Surface and bulk magnetic behaviour of sputtered CoCr films

K. Hemmes, W.F. Lisowski, J.C. Lodder, L.J. Hanekamp, T.J.A. Popma

    Research output: Contribution to journalArticleAcademicpeer-review

    13 Citations (Scopus)
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    Abstract

    The magnetic hysteresis curve at the surface of RF- and magnetron-sputtered CoCr (81/19 at. %), in the thickness rang of 20-2500 nm, was measured with a rotating-analyser apparatus using the magneto-optic Kerr effect. The Kerr rotation of CoCr films (13-19 at.% Cr) decreases with increasing Cr content, and depends slightly on wavelength, showing a faint minimum between 550 and 600 nm. The surface hysteresis is compared with the bulk hysteresis as measured with a VSM. For RF films the maximum surface coercivity is higher than the bulk coercivity, being 120 and 95 kA m-1 respectively for 80 nm thick films but an abrupt decrease in only the surface coercivity was found at t = 125 nm. The coercivity of magnetron-sputtered CoCr deviates from that of RF-sputtered films. Until a maximum coercivity is reached at » 1 mm, the surface coercivity is about 20% higher, but at »2mm both coercivities decrease strongly. The existence of reversed domains within the main domains of CoCr is proposed, and the reversal mechanism is thought to be one in which the reversed domains grow at the expense of the main domain.
    Original languageUndefined
    Pages (from-to)1311-1320
    Number of pages10
    JournalJournal of physics D: applied physics
    Volume19
    Issue number7
    DOIs
    Publication statusPublished - 1986

    Keywords

    • IR-60572
    • EWI-5449
    • SMI-MAT: MATERIALS
    • SMI-TST: From 2006 in EWI-TST

    Cite this

    Hemmes, K., Lisowski, W. F., Lodder, J. C., Hanekamp, L. J., & Popma, T. J. A. (1986). Surface and bulk magnetic behaviour of sputtered CoCr films. Journal of physics D: applied physics, 19(7), 1311-1320. https://doi.org/10.1088/0022-3727/19/7/020
    Hemmes, K. ; Lisowski, W.F. ; Lodder, J.C. ; Hanekamp, L.J. ; Popma, T.J.A. / Surface and bulk magnetic behaviour of sputtered CoCr films. In: Journal of physics D: applied physics. 1986 ; Vol. 19, No. 7. pp. 1311-1320.
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    title = "Surface and bulk magnetic behaviour of sputtered CoCr films",
    abstract = "The magnetic hysteresis curve at the surface of RF- and magnetron-sputtered CoCr (81/19 at. {\%}), in the thickness rang of 20-2500 nm, was measured with a rotating-analyser apparatus using the magneto-optic Kerr effect. The Kerr rotation of CoCr films (13-19 at.{\%} Cr) decreases with increasing Cr content, and depends slightly on wavelength, showing a faint minimum between 550 and 600 nm. The surface hysteresis is compared with the bulk hysteresis as measured with a VSM. For RF films the maximum surface coercivity is higher than the bulk coercivity, being 120 and 95 kA m-1 respectively for 80 nm thick films but an abrupt decrease in only the surface coercivity was found at t = 125 nm. The coercivity of magnetron-sputtered CoCr deviates from that of RF-sputtered films. Until a maximum coercivity is reached at » 1 mm, the surface coercivity is about 20{\%} higher, but at »2mm both coercivities decrease strongly. The existence of reversed domains within the main domains of CoCr is proposed, and the reversal mechanism is thought to be one in which the reversed domains grow at the expense of the main domain.",
    keywords = "IR-60572, EWI-5449, SMI-MAT: MATERIALS, SMI-TST: From 2006 in EWI-TST",
    author = "K. Hemmes and W.F. Lisowski and J.C. Lodder and L.J. Hanekamp and T.J.A. Popma",
    note = "Imported from SMI Reference manager",
    year = "1986",
    doi = "10.1088/0022-3727/19/7/020",
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    volume = "19",
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    Hemmes, K, Lisowski, WF, Lodder, JC, Hanekamp, LJ & Popma, TJA 1986, 'Surface and bulk magnetic behaviour of sputtered CoCr films' Journal of physics D: applied physics, vol. 19, no. 7, pp. 1311-1320. https://doi.org/10.1088/0022-3727/19/7/020

    Surface and bulk magnetic behaviour of sputtered CoCr films. / Hemmes, K.; Lisowski, W.F.; Lodder, J.C.; Hanekamp, L.J.; Popma, T.J.A.

    In: Journal of physics D: applied physics, Vol. 19, No. 7, 1986, p. 1311-1320.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Surface and bulk magnetic behaviour of sputtered CoCr films

    AU - Hemmes, K.

    AU - Lisowski, W.F.

    AU - Lodder, J.C.

    AU - Hanekamp, L.J.

    AU - Popma, T.J.A.

    N1 - Imported from SMI Reference manager

    PY - 1986

    Y1 - 1986

    N2 - The magnetic hysteresis curve at the surface of RF- and magnetron-sputtered CoCr (81/19 at. %), in the thickness rang of 20-2500 nm, was measured with a rotating-analyser apparatus using the magneto-optic Kerr effect. The Kerr rotation of CoCr films (13-19 at.% Cr) decreases with increasing Cr content, and depends slightly on wavelength, showing a faint minimum between 550 and 600 nm. The surface hysteresis is compared with the bulk hysteresis as measured with a VSM. For RF films the maximum surface coercivity is higher than the bulk coercivity, being 120 and 95 kA m-1 respectively for 80 nm thick films but an abrupt decrease in only the surface coercivity was found at t = 125 nm. The coercivity of magnetron-sputtered CoCr deviates from that of RF-sputtered films. Until a maximum coercivity is reached at » 1 mm, the surface coercivity is about 20% higher, but at »2mm both coercivities decrease strongly. The existence of reversed domains within the main domains of CoCr is proposed, and the reversal mechanism is thought to be one in which the reversed domains grow at the expense of the main domain.

    AB - The magnetic hysteresis curve at the surface of RF- and magnetron-sputtered CoCr (81/19 at. %), in the thickness rang of 20-2500 nm, was measured with a rotating-analyser apparatus using the magneto-optic Kerr effect. The Kerr rotation of CoCr films (13-19 at.% Cr) decreases with increasing Cr content, and depends slightly on wavelength, showing a faint minimum between 550 and 600 nm. The surface hysteresis is compared with the bulk hysteresis as measured with a VSM. For RF films the maximum surface coercivity is higher than the bulk coercivity, being 120 and 95 kA m-1 respectively for 80 nm thick films but an abrupt decrease in only the surface coercivity was found at t = 125 nm. The coercivity of magnetron-sputtered CoCr deviates from that of RF-sputtered films. Until a maximum coercivity is reached at » 1 mm, the surface coercivity is about 20% higher, but at »2mm both coercivities decrease strongly. The existence of reversed domains within the main domains of CoCr is proposed, and the reversal mechanism is thought to be one in which the reversed domains grow at the expense of the main domain.

    KW - IR-60572

    KW - EWI-5449

    KW - SMI-MAT: MATERIALS

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

    U2 - 10.1088/0022-3727/19/7/020

    DO - 10.1088/0022-3727/19/7/020

    M3 - Article

    VL - 19

    SP - 1311

    EP - 1320

    JO - Journal of physics D: applied physics

    JF - Journal of physics D: applied physics

    SN - 0022-3727

    IS - 7

    ER -