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Magnetics in Japan, IEEE Translation Journal on

Issue 6 • Date June 1989

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Displaying Results 1 - 13 of 13
  • [Front cover]

    Page(s): c1
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  • List of contributors

    Page(s): nil1
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  • [Breaker page]

    Page(s): nil1
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  • Table of contents

    Page(s): 345
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  • Photoinduced Effect on Magnetic Properties of Ion-Implanted YIG Thin Films--Resonance Field Dependence on Annealing Temperature in Hydrogen Atmosphere

    Page(s): 346 - 352
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    The photoinduced effect studied here is the decrease ¿Hp in the ferromagnetic resonance field of surface spin wave modes in an ion-implanted layer of YIG film during optical illumination. The H2+ or He+ implanted films were annealed in a hydrogen gas atmosphere. The results on annealing show various ¿Hp behavior caused by the implanted and diffused hydrogen, and the formation of a large anisotropy in the surface layer of the He+-implanted films. Proposed models for changes in the chemical reaction between hydrogen and ferrous ions, and the origin of the large anisotropy, are discussed. View full abstract»

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  • Simulation of Hysteresis Characteristics of Core Materials Using the Everett Function

    Page(s): 353 - 359
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    The recent development of methods for numerical analysis of the magnetic flux in electrical equipment has given rise to a need for an accurate characterization of magnetic hysteretic processes in core materials. In this investigation, the idea of the Everett function, which is an integral form of the Preisach density function, was applied to simulations of the hysteresis curves of core materials in use. The Everett function of various core materials was measured using a microcomputer-controlled hysteresis tracer, and a mathematical formulation of the function was obtained. The formula can predict the hysteresis curves of various materials with good accuracy. View full abstract»

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  • Magnetic Properties of Co-Si-B Amorphous Wires Prepared by Quenching In-Rotating Water Technique

    Page(s): 360 - 367
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    The authors measured the magnetic properties of Co-Si-B amorphous wire with negative magnetostriction, prepared by quenching in-rotating water, and results were compared with the properties of Fe wires with positive magnetostriction. The Co wire was found to exhibit large Barkhausen discontinuities as well as the Matteucci effect, as does Fe wire. It was also found that the Co wire has a bamboo-like domain pattern at the surface and has a reverse domain propagation mobility larger than the Fe wire. View full abstract»

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  • Reinforced Large Barkhausen and Matteucci Effects and Magnetoelastic Waves in Cold-Drawn and Then Torsion Annealed Amorphous Wires

    Page(s): 368 - 377
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    The authors propose new methods for reinforcing the large Barkhausen and Matteucci effects in amorphous magnetostrictive wires. Cold-drawn and then torsion-annealed (CDTA) wires (Fe77.5Si7.5B15, 50 ¿m dia.) generate AC voltage pulses ep' (Matteucci voltages) of between 35 and 75 mV across the ends of 200-mm long wires under 2 Oe, 60 Hz external fields. The critical wire length 1* for the large Barkhausen (LB) effect is about 25 mm, facilitating the construction of small-size field sensors. The critical field H* for the LB effect is 0.3 to 0.9 Oe. The value of ep'/l* for the CDTA wires is more than 200 times that of as-prepared 125 ¿m dia. wires. Magnetoelastic wave propagation characteristics are also remarkably improved in CDTA wires. View full abstract»

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  • Magnetostriction of Amorphous Fe-Y and (Fe-Co)0.8Y0.2 Alloys

    Page(s): 378 - 383
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    The magnetostriction of Fe1-xYx (0.2¿x¿0.6) and of (Fe1-x Cox)0.8Y0.2 (0¿x¿0.6) alloys has been measured in the temperature range from 20 to 300 K. In Fe-Y alloys, the magnetostriction ¿ is 2.8×10¿6 at 20 K when x=0.2, and decreases monotonically with increasing x and temperature. This magnetostriction in FeY alloys is the smallest among all Fe-based amorphous binary alloys investigated so far. In (Fe1-xCox)0.8Y0.2 alloys ¿ at room temperature shows a minimum of 1.0×10¿6 at x-0.3, at which the magnetization and coercive force are 125 emu/g and 0.05 Oe respectively. View full abstract»

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  • Magnetic Birefringence and Dichroism in Magnetic Fluid

    Page(s): 384 - 394
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    The magneto-optical effect in magnetic fluids is investigated. The phase difference ¿ between the ordinary ray and the extraordinary ray transmitted through the magnetic fluid thin film, was found to be described by the functional form ¿1f(H)/[T-T1 +f(H)], where H is the magnetic field applied to the magnetic fluid film, T is the absolute temperature of the film, f(H) is a certain increasing function of H, and T1 and ¿1 are positive constants. The field dependence of the optical transmissivity of magnetic fluid thin films is well described by the cluster model of ferrous colloidal particles in the applied field direction when the aggregation is small. The field dependence of transmissivity is, however, explained neither by the electric absorption of the clusters, nor by the Rayleigh scattering when the cluster becomes larger. The effect of diffraction by linear clusters oriented by the applied field must be taken into account in explaining the optical extinction. View full abstract»

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  • [Advertisement]

    Page(s): 395
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    Page(s): 396
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    Page(s): nil2
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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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Editor-in-Chief
James E. Opfer
Hewlett-Packard