IEEE Translation Journal on Magnetics in Japan

Issue 6 • Sept. 1985

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Displaying Results 1 - 25 of 49
  • [Front cover]

    Publication Year: 1985, Page(s): c1
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    Freely Available from IEEE
  • List of Contributors

    Publication Year: 1985, Page(s): nil1
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  • [Breaker page]

    Publication Year: 1985, Page(s): nil1
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  • Table of contents

    Publication Year: 1985, Page(s):653 - 654
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  • Ferrite Cores For Switching Regulator

    Publication Year: 1985, Page(s):655 - 663
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    In recent years, the growth of switched-mode power supply production has been truly remarkable. Applications for these efficient power sources have been found in computers, computer peripheral equipment, control devices, and other systems. With the rapid progress made in microelectronics, the need for ultracompact, high-efficiency switched-mode power supplies has spurred the development of smaller... View full abstract»

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  • Dust Cores for Switching Regulator

    Publication Year: 1985, Page(s):664 - 671
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    Dust cores were originally developed for use in carrier telecommunication inductors, but have been replaced by ferrite cores. At the same timie, high frequency switching is widely used in the regulators of compact electrical equipment. Duist cores have two main features: unsaturated magnetic flux densities under external magnetic fields, and low power losses. As a result they are widely used in re... View full abstract»

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  • Amorphous Alloy Cores for Switching Regulator

    Publication Year: 1985, Page(s):672 - 681
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1506 KB)

    Amorphous alloy applications for various magnetic devices have been investigated. This review discusses application of amorphous alloys in the magnetic cores of switching regulators, including magnetic amplifiers, spike killers, choke coils, and main transformers. Amorphous alloys are shown to be useful in raising performances and reducing the sizes of switching regulators. View full abstract»

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  • Perpendicular Magnetic Anisotropy in Gd-Co Films Prepared by Ion-Beam Sputtering

    Publication Year: 1985, Page(s):682 - 683
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB)

    The increase in perpendicular magnetic anisotropy in RF sputtered Gd-Co films with application of a negative bias voltage is thought to originate in structural changes due to resputtering effects. Dual-ion-beam sputtering was used to form Gd-Co films, and the relation between perpendicular magnetic anisotropy and resputtering was studied. In experiments using both dual-ion-beam sputtering and a si... View full abstract»

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  • Magnetic Properties of Amorphous Rare Earth-Transition Metal Alloy Films

    Publication Year: 1985, Page(s):684 - 685
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (209 KB)

    Changes in the average magnetic moment in sputtered Fe-Co film accompanying substitution of Co for Fe and the addition of Bi are reported. Average magnetic moments ¿TM were calculated from measured values of the saturation magnetization at 4.2 K. The dependences of ¿TM on the Co concentration y in Gd-Fe-Co-Bi, Gd-Fe-Co and Tb-Fe-Co films are described. Magnetic moments of individual atoms in the... View full abstract»

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  • Effect of Resputtering on Perpendicular Magnetic Anisotropy in Amorphous GdCo Thin Films

    Publication Year: 1985, Page(s):686 - 687
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (217 KB)

    In order to control resputtering during the sputtering formation of amorphous thin films, a wire mesh in DC sputtering equipment were used to suppress resputtering, and the effects of resputtering on magnetic anisotropy in GdCo films were studied. The measured values for Keff and Ms indicated that nearly all films had in-plane magnetizations, and under the film deposition conditions, th... View full abstract»

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  • Film Structures and Perpendicular Magnetic Anisotropy of RE-Fe Sputtered Films

    Publication Year: 1985, Page(s):688 - 690
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB)

    The relation of film structure to magnetic anisotropy of GdFe films, sputtered with different bias voltages VB, are reported. Films were sputtered under an Ar pressure of 10 mTorr at various bias voltages VB. Film structures for different VB were determined using X-ray diffraction and SEM observations. Changes in film properties after annealing in air indicated tha... View full abstract»

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  • Magneto-Optical Writing System with the Pulse Magnetic Field

    Publication Year: 1985, Page(s):691 - 692
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (634 KB)

    A pulse magnetic field was used successfully in magneto-optical writing of bits of size smaller than the diameter of the spot of light. Applying a pulse magnetic field to the medium, when the sum of the signal field and the diamagnetic field becomes larger than the coercive force, the magnetization in that area is inverted. Raising the pulse frequency caused the polarity to overlap with reverse ma... View full abstract»

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  • A New Type of Magneto-Optic Readout Head

    Publication Year: 1985, Page(s):693 - 695
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    A "domain-modulation-type optical reproduction head" is reported, in which the signal field is transmitted through a high permeability film to a readout magnetic film, which enlarges the domain and enables reproduction by laser light. Magnetic garnet was used as the readout film, and (60 to 300 μm thick) Permalloy as the high permeability film. In tests, the modulated domain width of the g... View full abstract»

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  • A New Magneto-Optic Transfer Readout with Magnetic Garnet Film

    Publication Year: 1985, Page(s):696 - 697
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (241 KB)

    Previous garnet film transfer readout methods suffered from drawbacks such as transfer domain disorder and slow response. Here a new type of transfer readout method, in which the domains of garnet film are formed into parallel stripes and the garnet film is placed close to the recording medium, so that leakage flux from the latter changes the garnet domain widths, which are detected by a laser rea... View full abstract»

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  • Compact Magneto-Optical Disk for Coded Data Storage

    Publication Year: 1985, Page(s):698 - 699
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    A compact magneto-optical disk drive compatible with current optical disk systems is reported. A tracking detection system enabling use with add-on (non-erasable) optical disks was adopted. High-speed accessing was accomplished by constructing the head from both stationary and moving mechanisms. Noise analyses showed that for large analyzer angles θA, Ndisk ≫ N... View full abstract»

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  • A Magneto-Optical Disk Testing System

    Publication Year: 1985, Page(s):700 - 701
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    A device for automatic measurement of bit error rates and identification of the position of errors in magneto-optical disks was constructed, and used in actual disk evaluations. The microcomputer-controlled device enables measurements on either individual tracks or on groups of tracks, and outputs bit error rates and error distributions. In actual tests, the bit error rate of grooved TbFeCo magnet... View full abstract»

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  • Recording Characteristics of Magneto-Optical Disk with Quadrilayer Structure

    Publication Year: 1985, Page(s):702 - 704
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (255 KB)

    The effects of recording sensitivity and recording conditions on bits recorded on sputtered four-layer GdTbFe film are reported. A correlation was seen between recorded bit length and film optical absorption per unit thickness. As films were made thinner, the resulting bit length grew longer and the film became more sensitive. Fluctuation in bit widths was minimum at a recording power of 5.1 mW an... View full abstract»

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  • Erasing Characteristics of Magneto-Optical Recording Media

    Publication Year: 1985, Page(s):705 - 707
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (239 KB)

    Erasing characteristics of magneto-optical media (thick TbFe film formed by triode RF sputtering on grooved plastic, with an SiO2 protective layer) are reported. Three disks, with varying Tb concentrations, coercivities and other properties, were used in experiments. Conditions for erasing prerecorded signals were determined for each of these disks; erasing was possible at the same powe... View full abstract»

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  • 25-Turn Thin-Film Magnetic Head

    Publication Year: 1985, Page(s):708 - 709
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (215 KB)

    A small coil pitch is necessary if the number of coil turns is to be increased without lengthening the magnetic yoke and decreasing head efficiency. The performance of a 25-turn thin-film head with a fine coil pitch of 5.5 μm is described, comparing it with a 16-turn, 7 μm pitch head. The head with the finer coil pitch had better current saturation and overwrite characteristics, an... View full abstract»

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  • Magnetization Distribution Analysis for Thin Film Heads

    Publication Year: 1985, Page(s):710 - 712
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    Taking into consideration the effect of leakage flux from the medium, an analysis of the curling state in the demagnetizing field was employed to study head film magnetizattion processes during readout of magnetically recorded signals. The analysis yielded values for the magnetostatic, anisotropy and Zeeman energies, as well as the angle of inclination θo of the magnetic moment ... View full abstract»

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  • Effect of Pole-Tip Shape on Recording Characteristics with Thin Film Magnetic Head

    Publication Year: 1985, Page(s):713 - 714
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    A number of thin-film magnetic heads with different pole shapes were constructed, and the resulting differences in performance were investigated. The lower poles of prototype heads had protrusions extending toward the medium surface, and positioned differently for different heads. Results indicated that such protrusions act both to reduce negative depressions in reproduced waveforms, and to enable... View full abstract»

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  • Reciprocal Action of Multilayered Permalloy Thin Films

    Publication Year: 1985, Page(s):715 - 716
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    A magnetoresistive (MR) sensor consisting of two pairs of multilayered (FeNi layers sandwiched between SiO2) MR elements was constructed, and the effects of the signal magnetic tilt angle, temperature, and input power on the sensor output were studied. Constant current driving was employed, taking advantage of a mutual bias effect, to obtain an output with small temperature dependence. ... View full abstract»

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  • Numerical Analyses on Laminated MR Heads

    Publication Year: 1985, Page(s):717 - 719
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (285 KB)

    Numerical analyses of the reproducing characteristics of laminated MR heads in perpendicular recording were conducted. The laminated head considered, consisting of two magnetoresistive (MR) elements enclosing a nonmagnetic conducting layer, was found to be highly sensitive and capable of reproduction at high recording densities. To obtain symmetrical reproduced waveforms, however, sense currents m... View full abstract»

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  • Magnetic Properties and Domain Observations for CoZr/NiFe Multilayer Films

    Publication Year: 1985, Page(s):720 - 722
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The magnetic properties and domain structures of amorphous Co90Zr10/ polycrystalline Ni81Fe19 (wt%) multilayer films, candidates for use as the pole pieces of thin-film heads, were investigated. After sputter-forming film samples in a 400 Oe magnetic field, they were annealed with a 480 Oe field either in the easy axis and then the hard axis directions, ... View full abstract»

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  • Properties of FeAl Soft Magnetic Thin Film

    Publication Year: 1985, Page(s):723 - 724
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The magnetic properties of FeAl alloy films, deposited by evaporation in a magnetic field, were studied to explore the possibility of their use in place of Permalloy in thin film recording heads. For Al concentrations of 20 to 30 at% or less, Ms values were large compared with those for Permalloy. Resistivity increased monotonically with Al concentration, while the hardness reached a ma... View full abstract»

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Aims & Scope

IEEE Translation Journal on Magnetics in Japan is a publication of the IEEE Magnetics Society published between 1985 and 1994.

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Meet Our Editors

Editor-in-Chief
James E. Opfer
Hewlett-Packard