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IEEE Transactions on Magnetics

Issue 3 • May 1980

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Effect of conductor crossings on propagation margins

    Publication Year: 1980, Page(s):489 - 497
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1800 KB)

    The effects of conductor delineation technique on magnetic bubble propagation across the conductor edge are described. Propagation margins are obtained for bubble circulation around 18-μm diameter Permalloy discs which cross four edges of an Al-Cu feature. Specifically investigated are isotropic wet etching, anisottopic wet etching to achieve a uniform taper, ion beam milling, and metal lift-... View full abstract»

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  • Complementary permalloy bubble propagation structure

    Publication Year: 1980, Page(s):497 - 501
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Field-access bubble propagation has been achieved in a novel Permalloy structure made up of a pattern and its complement. The pattern is defined by a step in a nonmagnetic spacer on top of which the Permalloy is deposited leaving the Permalloy in two levels. The two layers act in concert to provide coherently travelling potential wells for bubble propagation. The stepped structure is fabricated us... View full abstract»

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  • Wavelength response of harmonic distortion in AC-bias recording

    Publication Year: 1980, Page(s):501 - 506
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Wavelength response of harmonic distortion in ac-bias recording is analyzed. The wavelength response is affected in both the record and playback processes. In the record process tape nonlinearity and magnetization phase shift, which is dependent on signal-field intensity, are taken into account. In the playback process, tape thickness, tape-to-head spacing, gap length, etc. axe taken into account.... View full abstract»

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  • Statistical analysis of signal and noise in magnetic recording

    Publication Year: 1980, Page(s):507 - 513
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    A general theory is developed for the power spectrum of the induced voltage at the read head in magnetic recording, originating from the particulate nature of the tape. The theory is general in that it yields the signal power as well as the noise spectrum, including the effects of clustered particulate media. The statistics of all relevant parameters such as particle length, particle magnetic mome... View full abstract»

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  • Fatigue softening and hardening in mild steel detected from Barkhausen noise

    Publication Year: 1980, Page(s):514 - 517
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The measurement of Barkhausen noise is used to follow the fatigue process in a mild steel. The variation in the root-mean-square (rms) value of the noise with bending stress during single-strain cycles and in unloaded samples is determined at several stages of fatigue life. The fatigue softening and hardening are found to be sensitively revealed by specific changes in the shape and area of the noi... View full abstract»

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  • Magnetic properties of 6.5-percent Si-Fe filament formed by a modified taylor technique

    Publication Year: 1980, Page(s):517 - 520
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A modified Taylor technique for forming 6.5-percent Si-Fe filament has been developed. The filament is much more ductile than the bulk 6.5-percent Si-Fe alloy and can be formed into wound cores easily. High permeability is maintained for frequencies up to 100 kHz for filaments with diameters of less than 100 μm. This material could be used in high-frequency magnetic cores. View full abstract»

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  • The Fe-B-C ternary amorphous alloys

    Publication Year: 1980, Page(s):521 - 525
    Cited by:  Papers (25)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The properties of amorphous Fe-B-C alloys have been studied. The replacement of boron by carbon reduces the thermal stability of alloys containing more than approximately 80-percent iron, increases the Curie temperature slightly, and decreases the slope of the magnetization-temperature curve. Thus, although the low-temperature saturation magnetization decreases on replacement of B by C, as expecte... View full abstract»

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  • Low-cobalt Cr-Co-Fe magnet alloys obtained by slow cooling under magnetic field

    Publication Year: 1980, Page(s):526 - 529
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The permanent magnet properties of magnetic field aged Cr-Co-Fe alloys containing 5-9 weight percent (wt %) Co were investigated. By slow cooling from above the spinodal temperature under applied magnetic field, energy products of (BH)max= 4-6 MG . Oe were obtained. The effects of cobalt content, cooling rate, and applied magnetic field strength were studied. View full abstract»

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  • Further studies of the miscibility gap in an Fe-Cr-Co permanent magnet system

    Publication Year: 1980, Page(s):529 - 533
    Cited by:  Papers (39)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (773 KB)

    The miscibility gap of an Fe-Cr-Co system is further examined by monitoring the microstructures and the magnetic properties of the alloys. It is shown that the shape of the miscibility gap is not parabolic but of a peculiar shape, protruding to the Fe side along the Curie temperature. The part of the protrusion of the miscibility gap is called the "ridge" because of its shape resemblance. It is de... View full abstract»

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  • Transformation kinetics of the ferromagnetic alloy Mn-Al-C

    Publication Year: 1980, Page(s):534 - 536
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (503 KB)

    Mn1-x-yAlxCyforms a ferromagnetic metastable tetragonal τ-phase in the composition range0.42 leq x leq 0.47and0 leq y leq 0.021. Its high unaxial magnetocrystalline anisotropy makes it an interesting candidate for a permanent magnet. In order to investigate the kinetics of the transformations which occur in this system, we established the... View full abstract»

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  • Magnetostrictive properties of rare earth-iron Laves phase materials prepared by powder metallurgy techniques

    Publication Year: 1980, Page(s):536 - 540
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A powder metallurgical approach has been utilized for preparation of highly magnetostrictive rare earth-iron Laves phase compounds. The results of dilatometric studies indicate that the liquid-phase sintering kinetics are in reasonable agreement with the concept of a phase boundary reaction as the rate-limiting factor. Magnetic powder orientation prior to sintering is found to improve magnetostric... View full abstract»

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  • The spatial distribution of flux waveform across the limbs in a three-phase transformer core

    Publication Year: 1980, Page(s):540 - 544
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A scale model of three-phase three-limbed transformer cores, in which the magnetic path length varied significantly within the width of the limbs, was instrumented to observe the flux distribution in the laminations. Across the width of the center limb the local field was found to decrease monotonically with distance from the window and was minimum at the middle of the limb. In the outside limbs t... View full abstract»

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  • FFT calculation of magnetic fields in air coils

    Publication Year: 1980, Page(s):545 - 549
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The magnetostatic field produced by an air coil that possesses one-dimensional periodicity can be expressed as a one-dimensional discrete convolution of two functions. The first function expresses the field produced by a single turn of the coil. The second is a shape function; it expresses the spatial position and strength of current of each turn of the coil. The discrete convolution of these two ... View full abstract»

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  • Correction to "Sink-float separators using permanent magnets and water based magnetic fluid"

    Publication Year: 1980, Page(s): 549
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (46 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1980, Page(s): 0
    Cited by:  Papers (1)
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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