3D analysis of magnetic anisotropies in OI and CVI films

S. Swaving, G.J. Gerritsma, J.C. Lodder, T.J.A. Popma

    Research output: Contribution to journalArticleAcademicpeer-review

    8 Citations (Scopus)
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    Abstract

    In this paper a general model is presented to describe torque curves for a thin magnetic film with two anisotropy axes. One axis is assumed to lie in the plane of the film, having first-order anisotropy only, whereas the other one, having first- and second-order anisotropy, makes an arbitrary angle with the normal to the film. Given the parameters of the model, explicit expressions can be derived for both in-plane as well as perpendicular torque measurements with an infinite magnetic field. With some restrictions analytical expressions are derived to obtain the model parameters from the Fourier coefficients of experimentally obtained torque curves. Furthermore several methods are discussed to obtain finite-field corrections, including a power series expansion in the inverse magnetic field of the Fourier coefficients. An analytical expression was also derived to determine the direction of the easy axis. The applicability of the model is tested on a metal evaporated tape and we found it gave a consistent and quite accurate description of the torque curves of such a film. With this three-dimensional model the accuracy of the determination of the material parameters increases considerably, especially for the relatively weak transverse anisotropy of the film.
    Original languageUndefined
    Pages (from-to)155-164
    Number of pages10
    JournalJournal of magnetism and magnetic materials
    Volume67
    Issue number2
    DOIs
    Publication statusPublished - 1987

    Keywords

    • SMI-TST: From 2006 in EWI-TST
    • TSTNE-Magnet-TMM: Torque Magnetometer
    • IR-66158
    • SMI-EXP: EXPERIMENTAL TECHNIQUES
    • EWI-5652

    Cite this

    Swaving, S. ; Gerritsma, G.J. ; Lodder, J.C. ; Popma, T.J.A. / 3D analysis of magnetic anisotropies in OI and CVI films. In: Journal of magnetism and magnetic materials. 1987 ; Vol. 67, No. 2. pp. 155-164.
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    title = "3D analysis of magnetic anisotropies in OI and CVI films",
    abstract = "In this paper a general model is presented to describe torque curves for a thin magnetic film with two anisotropy axes. One axis is assumed to lie in the plane of the film, having first-order anisotropy only, whereas the other one, having first- and second-order anisotropy, makes an arbitrary angle with the normal to the film. Given the parameters of the model, explicit expressions can be derived for both in-plane as well as perpendicular torque measurements with an infinite magnetic field. With some restrictions analytical expressions are derived to obtain the model parameters from the Fourier coefficients of experimentally obtained torque curves. Furthermore several methods are discussed to obtain finite-field corrections, including a power series expansion in the inverse magnetic field of the Fourier coefficients. An analytical expression was also derived to determine the direction of the easy axis. The applicability of the model is tested on a metal evaporated tape and we found it gave a consistent and quite accurate description of the torque curves of such a film. With this three-dimensional model the accuracy of the determination of the material parameters increases considerably, especially for the relatively weak transverse anisotropy of the film.",
    keywords = "SMI-TST: From 2006 in EWI-TST, TSTNE-Magnet-TMM: Torque Magnetometer, IR-66158, SMI-EXP: EXPERIMENTAL TECHNIQUES, EWI-5652",
    author = "S. Swaving and G.J. Gerritsma and J.C. Lodder and T.J.A. Popma",
    note = "Imported from SMI Reference manager",
    year = "1987",
    doi = "10.1016/0304-8853(87)90224-1",
    language = "Undefined",
    volume = "67",
    pages = "155--164",
    journal = "Journal of magnetism and magnetic materials",
    issn = "0304-8853",
    publisher = "Elsevier",
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    }

    3D analysis of magnetic anisotropies in OI and CVI films. / Swaving, S.; Gerritsma, G.J.; Lodder, J.C.; Popma, T.J.A.

    In: Journal of magnetism and magnetic materials, Vol. 67, No. 2, 1987, p. 155-164.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - 3D analysis of magnetic anisotropies in OI and CVI films

    AU - Swaving, S.

    AU - Gerritsma, G.J.

    AU - Lodder, J.C.

    AU - Popma, T.J.A.

    N1 - Imported from SMI Reference manager

    PY - 1987

    Y1 - 1987

    N2 - In this paper a general model is presented to describe torque curves for a thin magnetic film with two anisotropy axes. One axis is assumed to lie in the plane of the film, having first-order anisotropy only, whereas the other one, having first- and second-order anisotropy, makes an arbitrary angle with the normal to the film. Given the parameters of the model, explicit expressions can be derived for both in-plane as well as perpendicular torque measurements with an infinite magnetic field. With some restrictions analytical expressions are derived to obtain the model parameters from the Fourier coefficients of experimentally obtained torque curves. Furthermore several methods are discussed to obtain finite-field corrections, including a power series expansion in the inverse magnetic field of the Fourier coefficients. An analytical expression was also derived to determine the direction of the easy axis. The applicability of the model is tested on a metal evaporated tape and we found it gave a consistent and quite accurate description of the torque curves of such a film. With this three-dimensional model the accuracy of the determination of the material parameters increases considerably, especially for the relatively weak transverse anisotropy of the film.

    AB - In this paper a general model is presented to describe torque curves for a thin magnetic film with two anisotropy axes. One axis is assumed to lie in the plane of the film, having first-order anisotropy only, whereas the other one, having first- and second-order anisotropy, makes an arbitrary angle with the normal to the film. Given the parameters of the model, explicit expressions can be derived for both in-plane as well as perpendicular torque measurements with an infinite magnetic field. With some restrictions analytical expressions are derived to obtain the model parameters from the Fourier coefficients of experimentally obtained torque curves. Furthermore several methods are discussed to obtain finite-field corrections, including a power series expansion in the inverse magnetic field of the Fourier coefficients. An analytical expression was also derived to determine the direction of the easy axis. The applicability of the model is tested on a metal evaporated tape and we found it gave a consistent and quite accurate description of the torque curves of such a film. With this three-dimensional model the accuracy of the determination of the material parameters increases considerably, especially for the relatively weak transverse anisotropy of the film.

    KW - SMI-TST: From 2006 in EWI-TST

    KW - TSTNE-Magnet-TMM: Torque Magnetometer

    KW - IR-66158

    KW - SMI-EXP: EXPERIMENTAL TECHNIQUES

    KW - EWI-5652

    U2 - 10.1016/0304-8853(87)90224-1

    DO - 10.1016/0304-8853(87)90224-1

    M3 - Article

    VL - 67

    SP - 155

    EP - 164

    JO - Journal of magnetism and magnetic materials

    JF - Journal of magnetism and magnetic materials

    SN - 0304-8853

    IS - 2

    ER -