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IEEE Transactions on Magnetics

Issue 2 • Date March 1979

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

    Publication Year: 1979, Page(s): 0
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  • Temperature distributions in a megabit bubble chip

    Publication Year: 1979, Page(s):921 - 925
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    For a large-capacity large-size bubble chip, various operating parameter nonuniformities across the chip as well as garnet material and device processing inhomogeneities could be a source of considerable bias margin loss. An example is chip temperature nonuniformity due to detector heating. In an attempt to estimate the chip margin loss due to local temperature nonuniformities, temperature distrib... View full abstract»

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  • Rotating gradient measurement of bubble dynamics

    Publication Year: 1979, Page(s):926 - 930
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    A rotating gradient method is used to measure the steady-state bubble response under constant drive conditions. The rotating gradient drive is produced with alternating currents in a single-level conductor configuration. In response the bubble propagates at constant speed along a magnetooptically observed circular trajectory. A measurement of the trajectory diameter and the bubble's azimuthal posi... View full abstract»

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  • Dynamic behavior of bubble domains at low drive field

    Publication Year: 1979, Page(s):930 - 935
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Dynamic properties of bubble domains at low drive pulse field are examined by the bubble transport method. Important findings are as follows. 1) The bubble does not move unless the pulse duration exceeds a critical value which depends on the pulse amplitude. 2) A minimum pulse amplitude is also required for the bubble translation which depends on the pulse duration. 3) As the pulse duration goes t... View full abstract»

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  • The helical-scan magnetic tape recorder as a digital communication channel

    Publication Year: 1979, Page(s):935 - 943
    Cited by:  Papers (25)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    The properties of a magnetic tape recorder are viewed in terms of a digital magnetic recording/playback channel which exhibits fading (reduction of playback-signal level) and nonlinear behavior. A method is presented whereby channel nonlinearity may be quantified in a format useful for signal and receiver design. Measurements show this nonlinearity to be relatively small for symmetric two-level si... View full abstract»

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  • Susceptibility and structure of metallo-proteins and model systems

    Publication Year: 1979, Page(s):943 - 947
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The interest in the study of the diamagnetic properties of the whole molecule and/or the magnetic moment of metal ions bound in relation to the structure and function of proteins is briefly outlined. The advantages in using high-resolution superconducting magnetometers are described together with the main features of the experimental technique and its foreseen advancement. A few examples, as repre... View full abstract»

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  • Permanent magnetic materials with low reversible temperature coefficient

    Publication Year: 1979, Page(s):948 - 950
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Permanent magnets made from SmCo5exhibit negative reversible change in magnetization with increasing temperature, typically of the order of 0.04% per deg C between -100 and +200°C. For certain special applications in precision instruments such as gyros and accelerometers, it is highly desirable to improve this property. Earlier studies have shown that ternaries of the composition R... View full abstract»

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  • Cold-formable Cr-Co-Fe alloys for use in the telephone receiver

    Publication Year: 1979, Page(s):950 - 957
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Six alloys based on the Cr-Co-Fe system have been developed which can be cold-drawn into cups, heat treated to form magnets with energy products in the range 1.5 to 1.8 million gauss-oersteds. Such magnets have been fabricated into ring-armature-type receivers which can be used in the telephone handset. The alloys are based on the composition 28% Cr-15% Co-Fe with additions of Zr, Al, Nb, Ti, V, a... View full abstract»

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  • Structure and magnetic properties of directionally solidified Bi-MnBi eutectic alloys

    Publication Year: 1979, Page(s):957 - 966
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1976 KB)

    An alloy containing about 2 at% Mn and 98 at% Bi should solidify at 230°C to give a eutectic consisting of about 3 vol % ferromagnetic MnBi in a matrix of diamagnetic Bi. Directional solidification of this alloy produces a structure of elongated parallel MnBi rods with diameters from 0.1 to 1.5 μm, decreasing with increasing growth rate. Samples solidified slowly (growth rate less than 5... View full abstract»

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  • Thermal-magnetic properties of CrO2powder

    Publication Year: 1979, Page(s):967 - 969
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The principal thermal-magnetic characteristics of an unoriented assemblage of CrO2particles were measured. The majority of these measurements were made at low fields where an approximately linear field behavior was found. A phenomenological description is presented to explain the experimental results and extend their application to practical uses. View full abstract»

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  • Low-field magnetic properties of wide Fe-Ni metallic glass strips

    Publication Year: 1979, Page(s):970 - 972
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Wide samples of continuous-cast metallic glass ribbons fabricated to tape-wound or punched-ring core configurations are shown to possess the same attractive low-field magnetic properties as are observed in narrow ribbons of similar composition. Annealing ring-laminated cores in crossed fields leads to lower core loss than for metallic glass (wide or narrow) annealed only in a circumferential field... View full abstract»

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  • Effects of scratching on losses in 3-percent Si-Fe single crystals with orientation near

    Publication Year: 1979, Page(s):972 - 981
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2664 KB)

    The effects of scratching perpendicular to the [001] direction on losses were studied as a function of the tilt angle of the [001] out of the crystal surface β both with and without tensile stress in 3-percent Si-Fe single crystals. The reduction of the total losses by scratching becomes larger with decreasing β. The total losses of scratched samples further decrease with the application... View full abstract»

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  • Frequency dependence of iron losses in 4-percent Si-Fe single crystal with

    Publication Year: 1979, Page(s):981 - 988
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1352 KB)

    Losses under ac field excitation have been measured as a function of frequency and induction for a View full abstract»

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  • Axial particle trajectory measurements in high-gradient magnetic separation

    Publication Year: 1979, Page(s):989 - 991
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A technique has been developed for studying the trajectories of paramagnetic particles in a high-gradient magnetic separator. Human red blood cells are used as the paramagnetic particle and their trajectories in relation to a single magnetized stainless-steel wire are imaged. The flow velocity is parallel to the wire and has a value of approximately 50 μm . s-1. The magnetic field ... View full abstract»

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  • Magnetostatic energy of paramagnetic particles in magnetic separators

    Publication Year: 1979, Page(s):991 - 993
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A series expansion is obtained for the magnetostatic interaction energy of an infinitely long cylinder of arbitrary cross section, uniformly magnetized in a direction perpendicular to its long axis, and a spherical paramagnetic particle, in powers of the radius of the paramagnetic particle. For a cylinder of elliptic cross section magnetized in an arbitrary direction, the first three terms in this... View full abstract»

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  • Ferrofluid mist dynamics

    Publication Year: 1979, Page(s):994 - 996
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Various magnetographic printers have been based on the use of micron-sized ferrofluid droplets to form images on paper. Pulsed laser photography is utilized to follow the droplet motion on ms to s time scales. The results agree with the predictions of a simple model. The only fitted parameter, the drop radius, has a value similar to the values found by other techniques. Results, combined with opti... View full abstract»

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  • Control of coercivity in NiFe films for single-level masking bubble devices

    Publication Year: 1979, Page(s):997 - 999
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Methods of reducing Hcin thick NiFe films deposited on evaporated Au have been studied for applications in conductor-first single-level masking bubble device fabrication. Results obtained using surface modification techniques, such as ion implantation, plasma etching, and semiconducting intermediate layers (TiOx) are described. In addition, the performance of actual 5-μm... View full abstract»

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  • Thermally activated domain wall motion

    Publication Year: 1979, Page(s):999 - 1001
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The slow motion of magnetic domain walls was investigated over the range 77 \leq T \leq 423 K. It is concluded that this slow motion is dominated by thermally activated unpinning of walls from crystal defects. View full abstract»

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  • Correction to "Modeling of field access bubble devices"

    Publication Year: 1979, Page(s): 1003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    First Page of the Article
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  • A five-region model for the edge-guided mode ferrite-loaded stripline isolator

    Publication Year: 1979, Page(s):1001 - 1003
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A five-region model for the inhomogeneously ferrite-loaded strip/microstrip isolator with loss loading on one side of the ferrite slab is presented. A ferrite slab between two infinite perfectly conducting planes is sided by a lossy sheet and a dielectric slab. The bias magnetization is taken to be perpendicular to the ground planes. The problem is solved approximately by replacing the lossy film ... View full abstract»

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  • Correction

    Publication Year: 1979, Page(s): 1003
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1979, 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