Interelement spacing and angle effects on magnetic reversal in permalloy arrays

H. Koo, C. Krafft, R. D. Gomez

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    As high density integration of magnetic devices are realized, the role of interaction between small single domain islands becomes a very important concern. In a previous paper (IEEE Trans. Magn. vol.37, p.2049-2051, (2001)), we established that interconnected 30 nm thick Ni81Fe19 segments switch at a single field and the process appears to be governed by parallel rotation as described by modified Jacobs-Bean chain-of-spheres model. In this study, we focus on the switching characteristics of interelement submicron Ni81Fe19 segments as a function of spacing. A salient result is the increase of the switching field with decreasing spacing between the segments reaching the maximum value for zero spacing. Interestingly when the segments overlap, the switching field becomes lower than the maximum. In disjointed segments, effective external field is a combination of applied field and the monopolar stray-field from neighboring islands. In connected segments arrays, the spin-spin interaction dominates so that the switching field is determined by the reverse nucleation field at the ends of the array. We also investigated the reversal behavior of the connected segments as a function of the angle, α and the external field, H. The switching field dependence on α is also shown. The reversal field reaches minimum at 45°. A coherent rotation model which includes the effect of the array geometry will be used to explain these trends.

    Original languageEnglish
    Title of host publicationINTERMAG Europe 2002 - IEEE International Magnetics Conference
    EditorsJ. Fidler, B. Hillebrands, C. Ross, D. Weller, L. Folks, E. Hill, M. Vazquez Villalabeitia, J. A. Bain, Jo De Boeck, R. Wood
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    ISBN (Electronic)0780373650, 9780780373655
    DOIs
    Publication statusPublished - 2002
    Event2002 IEEE International Magnetics Conference, INTERMAG Europe 2002 - Amsterdam, Netherlands
    Duration: 2002 Apr 282002 May 2

    Publication series

    NameINTERMAG Europe 2002 - IEEE International Magnetics Conference

    Other

    Other2002 IEEE International Magnetics Conference, INTERMAG Europe 2002
    Country/TerritoryNetherlands
    CityAmsterdam
    Period02/4/2802/5/2

    Bibliographical note

    Publisher Copyright:
    ©2002 IEEE.

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering
    • Surfaces, Coatings and Films

    Fingerprint

    Dive into the research topics of 'Interelement spacing and angle effects on magnetic reversal in permalloy arrays'. Together they form a unique fingerprint.

    Cite this