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IEEE Transactions on Magnetics

Issue 1 • March 1967

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1967, Page(s): 0
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    Freely Available from IEEE
  • Nondestructive readout in thick magnetic film devices

    Publication Year: 1967, Page(s):2 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    To study the nondestructive readout properties of thick magnetic film devices, sense voltages are computed for triangular interrogate word pulses. Eddy currents are assumed to be the exclusive damping mechanism. For a given pulse rise time one can obtain a maximum signal peak value with a given optimum film thickness, and the read signal of an optimized film can be approximated by simple analytica... View full abstract»

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  • Measurements and calculation for magnetically coated strip transmission lines

    Publication Year: 1967, Page(s):6 - 9
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Measurement of the transmission parameters of magnetically coated strip conductors over a ground plane show that the series componentsRandLvary rapidly with frequency. If these components are resolved into an alternative configuration consisting of a parallel and series arrangement, this frequency variation is almost entirely absent. Calculation of the pulse transmission prop... View full abstract»

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  • A three-phase magnetic amplifier: I--An analysis

    Publication Year: 1967, Page(s):9 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (610 KB)

    An analysis is presented of a 3-phase magnetic amplifier with bridge-connected output circuit and any number of series-connected and parallel-connected control windings. Approximate output difference equations are derived for two modes of operation representing one-half to minimum output and one-half to full output. These output difference equations express the dynamic relationship of the sixth-cy... View full abstract»

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  • A three-phase magnetic amplifier: II--Experimental results

    Publication Year: 1967, Page(s):17 - 22
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A model 3-phase magnetic amplifier is designed and tested to verify the theoretical analysis of Part I. The equivalent control circuit impedance and the core function of the magnetic material proposed are important factors in the determination of the response time and gain of the device. In addition, a feedback factor which is derived from the general analysis of an amplifier with both series-conn... View full abstract»

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  • A reliable high-powered constant current supply

    Publication Year: 1967, Page(s):22 - 28
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The use of series-connected saturable reactors operating in the constrained mode has proven to be a reliable and trouble-free means for developing constant current power such as that required by transoceanic cable systems. As the art has progressed towards the use of higher and higher ac power frequencies, however, it has become increasingly difficult to design a single ac power source of substant... View full abstract»

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  • An SCR frequency tripler

    Publication Year: 1967, Page(s):29 - 33
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (406 KB)

    The circuit and the operation of an SCR frequency tripler are described. The modes of operation are discussed and the circuit behavior is analyzed for different output conditions. An approximate equivalent circuit is used to describe the load conditions. Experimental results are shown for the open-circuited, short-circuited, and loaded frequency tripler. View full abstract»

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  • Analysis of a filter circuit for nonlinear loads

    Publication Year: 1967, Page(s):34 - 38
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (425 KB)

    A capacitor is connected in parallel with a saturated core coil assembly (a nonlinear load) to reduce the magnetizing current. A linear reactor is connected in series with supply to reduce the distortion in supply current. This typical reactor capacitor filter system has been analyzed by an iterative procedure based on harmonic equivalent circuits. The analysis presented here predicts the harmonic... View full abstract»

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  • A new approach in the analysis and design of a ferroresonant transformer

    Publication Year: 1967, Page(s):43 - 49
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    An analytical basis for the design of a ferroresonant transformer is developed. A normal ferroresonant transformer without any control winding is considered, and piece-wise linear approximations are assumed for the magnetization curve of the material. An equivalent electrical circuit for the secondary of the transformer is obtained, and the basic concept leading to the equivalent circuit is also d... View full abstract»

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  • Stability in three-phase magnetic/Electronic line voltage regulator

    Publication Year: 1967, Page(s):38 - 43
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Static, 3-phase, magnetic/electronic, line-to-line voltage regulators are frequently unstable because of an interaction between the separate regulators of each phase. A means of improving stability by establishing a signal path between the control circuits of each phase has been developed. Conventional means of improving stability, and the response of the regulator-to-line voltage modulation are r... View full abstract»

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  • Relationships between magnetic tape properties and magnetic oxide concentration

    Publication Year: 1967, Page(s):49 - 53
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    A series of tapes were coated in which the concentration of the magnetic ferric oxide was essentially the sole variable. Magnetic and electroacoustic properties were evaluated as a function of magnetic oxide concentration. The intrinsic coercivity was found to increase slightly with decreasing oxide concentration but not to the extent predicted by the simple packing factor law. Biasing current cha... View full abstract»

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  • Some annealing characteristics of electrodeposited permalloy wires

    Publication Year: 1967, Page(s):53 - 56
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (629 KB)

    Experiments have been carried out to evaluate the aging characteristics of electrodeposited permalloy memory films. It has been demonstrated that a worst case memory program is necessary for this purpose, as more fundamental magnetic measurements cannot be directly related to the memory performance. Aging is accelerated by annealing the specimens at elevated temperatures. It is found that degradat... View full abstract»

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  • Nondestructive readout by reversible flux changes

    Publication Year: 1967, Page(s):56 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (477 KB)

    A study has been made of nondestructive readout of multipath memory cores which depend for their operation on the difference between the remanent and demagnetized permeabilities. The output flux change of an experimental core was measured as a function of the flux change in the interrogate branch during interrogation. It was found that the output flux change is a nonlinear function of the flux cha... View full abstract»

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  • Detection and utilization of heat and infrared radiation emitted by magnetic elements during magnetic reversal

    Publication Year: 1967, Page(s):61 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB)

    In ferrimagnetic and ferromagnetic materials, various energy losses occur during the period of magnetic reversal. These losses, arising from eddy currents, hysteresis effects, domain-wall relaxation, and resonance phenomena, dissipate as heat and infrared radiation. Materials are available with which to build devices to detect this heat and infrared radiation and to provide electrical and/or visua... View full abstract»

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  • A wide bandwith, high-ratio, planar transmission-line transformer for use at cryogenic temperatures

    Publication Year: 1967, Page(s):64 - 71
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (905 KB)

    Transmission-line transformers are passive devices which can offer considerably higher gain-bandwidth products than their lumped circuit counterparts. Transmission-line transformers have been built and operated at liquid He temperatures using twisted-pair line wound on torroidal cores. We propose, however, constructing such a wideband transformer in a planar (deposited or etched) geometry. The way... View full abstract»

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  • A proposed beam-addressable memory

    Publication Year: 1967, Page(s):72 - 76
    Cited by:  Papers (37)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB)

    The feasibility of optical beam-operated magnetic storage systems is assessed. Recent advances in laser technology and in transparent magnetic materials are described along with methods for writing and reading information. In the writing process, thermomagnetic recording on thin films is considered and the writing speed and resolution is calculated, illustrating the large performance improvement o... View full abstract»

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  • A magnetic, thin-film, integrated circuit memory system

    Publication Year: 1967, Page(s):76 - 83
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1075 KB)

    A memory system comprising uncased integrated circuits, evaporated wires, and magnetic, thin-film storage elements has been fabricated and tested. The 1536-bit memory system is contained on one side of a 3-by 4 1/2-inch glass substrate. All system wiring on the substrate is formed by evaporating aluminum through masks. All system circuits are contained on 182 silicon chips, each 0.050-inch square,... View full abstract»

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  • The demagnetizing field in uniformly magnetized bodies of revolution

    Publication Year: 1967, Page(s):84 - 86
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    First Page of the Article
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  • Contributors and back cover

    Publication Year: 1967, Page(s): 0
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    Freely Available from IEEE
  • The decrease of wall creep in thin permalloy films by application of ferrite powder

    Publication Year: 1967, Page(s): 84
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 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.

Full Aims & Scope

Meet Our Editors

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