By Topic

IEEE Transactions on Magnetics

Issue 4 • December 1969

Filter Results

Displaying Results 1 - 25 of 36
  • [Front cover and table of contents]

    Publication Year: 1969, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (725 KB)
    Freely Available from IEEE
  • Richard M. Bozorth

    Publication Year: 1969, Page(s):690 - 691
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Advances in magnetics

    Publication Year: 1969, Page(s): 690
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Basic research and applications in magnetism

    Publication Year: 1969, Page(s):692 - 700
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1464 KB)

    Several brief case histories are recounted, to show how basic scientific discoveries of new materials and phenomena are used as necessary background for the design of modern devices. The essential elements in the follow-through from the discoveries to the useful devices are listed for six subjects used as examples: 1) rare earths for permanent magnets, 2) orthoferrite domain "bubbles" for memory, ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetooptics, lasers, and memory systems

    Publication Year: 1969, Page(s):700 - 716
    Cited by:  Papers (34)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2592 KB)

    The field of magnetooptics is reviewed and the application of a magnetic memory system as a readout technique is discussed. A review and comparison of the fundamental magneto-optic effects and their utility in a system is presented. It is shown for a longitudinal Kerr readout system that laser and shot noise limit wide-band (1 MHz) signal-to-noise ratios to about 40 dB. Media noise problems are re... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Magnetic oxide films

    Publication Year: 1969, Page(s):717 - 727
    Cited by:  Papers (97)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1528 KB)

    Polycrystalline and epitaxial magnetic oxide films have been fabricated by several investigators. This paper deals predominantly with epitaxial films grown by chemical vapor deposition. The majority of the discussion is concerned with substrates, the deposition process, and film characterization. Where possible, comparisons are made with bulk crystals and with films produced by other fabrication t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Plated-wire technology: A critical review

    Publication Year: 1969, Page(s):728 - 751
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3344 KB)

    Electrodeposited cylindrical magnetic film memory technology is reviewed. Extensive references are made to previous work. New data is given in areas not previously reported. Special emphasis is given to the following items: 1) Applications: Plated-wire applications cover the spectrum from 100 to 1000 ns cycle time NDRO memories of 105to 107bits capacity in commercial and mili... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Soft magnetic thin-film memory materials

    Publication Year: 1969, Page(s):752 - 764
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1488 KB)

    Thin-film deposition techniques as applied to magnetic memory applications are reviewed. The relationship between the microstructure of the film and the fabrication technique and pertinent parameters is discussed in terms of the atomistics of film nucleation and growth. The dependence of the magnetic properties governing switching of a magnetic storage element is qualitatively discussed in terms o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ferrite core planes and arrays: IBM's manufacturing evolution

    Publication Year: 1969, Page(s):764 - 774
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2248 KB)

    IBM's manufacture of arrays is reviewed in the context of advances in manufacturing techniques that have been made over the past ten years. Early methods of winding core planes and array jumpering are discussed briefly, and the present status is viewed in more detail. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ferrite memory materials

    Publication Year: 1969, Page(s):774 - 811
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4520 KB)

    A comprehensive review of the history and present status of ferrite memory materials is presented. The range of topics treated extends from the physical theories dealing with the origin of hysteresis loop squareness and the mechanism of flux switching to the technology of manufacturing memory cores. Themes that underlie the engineering, physics, and chemistry of memory cores are emphasized, partic... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Permanent magnet applications

    Publication Year: 1969, Page(s):812 - 821
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    The main uses of permanent magnets are covered either by the range of cast and magnetically treated alnico alloys or by the several grades of sintered barium/strontium hexaferrite, but minority materials have their special applications and continue to develop. Three different technical classes of permanent magnet applications can be distinguished. Firstly, magnets working in a magnetic circuit of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A critical review of magnetic recording materials

    Publication Year: 1969, Page(s):821 - 839
    Cited by:  Papers (27)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2800 KB)

    A review of the methods of preparation and the relevant properties of materials which the authors consider suitable for incorporation in conventional magnetic recording surfaces such as tapes, disks, drums, strips, and cards is provided. This field is presently dominated by one material, gamma ferric oxide in fine particle form, and so it is not surprising that this material is discussed at greate... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Semiconducting ferromagnetic spinels

    Publication Year: 1969, Page(s):840 - 848
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1344 KB)

    The family of spinel compounds of which CdCr2Se4is the prototype has been found to be simultaneously ferromagnetic and semiconducting. Numerous experiments reveal, moreover, that the electronic states in these materials are strongly coupled to the degree of magnetic order. The interaction between the electronic transport and the magnetic state offers the exciting possibility ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Josephson-type superconductive tunnel junctions and applications

    Publication Year: 1969, Page(s):848 - 873
    Cited by:  Papers (40)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2872 KB)

    The physics and applications of the Josephson effect are reviewed in detail. A brief introduction to superconductivity and tunneling is provided. The configuration most fully discussed is the oxide junction. However, properties of bridges, point-contacts, and solder-blobs are also described. Among the applications reviewed are magnetometers, infrared detectors, microwave generators and mixers, vol... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Phase transitions, soft modes, and critical fluctuations

    Publication Year: 1969, Page(s):874 - 886
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1416 KB)

    This paper gives an introductory review of the field of phase transitions. The first part contains a general discussion of the dynamical mechanism of phase transitions. The interactions between the particles are shown to yield a feedback effect in the collective response of the system to small external perturbations. This feedback provides the mechanism which can give rise to instabilities for cer... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theory of linear superposition in tape recording

    Publication Year: 1969, Page(s):886 - 890
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The conditions under which linear superposition (LSP) of isolated pulses is valid for the synthesis of multibit waveforms are examined theoretically. LSP is found to be valid subject to three conditions; first, that all the processes following the write process be linear operations on the tape magnetization; second, that the write field rise time be less than the bit interval; and third, that each... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of coating permeability in thin-film pulse recording

    Publication Year: 1969, Page(s):891 - 894
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A modified model of M(H) curves which uses a more realistic family of minor loops has been designed for a theory of pulse recording. The loops are defined by the initial and maximal permeability, \mu a and \mu m , as well as by the reversible permeability View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A method for calculating hysteresis loops of interacting single-domain particle systems in a nonmagnetic binder

    Publication Year: 1969, Page(s):895 - 898
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A method is given for calculating the minor and full hysteresis loops of a system of uniaxial single-domain particles with a common direction of easiest magnetization. A probabilistic approach is used in formulating the problem by means of two differential equations which are solved for the simple case of an infinite particle chain. The method is based on a model in which each particle is characte... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Hot pressed GdIG for magnetooptic memory application

    Publication Year: 1969, Page(s):898 - 901
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper describes the preparation of polycrystalline GdIG by hot pressing and reports the most relevant properties of the material. Hot pressed samples were prepared using various conditions of time (1 to 20 hours), temperature (900 to 1300°C), and pressure (300 to 1000 kg/cm2). Dense specimens with grain diameter ranging from 1 to 10μm were prepared. Thin wafers made by se... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Hard magnetic two-phase Co-Cu thin films

    Publication Year: 1969, Page(s):901 - 904
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The magnetic properties of sputtered films of 25 Co-75 Cu and 50 Co-50 Cu before and after annealing were investigated. In the as-sputtered state the films exhibit the structure of a metastable fcc solid solution. Annealing at 500 to 700°C causes decomposition into two phases, Cu and fcc 89 Co-11 Cu. The decomposition supposedly occurs by heterogeneous nucleation at the grain boundaries, and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Frequency tripler with very little input-current distortion

    Publication Year: 1969, Page(s):905 - 908
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A three-phase output frequency tripler is presented which operates with very little input-current distortion. In a conventional frequency tripler, filters for eliminating the higher harmonics in the input current must be placed in the primary lines. The frequency tripler described in this paper has a mechanism which suppresses the higher harmonics. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An unorthodox transformer for free-running parallel inverters

    Publication Year: 1969, Page(s):908 - 912
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Limitations imposed on free-running parallel inverters by the interdependence of critical characteristics of the networks, transformers, and switching elements of these inverters are identified. The transformer's role within these networks with abruptly changing circuit configurations is related to the network's functional mechanism. Special attention is devoted to forms of "volatile" returnable e... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A 1.5 × 105bit low-current high-speed planar-magnetic-film memory with high-storage density

    Publication Year: 1969, Page(s):912 - 917
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The access and cycle time limits and storage capacity limits of a DRO memory with planar magnetic films are estimated. Basing on these estimates, the concept of a magnetic-film memory of high-storage density is developed which operates on low-drive currents and allows high operating speeds. The magnetic films, the storage element structure, and the drive lines required for realizing the memory pla... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fabrication of grouped magnetic heads

    Publication Year: 1969, Page(s):918 - 920
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A new magnetic transducer has been developed for use in the measurement of mechanical displacement. Experiments suggest that the transducer could be used for various purposes: for instance, readout information from magnetic drums or disks of computers, nondestructive readout from thin-film memories, magnetic pattern recognition, and an unconventional flux sensor. The transducer is composed of flux... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Torque exerted on anisotropic magnetic medium by electromagnetic wave

    Publication Year: 1969, Page(s):921 - 924
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The possibility of exerting a torque with a nonzero time average value as a result of interaction of a plane electro-magnetic wave with anisotropic magnetic medium is discussed. The torque per unit volume produced by the action of the magnetic field on the magnetization of the medium is T = M \times H and it arises from the fact that the vector of magnetizati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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