonly used in the construction of large power transformer cores. There are several variables which affect the performance of such cores with respect to core loss and exciting current. The major variables investigated in this paper are 1) overlap distance, 2) stagger layer thickness, and 3) overlap method, namely, simple staggering versus step-lap. Also inve... View full abstract»

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  • Flux paths and flux transfer mechanism in the T joints of three phase transformer cores

    Publication Year: 1975, Page(s):65 - 71
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A better understanding of flux behavior within specific regions of a transformer core can lead to improved core design and magnetic efficiency. Flux paths and the flux transfer mechanisms have been determined for two practical T joints of different designs employed in two similar three-phase three limbed transformer cores. Each core was energized at three different core flux densities. The instant... View full abstract»

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  • Computer-aided design of ferroresonant voltage regulators

    Publication Year: 1975, Page(s):71 - 79
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    On the basis of known ferroresonant voltage regulator circuits with separate cores and with sinusoidal output waveforms, a new advantageous circuit has been suggested. This circuit has been used as an example of computer simulation of ferroresonant voltage regulators, especially in connection with the use of inverters. The principle of computer simulation and the doubtful advantage regarding the u... View full abstract»

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  • Comments on "Magnetic domain wall dislocation analogy and intrinsic coercivity"

    Publication Year: 1975, Page(s):81 - 82
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    First Page of the Article
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  • Analytic expression for the fringe field of finite pole-tip length recording heads

    Publication Year: 1975, Page(s):80 - 81
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Previous computations based on a conformal transformation are used as a guide in selecting a plausible magnetic scalar potential at the surface of the head. An analytic expression for the horizontal component of the field is obtained from this potential. Certain characteristics of the potential and field are discussed. View full abstract»

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  • Simple equations for the magnetization and reluctivity curves of steel

    Publication Year: 1975, Page(s): 81
    Cited by:  Papers (57)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The normal B-H curves of several types of steel are shown to be approximated by the equation H= (k_{1} e^{k_{2}B^{2}} + k_{3}) B . The reluctivity ( H/B ) and its derivative with respect to B are given by simple equations that are especially use... View full abstract»

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  • Correction to "On extremely high density digital recording"

    Publication Year: 1975, Page(s): 82
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE

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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology