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IEEE Transactions on Magnetics

Issue 5 • Date September 1975

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Displaying Results 1 - 25 of 173
  • [Front cover and table of contents]

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

    Publication Year: 1975, Page(s): 1070
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    Freely Available from IEEE
  • The new challenge of industrial research

    Publication Year: 1975, Page(s):1071 - 1073
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB)

    First Page of the Article
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  • Growth and properties of garnet films for storage application

    Publication Year: 1975, Page(s):1074 - 1078
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A discussion of the growth of garnet films by liquid phase epitaxy without rotation of the substrate is presented for magnetic garnet layers used as materials for bubble [(YSm)3(FeGa)5O12; (YLa)3(FeGa)5O12] and magneto-optical memories [(GdBi)3(FeGaAl)5O12]. The background of the experimental and com... View full abstract»

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  • Temperature stable self-biasing bubbles in double layer films

    Publication Year: 1975, Page(s):1079 - 1081
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    One of the most important problems for a self-biasing bubble (SBB) device is the temperature stability of the SBB diameter. The temperature dependence of the SBB diamater was calculated on the basis of the force stability condition of the SBB and proved to be proportional to the temperature dependence of the characteristic length of the top layer. The proportional coefficient depended on h/l and t... View full abstract»

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  • Determination of doses for ion implantation in garnet films

    Publication Year: 1975, Page(s):1082 - 1084
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The effects of doses in implanted magnetic garnets are investigated by means of magnetic modifications of the implanted layer. Experiments performed on materials with various magnetostriction coefficients and with different growth induced anisotropies show that the stresses are proportional to the ion dose. At high dosage levels an elastic-plastic transformation occurs followed by a progressive de... View full abstract»

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  • Hard bubble suppression and controlled state generation of one micron bubbles in ion-implanted garnet films

    Publication Year: 1975, Page(s):1085 - 1087
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Hard bubble suppression with proton and neon implantation was achieved in one micron Eu.8Tm2.2Ga.5Fe4.5O12films. The dose and energy required in these one micron bubble films are similar to that required in five micron bubble films, despite the fact that the one micron films have larger uniaxial anisotropy to be overcome with the induced magne... View full abstract»

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  • Stability of parallel stripe domains

    Publication Year: 1975, Page(s):1088 - 1090
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The stability of a periodic array of parallel stripe domains in LPE garnet films is investigate both theoretically and experimentally. The vehicle used is the confined region of the bubble lattice device [1] which allows the initialization of straight parallel stripes as well as allowing a variation in the period of the stripe domains. The domains are analyzed wlth respect to the stable number of ... View full abstract»

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  • Model for transient behavior in field gradient propagation of bubbles

    Publication Year: 1975, Page(s):1091 - 1093
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    We propose a new model for the interpretation of pulsed field gradient propagation of bubbles, based on recent high-speed photography measurements in Eu-Ga-YIG films. We propose that dynamic conversion, i.e. Bloch curve nucleation and expansion, occurs consistently in our films during propagation, giving rise to motion at a saturation velocity of order 1000 cm/sec; large net displacements are achi... View full abstract»

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  • Bubble deformations during translation

    Publication Year: 1975, Page(s):1094 - 1096
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Pulsed laser illumination has been used to record photographically the instantaneous shapes of hard and soft bubbles during translation. The bubbles were translated between a single pair of stripe conductors carrying parallel currents and were thus subjected simultaneously to translational and radial forces. Noncircular deformations of 2-, 3-and 4-fold symmetry were observed at intermediate and hi... View full abstract»

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  • Ferrimagnetic garnet films for magnetooptic information storage

    Publication Year: 1975, Page(s):1097 - 1102
    Cited by:  Papers (22)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Reversible magnetooptic memories are believed to compete favorably with magnetic bubble devices and CCD's if economic low-power light sources can be used. For optical information storage at data rates of >106bit/s and blocks of 103bit, memory materials are required exhibiting an optical recording sensitivity on the order of the photographic plate. The presented contributio... View full abstract»

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  • Magneto-optic insulators utilizing the optical activity of Co++(Td)

    Publication Year: 1975, Page(s):1103 - 1108
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Large magneto-optic effects are associated with the crystal field transitions of Co++(Td) in a variety of spinel oxides. In the oxides, the F and P crystal field bands peak at about 1.5 and 0.6 μm, respectively. Many iron-containing quaternary compounds (CoTxFe2-xO4) have transition temperatures above ambient. Here, T is a trivalent metal ion such a... View full abstract»

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  • Thermomagnetic writing in Gd-Co sputtered films

    Publication Year: 1975, Page(s):1109 - 1111
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A model for thermomagnetic writing in Gd-Co sputtered films at its compensation temperature is described. In the vicinity of the compensation temperature, the films have rectangular hysteresis loops with large values of coercive force. Spots are thermomagnetically written and erased by using a He-Ne laser in conjunction with an external magnetic field, and a diameter approximately of View full abstract»

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  • Epitaxially grown Bi-substituted iron garnet films for magneto-optic devices

    Publication Year: 1975, Page(s):1112 - 1114
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The growth conditions and magnetooptical properties of films of Bi-substituted iron garnets are described. The chemical composition of TmBiFe-Ga garnet films grown from a PbO,B2O3flux has been determined using the radiotracer technique of chemical analysis. The maximum value of the figure of merit (Faraday rotation per unit optical attenuation) found for these films is 2.5 de... View full abstract»

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  • Liquid phase epitaxy and magneto-optical properties at 1.152 µm and 1.064 µm of garnet films on GdGaG

    Publication Year: 1975, Page(s):1115 - 1117
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Several ferrimagnetic garnet compositions have been studied in view of their use in integrated optics. Films of (Sc,Ga):YIG, (Gd,Ga):YIG, (Pr,Ga):YbIG and (Pr,Bi,Ga):YbIG have been grown by liquid phase epitaxy on <111> GdGaG and fully characterized by classical and guided waves experiments at 1.152 and 1.064μm wavelengthes. View full abstract»

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  • Magneto-optic displays

    Publication Year: 1975, Page(s):1118 - 1120
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Both the monochromatic and white light performance of a magneto-optic display, using bismuth substituted iron garnets are discussed. It is shown that for monochromatic light, efficiencies up to 28% and contrast ratios up to 180:1 can be achieved. For a practical device, using a white light source, efficiencies up to 8% with contrast ratios in excess of 20:1 can be achieved. It is also shown that a... View full abstract»

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  • Field control of magneto-optic gratings

    Publication Year: 1975, Page(s):1121 - 1123
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The Faraday or Kerr rotation of the plane of polarization of light incident on adjacent magnetic domains has opposite sense. Thus light transmitted through a film containing stripe domains or reflected from it is diffracted, as by a grating. The period of such a grating can be controlled by the application of a uniform magnetic field. We report on experimental and theoretical work that explores th... View full abstract»

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  • Behavior of skew-bubbles in orthoferrites

    Publication Year: 1975, Page(s):1124 - 1126
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Optical and magnetic properties of orthoferrite platelets with the optical axis normal to the surface have been investigated. A simple calculation has been performed indicating that a considerable increase of optical contrast between domains magnetized in opposite directions can be expected in such platelets when compared to the contrast obtainable in platelets with the crystalline "c" axis perpen... View full abstract»

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  • Magneto-optic properties of particulate layers

    Publication Year: 1975, Page(s):1127 - 1129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Restriction of electron mean free path in small metallic particles leads to a modification of the bulk optical and magneto-optic constants. The effect of this restriction and particle shape on the effective macroscopic values of \bar{n} and \bar{Q} for a particulate layer are considered. Values of saturation polar Kerr r... View full abstract»

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  • Bubble domain propagation dynamics in field-access permalloy driving circuits

    Publication Year: 1975, Page(s):1130 - 1132
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    To improve the understanding of the bubble domain propagation a stroboscopic investigation of bubble displacement with a permalloy T-bar overlay was undertaken at various values of drive field rotation rate. In addition to stepwise change of bubble wall velocity, variation distortion of the bubble shape in the process of propagation and an asynchronous lag of the bubble relative to the drive field... View full abstract»

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  • Bubble dynamics in T-bar-type circuits

    Publication Year: 1975, Page(s):1133 - 1135
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A theoretical model for bubble propagation under T-bar type overlays due to an in-plane rotating field is developed. By making certain assumptions about the nature of the overlay magnetisation, it is shown that bubble driving forces can be readily calculated for a circular bubble of varying diameter moving freely in 2-dimensions. Expressions for the frictional forces acting on a bubble are derived... View full abstract»

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  • Single-mask bubble memories: Bit/Chip organization with decoding

    Publication Year: 1975, Page(s):1136 - 1138
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Progress in element and chip design of single-mask bubble chips, based on drive-field operation, is reported. Three new elements, which have been successfully operated, are presented. (i) The replicator copies bubble streams for one propagation direction; when used in combination with the sense of rotation of the drive field it can serve as a bit generator. (ii) The λ-creator can selectively ... View full abstract»

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  • Bubble circuit fabrication by electrodeposition

    Publication Year: 1975, Page(s):1139 - 1141
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Bubble domain memory chips with micron dimension patterns have been fabricated by additive electroplating through photoresist windows using the conductor first processing. Etching defines the detector strips and removes the plating base. The various fabrication steps are described and discussed. The uniformity of the plated films is good and gives a reasonable yield. Nonmagnetic underlayers were p... View full abstract»

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  • Electron-beam fabrication of high-density amorphous bubble film devices

    Publication Year: 1975, Page(s):1142 - 1144
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A low-temperature, all-vacuum process combined with electron-beam lithography suitable for single-level masking devices using 2-μm diameter amorphous bubble films has been developed. A test vehicle which uses 0.75-μm wide chevrons and 1-μm wide T.I bars in an 8,000- bit chip configuration, resulting in an areal density of 1×107bits/in2, was used. Important... View full abstract»

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  • Amorphous film magnetic bubble domain devices

    Publication Year: 1975, Page(s):1145 - 1147
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Operation of all functions in an 8000 bit bubble domain device with 107bit/in2storage density on an amorphous film has been achieved. High frequency data clearly establishes 1 MHz operation in the amorphous films and large wall velocities indicate that frequencies in excess of 10 MHz may be possible. Replicate-transfer switches were made to operate with currents of 12 ma and ... View full abstract»

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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