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IEEE Transactions on Magnetics

Issue 1 • Date March 1969

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

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • Annealing of cylindrical Ni-Fe films

    Publication Year: 1969, Page(s):2 - 6
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1408 KB)

    The effect of annealing on the microstructure of cylindrical electrodeposited 81-percent Ni, 19-percent Fe films was studied with the electron microscope. The films were deposited onto 5-mil Be-Cu wires having either Au or Cu intermediate layers. The annealing was performed on both free-standing films and on films still attached to the substrate. The initial change in the free-standing films was a... View full abstract»

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  • Magnetic properties of thin permalloy tapes annealed below recrystallization temperature

    Publication Year: 1969, Page(s):7 - 10
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    5Mo- and 9Cu-4Mo-Permalloys containing about 80- percent Ni were cold-rolled to tapes 8 μ in thickness and annealed below the recrystallization temperature. Hard cold-rolling of these Permalloys developed the easy axis with high squareness, and the hard axis with low residual induction. Induced anisotropy energy for 9Cu-4Mo-Permalloy tapes was reduced to \...
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  • Effects of skew and demagnetizing fields on NDRO performance

    Publication Year: 1969, Page(s):10 - 13
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Limitations placed upon the NDRO performance of a magnetic film memory device by the detrimental effects of skew and demagnetizing fields are investigated. An expression has been derived that relates these effects to the NDRO critical magnetization angle for devices whose rotational switching can be characterized by a Stoner-Wohlfarth switching astroid. Experimental results for typical devices are... View full abstract»

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  • A high-speed NDRO analog memory using electrodeposited permalloy wires

    Publication Year: 1969, Page(s):14 - 18
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    An NDRO analog memory was constructed with an electrodeposited Permalloy wire and tested to demonstrate that high speed, low power, and high stability are realized. The interrogation copper wire is wound around the deposited wire, and the wire is driven along the hard axis by a 225-kHz sinusoidal field. The center copper wire, on which Permalloy was deposited, is used for the memory setting and se... View full abstract»

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  • Optimization of the planar hall effect in ferromagnetic thin films for device design

    Publication Year: 1969, Page(s):18 - 22
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The planar Hall effect, although directly related to the magnetoresistance effect, differs in its potential uses by the disposition of the sensing electrodes allowing an internal balance of the excitation voltage drop. An experimental study of ferromagnetic thin film conditions of evaporation, film thickness, composition and shape of the electrodes has been undertaken. Anisotropic Ni-Fe films with... View full abstract»

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  • Computation of magnetic field produced by two plane-parallel keepered current straps

    Publication Year: 1969, Page(s):22 - 29
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    An integral/matrix-equation formulation is utilized to calculate the two-dimensional magnetic field produced by two plane and parallel keepered current straps. The mathematical formulation of the problem and its numerical solution are discussed in detail. Results are presented for the magnetic field inside and outside the permeable keepers, assuming different values for the thickness, width, and r... View full abstract»

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  • Laminated ferrite modular memory for 150-250-ns cycle operation

    Publication Year: 1969, Page(s):30 - 34
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The small element dimensions obtainable with laminated (monolithic) ferrite memory arrays suggest common packaging of the magnetic and semiconductor components to form compact self-contained modules. Coupling the modules with additional integrated circuit nets makes possible memories of megabit capacity with cycle times in the range of 150 to 250 ns. The modular system is described and evaluated f... View full abstract»

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  • High-speed characteristics of laminated ferrite memory planes

    Publication Year: 1969, Page(s):35 - 39
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The high packing density, low digit current, and partial switching mode characteristics of laminated (monolithic) ferrite memory planes make high-speed operation of the planes attractive. High-speed test data concerning switching time, back voltage, sense signal, and temperature effects are presented for ferrite laminates containing 64 by 64 conductors, spaced 15 mils between centers. Laminates of... View full abstract»

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  • The application of multistable magnetic cores for dialing purposes in telephony

    Publication Year: 1969, Page(s):40 - 43
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Multistable magnetic cores have the well-known property that a certain amount of flux, stored in the core, remains unchanged for a long time. This amount of flux can be broken down by feeding a number of voltage pulses, with a constant volt-second integral and the right polarity, to a core winding. Each of these readout pulses will lower the flux level in the core until there is no flux left, and ... View full abstract»

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  • A low inductance strip-line recording head

    Publication Year: 1969, Page(s):43 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A prototype high energy-efficiency recording head for use in a high packing density recording system has been developed. The operation of the head in the writing mode depends on the magnetic field round a thin strip conductor rather than flux leakage from the magnetic circuit as in a conventional ring-type head. The presence of ferrite in the vicinity of the strip increases the field produced for ... View full abstract»

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  • Efficiency of magnetic recorder heads

    Publication Year: 1969, Page(s):47 - 50
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    High-permeability alloys of the composition 80-percent Ni, 4-percent Mo, remainder Fe, are generally used for recorder heads. The annealing temperature for highest initial permeability in such alloys is 2150°F. This high annealing temperature is not desirable for recorder head laminations since it makes the laminations too soft. Theoretical guidelines for calculating the necessary permeabilit... View full abstract»

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  • A magnetic sense amplifier

    Publication Year: 1969, Page(s):51 - 55
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A new mode of operation of a balanced magnetic circuit is described. With this new mode of operation, which utilizes pulsed current excitation, the detection sensitivity of the magnetic modulator circuit is combined with the high-speed amplification of parametric buildup. This combination permits detection of low-level current pulses applied during a specified time interval of the excitation seque... View full abstract»

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  • Inductance of magnetically shielded air-core coils of circular cross section

    Publication Year: 1969, Page(s):56 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    An expression for the inductance of shielded cylindrical air-core solenoids of arbitrary diameter to length ratio is developed. Three shielding configurations are investigated: 1) the use of a coaxial-concentric magnetic shield, 2) the coaxial magnetic shield with conducting end plates, 3) the coaxial magnetic shield with conducting end rings. Case 2) is solved in closed form by separation of vari... View full abstract»

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  • The energetic equilibrium in the nonlinear ferromagnetic resonance

    Publication Year: 1969, Page(s):61 - 63
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The equilibrium between pump and scattered energy in nonlinear ferromagnetic resonance (NFMR) occurs as a result of the following mechanisms: 1) the nonlinear decrease in magnon lifetime owing to the increase of excited levels nk, and 2) the non-linear frequency shifting of the spin waveband owing to the decrease of the average magnetization of the crystal. Both of these mechanisms tend... View full abstract»

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  • Thermal noise from long sense lines

    Publication Year: 1969, Page(s):64 - 70
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A general treatment of the thermal noise produced by long, somewhat lossy sense lines of the type used in magnetic-film memories is presented. A graphical approach is described which can be used to determine the noise with arbitrary line termination. The comparison is made in a particular case for shorted versus matched resistive terminations, and it is found that the average noise is about the sa... View full abstract»

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  • Increment of coercive force in magnetic coupled structures - Application to magnetic memories

    Publication Year: 1969, Page(s):71 - 73
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (315 KB)

    First Page of the Article
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  • Gap irregularity effects in tape recording

    Publication Year: 1969, Page(s): 71
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    In all practical heads the gap deviates from straightness. Such irregularities reduce the output voltage. Assuming that a Gaussian distribution, of variance σ, describes the irregularities, the loss in output is shown to be (13 \sigma /\lambda )^{2} dB. Inordinate losses are avoided if the variance in each head be less than 0.1λ. View full abstract»

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  • Switching behavior of a square-loop ferrite core loaded by a series RL circuit

    Publication Year: 1969, Page(s):73 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    By use of the Neeteson approximation, design equations are developed from which the irreversible switching characteristics of a magnetic core working into a series RL load are predicted by numerical calculations. View full abstract»

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  • [Back cover]

    Publication Year: 1969, 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