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Magnetics in Japan, IEEE Translation Journal on

Issue 1 • Date Jan.-Feb. 1994

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Displaying Results 1 - 25 of 33
  • [Front cover]

    Publication Year: 1994 , Page(s): c1
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  • List of contributors

    Publication Year: 1994 , Page(s): nil1
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  • [Breaker page]

    Publication Year: 1994 , Page(s): nil1
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  • Table of contents

    Publication Year: 1994 , Page(s): 1 - 2
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  • Opinion

    Publication Year: 1994 , Page(s): 3
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  • Microstructure, Magnetic Properties and Noise Performance of CoPt Thin Film Media

    Publication Year: 1994 , Page(s): 4 - 12
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3249 KB)  

    CoPt thin films sputtered under high and low Ar pressures were found to have different microstructures. Films deposited under high Ar pressures contained an amorphous phase with segregated oxygen. Those prepared under low Ar pressures exhibited Pt modulation within crystal grains, but did not contain an amorphous phase. The magnetic properties of low-Ar pressure films depended on the perpendicular... View full abstract»

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  • Study on High Resolution Single-Pole Head in Reproduction

    Publication Year: 1994 , Page(s): 13 - 20
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    A thin main-pole film is required for high linear densities in perpendicular magnetic recording. In our experiments, Co-Zr-Nb films of thickness 0.08 ¿m had sufficiently low coercivity, but their domain wall structure nevertheless changed from Bloch walls to cross-tie walls at thicknesses under 0.1 ¿m. We found that main poles with cross-tie walls had much lower reproduction sensitivity than did... View full abstract»

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  • Preparation of Fe-N Films by Sputtering with He Gas

    Publication Year: 1994 , Page(s): 21 - 25
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    Fe-N films were deposited on glass substrates by rf sputtering with a mixture of Ar, He and N2 gases. The relationship between the properties of the films and the plasma species was investigated by optical emission spectroscopy analysis. In the Ar+He+N2 plasma, many N2+ molecular ions were generated by He atoms in neutral excited metastable states throug... View full abstract»

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  • C Axis Orientation and Magnetic Properties of Barium Ferrite Films

    Publication Year: 1994 , Page(s): 26 - 31
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    Barium ferrite films with various crystal orientations were deposited by sputtering, and their magnetic properties were investigated. The film composition was changed with the position of the substrate. This composition change was partly caused by the changes in composition of the sputtered particles with changing emission angle during sputtering. Compared with particulate media with barium ferrit... View full abstract»

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  • MR Properties and Thermal Stabilities of Cu/Co/Cu/NiFe Multilayers

    Publication Year: 1994 , Page(s): 32 - 37
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    Cu/Co/Cu/NiFe multilayer films prepared by evaporation in an ultrahigh vacuum showed induced ferrimagnetism and giant MR properties. The slope of the linear part of the MR curve near zero field is sensitive to the coercive force and squareness ratio of magnetization of the NiFe layers. The maximum slope was 0.41 %/Oe for Cr(50Å)[Cu (50Å)/Co(10Å)/Cu(50Å)/NiFe(15Å)]×10. The annealing temperatu... View full abstract»

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  • Dependence of Magnetoresistance on Preparation Conditions and Annealing in Co/Cu Multilayers

    Publication Year: 1994 , Page(s): 38 - 43
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    The structure of sputter-deposited Co/Cu multilayer film depends strongly on such preparation conditions as the Ar gas pressure (PAr) and the substrate bias voltage (VB). For films deposited at VB=0 V, the interfaces were flat and the (111) plane orientation was good at low PAr. The (111) orientation was better for ¿30 V films than for 0 V films. The in... View full abstract»

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  • Magnetoresistance in Ni-Fe/Cu Multilayers

    Publication Year: 1994 , Page(s): 44 - 48
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (634 KB)  

    Ni80Fe20/Cu multilayer films were prepared on glass substrate by magnetron sputtering. The dependence of the magnetoresistance on the thickness of the Cu layer, the thickness of the Ni-Fe layer, the thickness of the buffer layers for Fe, Ni80Fe20 and Cu, and the number of bilayers, was investigated. The MR ratio peaked at dCu= 10Å, where the ... View full abstract»

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  • Magnetooptical Spectra in Pt-Ni Alloys and Multilayers

    Publication Year: 1994 , Page(s): 49 - 53
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (675 KB)  

    Pt-Fe, Pt-Co and Pt-NiCo alloys and multilayer films were prepared on a SiO2 substrate by the dc magnetron sputtering technique. The reflectivity spectra and magnetooptical Kerr spectra of these specimens were measured, and the diagonal and off-diagonal elements of the conductivity tensor were deduced. The results of this work are as follows: (1) The peak energy position of the magnetoo... View full abstract»

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  • Nonequilibrium Dynamics and Chaos of Domain-Wall Motion

    Publication Year: 1994 , Page(s): 54 - 58
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (753 KB)  

    The study of magnetic domain wall motion is important in both the field of power-magnetic microcores and in magnetic recording applications. The nonlinear differential equation for Bloch wall motion is obtained by modification of the Landau-Lifshitz-Gilbert equation. The terms of the nonlinear force of restitution and eddy current damping are added, and the equation is solved by using fourth order... View full abstract»

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  • Domain Structures and High-Frequency Response of Magnetization for CoNbZr Stripe Films

    Publication Year: 1994 , Page(s): 59 - 66
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3230 KB)  

    The domain structures and high-frequency response of the magnetization of amorphous soft magnetic CoNbZr films were studied, using the Bitter method and scanning Kerr-effect microscopy. A Lifshitz-type domain structure, characterized by wedge-shaped domains, was observed in the films (stripe-shaped, over 100 ¿m wide and 1 ¿m thick). The change in magnetization associated with 180° domain wall m... View full abstract»

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  • (110) [001] Grain Growth in Silicon Steel Sheets of 30 μm Thickness

    Publication Year: 1994 , Page(s): 67 - 72
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    Thin grain-oriented silicon steel sheets have the lowest iron loss at a thickness of 30 μm. We observed the recrystallization behavior and magnetic properties of 30 μm thick silicon steel sheets, and compared the results with those of 60 μm thick silicon steel sheets. The recrystallization processes in the two types of sheet were found to be different. The primary recrystal... View full abstract»

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  • New Servo System for Large Capacity Floppy Disk

    Publication Year: 1994 , Page(s): 73 - 79
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3301 KB)  

    A low-cost, simplified continuous servo system employing a single servo signal detector is proposed. The servo record on the media consists of two frequency components, and the higher frequency component has a different phase on alternate tracks. The tracking error is detected from the phase difference of the two frequency components extracted from the single servo detector. The system was inspect... View full abstract»

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  • Magnetic Properties and Film Structure of Multiple-Structure Multilayered Co/Pd Films

    Publication Year: 1994 , Page(s): 80 - 86
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (823 KB)  

    Co/Pd, Co/Pt and Co/Au multilayer films exhibit large perpendicular magnetic anisotropy. We studied multiple-structure, multilayer Co/Pd films, composed of a number of thin multilayer Co/Pd films with unity squareness ratio, stacked in a periodic structure, separated by thin nonmagnetic metallic Pd film layers. The magnetization curves of multiple-structure, multilayer films have multistage shapes... View full abstract»

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  • High-Speed Track Access Technique Based on Model Following Control for Disk Drives

    Publication Year: 1994 , Page(s): 87 - 94
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1101 KB)  

    This article discribes a model following control system enabling disk drives to achieve high-speed track access. In this kind of control system, a prediction from a model plays an important role in reducing access time. We propose a new reference model based on a numerical model of the VCM (voice coil motor) used as the disk drive actuator. Taking the VCM actuator dynamics into account, the refere... View full abstract»

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  • Head Pad Positioning Control System for Hard Disk Drives

    Publication Year: 1994 , Page(s): 95 - 102
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (963 KB)  

    High track densities and short access times have been achieved using an H¿ controller with a sector servo system. The authors studied the difference in control performance for a system designed using the weighted mixed-sensitivity problem and one designed using the four block problem. By designing a two-degrees-of-freedom controller using H2 optimal theory, fast seeking was ... View full abstract»

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  • Giant Magnetoresistance in NiFeCo/Cu Multilayers

    Publication Year: 1994 , Page(s): 103 - 109
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    NiFeCo/Cu multilayer films with NiFeCo buffer layers, prepared by rf magnetron sputtering, show a giant magnetoresistance (MR) effect which oscillates as a function of the Cu thickness. At the second peak of this oscillation, multilayer films have an MR ratio of 12% in fields as low as 50 Oe. The film structure and MR properties are stable with respect to annealing at temperatures up to about 300Â... View full abstract»

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  • Optimum Design of an Orthogonal Core Based on a Magnetic Circuit

    Publication Year: 1994 , Page(s): 110 - 115
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (707 KB)  

    The operating characteristics of parametric transformers and dc-ac converters with an orthogonal core depend heavily on the core shape. Accordingly, to obtain the optimal design for such devices, the quantitative relationship between the orthogonal core shape and the operating characteristics of the application device are determined. In this paper, the application characteristics are discussed ana... View full abstract»

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  • Soft Magnetic Properties and Corrosion Resistance of Nanocrystalline Fe-Al-Ta-C Films

    Publication Year: 1994 , Page(s): 116 - 123
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1074 KB)  

    The effect of addition of Al to sputtered nanocrystalline Fe-Ta-C films on the film structure, soft magnetic properties and corrosion resistance were investigated. Films were crystallized from an amorphous state to a nanocrystalline state in which ultra-fine TaC particles were dispersed. Most of the Al in the films was dissolved in ¿-Fe after crystallization. When the Al concentration was increas... View full abstract»

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  • Tb-Fe Sputtered Films with Large Magnetostriction for Use in Magnetomechanical Thin-Film Devices

    Publication Year: 1994 , Page(s): 124 - 128
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (666 KB)  

    We examined the magnetostriction and coercive force of amorphous Tb-Fe films sputter-deposited under different conditions (rf input power, Ar gas pressure, Tb content, etc.). Here we discuss the possibility of obtaining both soft magnetic properties and a large magnetostriction in this system. Soft magnetic properties and large magnetostriction were obtained simultaneously in sputtered Tb-Fe thin ... View full abstract»

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  • Magnetostriction of Sm-Fe Thin Films Fabricated by a Sputtering Method

    Publication Year: 1994 , Page(s): 129 - 133
    Cited by:  Papers (1)
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    The magnetostriction and magnetic properties of sputtered SmxFe100-x (3¿x¿54) thin films at room temperature were investigated. Films had an amorphous structure for x¿12. The magnetostriction ¿ of the films increased rapidly under weak fields (≪1 kOe) and reached maximum values in the range 130 to 160×10¿6 at 16 kOe for x=30 to 40, suggesting that Sm-F... 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.

Full Aims & Scope

Meet Our Editors

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