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IBM Journal of Research and Development

Issue 1 • Date Jan. 1998

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Displaying Results 1 - 12 of 12
  • The magic of magnetic multilayers

    Publication Year: 1998, Page(s):3 - 6
    Cited by:  Papers (3)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (371 KB)

    In recent years there has been a renaissance in the study of magnetic multilayers—primarily because of the discoveries of enhanced or giant magnetoresistance [1, 2] and oscillatory interlayer exchange coupling [3] in magnetic multilayered structures consisting of alternating thin ferromagnetic and nonferromagnetic metallic layers. These discoveries have led to intense theoretical and experi... View full abstract»

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  • Oscillatory magnetic properties

    Publication Year: 1998, Page(s):7 - 24
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1618 KB)

    The recent discovery of oscillations in interlayer exchange coupling as a function of nonmagnetic spacer layer thickness has led to a widespread interest in oscillatory magnetic properties in layered structures for both basic and applied reasons. In this overview, several oscillatory magnetic properties are discussed for a particular model system. We have chosen epitaxial fcc Co films grown on Cu(... View full abstract»

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  • Theory of exchange coupling in magnetic multilayers

    Publication Year: 1998, Page(s):25 - 32
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    Two layers of magnetic materials separated by a nonmagnetic “spacer” layer display an exchange coupling between the separated magnetic layers, as detailed by the papers on experimental aspects of magnetic multilayers in this issue. Here we describe from a personal perspective the current theoretical understanding of exchange coupling in magnetic multilayers. The understanding by this... View full abstract»

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  • Electronic states in magnetic nanostructures

    Publication Year: 1998, Page(s):33 - 42
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (877 KB)

    This paper provides a survey of electronic states in magnetic nanostructures, how they differ from bulk states, and how these changes are related to interesting magnetic phenomena such as oscillatory coupling and giant magnetoresistance (GMR). After explaining the role of quantum well states and spin-dependent electron reflectivity in magnetic multilayers, we turn our attention to lower-dimensiona... View full abstract»

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  • The role of molecular beam epitaxy in research on giant magnetoresistance and interlayer exchange coupling

    Publication Year: 1998, Page(s):43 - 52
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (932 KB)

    In this paper, we review the contributions which MBE (molecular beam epitaxy) has made to the field of GMR (giant magnetoresistance) and interlayer exchange coupling in magnetic multilayers and sandwiches. A historical overview is given and a key advantage of MBE over alternative preparation techniques is emphasized: the ability to probe in situ the growth and structure of these materials. Recent ... View full abstract»

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  • Theory of spin-dependent conductivity in GMR materials

    Publication Year: 1998, Page(s):53 - 72
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1662 KB)

    This paper presents a critical review of theoretical studies of spin-dependent conductivity in GMR (giant magnetoresistive) materials. Earlier studies used relatively simple models of the electronic states and energy-band structure. Several more recent calculations of electronic transport in layered materials are based on ab initio treatment of the spin-dependent energy bands and Fermi surface. By... View full abstract»

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  • Magnetic properties of transition-metal multilayers studied with X-ray magnetic circular dichroism spectroscopy

    Publication Year: 1998, Page(s):73 - 88
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1291 KB)

    The detailed understanding of the magnetic properties of transition-metal multilayers requires the use of state-of-the-art experimental techniques. Over the last few years, the X-ray magnetic circular dichroism (XMCD) technique has evolved into an important magnetometry tool. This paper is an overview of the principles and unique strengths of the technique. Aspects covered include the quantitative... View full abstract»

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  • Magnetotransport in doped manganate perovskites

    Publication Year: 1998, Page(s):89 - 102
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1111 KB)

    Recent progress in oxide perovskite thin-film technology has led to the discovery of a large negative magnetoresistance at room temperature in doped manganate perovskite thin films. These films may have potentials for magnetic sensing applications. In this paper we review the basic phenomena and physics of magnetotransport in this class of materials. We also discuss our recent demonstration of a l... View full abstract»

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  • Recent IBM patents

    Publication Year: 1998, Page(s):151 - 160
    IEEE is not the copyright holder of this material | PDF file iconPDF (562 KB)
    Freely Available from IEEE
  • Terrestrial cosmic ray intensities

    Publication Year: 1998, Page(s):117 - 140
    Cited by:  Papers (45)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1643 KB)

    Cosmic rays may cause soft fails in electronic logic or memory. The IBM Journal of Research and Development, Volume 40, No. 1, discussed this complex event in detail. In order to predict electronic fail rates from cosmic particles, it is necessary to know the local cosmic ray flux. This paper reviews the penetration of cosmic rays through the earth's atmosphere, and the parameters which affect the... View full abstract»

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  • Recent publications by IBM authors

    Publication Year: 1998, Page(s):141 - 150
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (829 KB)

    The information listed here is supplied by the Institute for Scientific Information and other outside sources. Reprints of the papers may be obtained by writing directly to the first author cited. Journals are listed alphabetically by title; papers are listed sequentially for each journal. View full abstract»

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  • Design, fabrication, and performance of spin-valve read heads for magnetic recording applications

    Publication Year: 1998, Page(s):103 - 116
    Cited by:  Papers (7)  |  Patents (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1071 KB)

    Since the early 1990s, the introduction of dual-element recording heads with inductive write elements and magnetoresistive (MR) read elements has almost doubled the rate of areal density improvements for hard-disk-drive data storage products. In the past several years, prospects of even more rapid performance improvements have been made possible by the discovery and development of sensors based on... View full abstract»

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The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center