Tailoring the spin waves band structure of 1D magnonic crystals consisting of L-shaped iron/permalloy nanowires

G. Gubbiotti, R. Silvani, S. Tacchi, M. Madami, G. Carlotti, Z. Yang, Adekunle O. Adeyeye, M. Kostylev

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We have investigated both experimentally and numerically the magnonic band structure of arrays of closely spaced Fe/permalloy nanowires (NWs) with an L-shape cross-section using the Brillouin light scattering technique and GPU-based micromagnetic simulations. NWs consist of a 340 nm wide and 10 nm thick permalloy layer covered by a 170 nm wide Fe overlayer. The thickness of the latter was varied in the range from 0 to 10 nm in order to analyze its influence on the magnonic band structure. We found that both the frequency and the spatial profile of the most intense and dispersive mode, can be efficiently tuned by the presence of the thin Fe NW overlayer. In particular, by increasing the Fe thickness, one observes a substantial frequency increase, while the spatial profile of the mode narrows and moves to the permalloy NW portion not covered by Fe. In addition, the presence of the Fe overlayer causes a significant increase of the number of detected modes and a change of their intensity in the Brillouin spectra as a function of the Bloch wave number. These results show that it is possible to engineer the band structure of magnonic crystals consisting of bi-layered, L-shaped, NWs by a careful control of the overlayer thickness.

    Original languageEnglish
    Article number105002
    JournalJournal of Physics D: Applied Physics
    Volume50
    Issue number10
    DOIs
    Publication statusPublished - 9 Feb 2017

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    Spin waves
    Permalloys (trademark)
    Band structure
    magnons
    Nanowires
    nanowires
    Iron
    iron
    Crystals
    Brillouin scattering
    crystals
    profiles
    Light scattering
    engineers
    light scattering
    Engineers
    causes
    cross sections
    simulation

    Cite this

    Gubbiotti, G. ; Silvani, R. ; Tacchi, S. ; Madami, M. ; Carlotti, G. ; Yang, Z. ; Adeyeye, Adekunle O. ; Kostylev, M. / Tailoring the spin waves band structure of 1D magnonic crystals consisting of L-shaped iron/permalloy nanowires. In: Journal of Physics D: Applied Physics. 2017 ; Vol. 50, No. 10.
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    abstract = "We have investigated both experimentally and numerically the magnonic band structure of arrays of closely spaced Fe/permalloy nanowires (NWs) with an L-shape cross-section using the Brillouin light scattering technique and GPU-based micromagnetic simulations. NWs consist of a 340 nm wide and 10 nm thick permalloy layer covered by a 170 nm wide Fe overlayer. The thickness of the latter was varied in the range from 0 to 10 nm in order to analyze its influence on the magnonic band structure. We found that both the frequency and the spatial profile of the most intense and dispersive mode, can be efficiently tuned by the presence of the thin Fe NW overlayer. In particular, by increasing the Fe thickness, one observes a substantial frequency increase, while the spatial profile of the mode narrows and moves to the permalloy NW portion not covered by Fe. In addition, the presence of the Fe overlayer causes a significant increase of the number of detected modes and a change of their intensity in the Brillouin spectra as a function of the Bloch wave number. These results show that it is possible to engineer the band structure of magnonic crystals consisting of bi-layered, L-shaped, NWs by a careful control of the overlayer thickness.",
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    Tailoring the spin waves band structure of 1D magnonic crystals consisting of L-shaped iron/permalloy nanowires. / Gubbiotti, G.; Silvani, R.; Tacchi, S.; Madami, M.; Carlotti, G.; Yang, Z.; Adeyeye, Adekunle O.; Kostylev, M.

    In: Journal of Physics D: Applied Physics, Vol. 50, No. 10, 105002, 09.02.2017.

    Research output: Contribution to journalArticle

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    T1 - Tailoring the spin waves band structure of 1D magnonic crystals consisting of L-shaped iron/permalloy nanowires

    AU - Gubbiotti, G.

    AU - Silvani, R.

    AU - Tacchi, S.

    AU - Madami, M.

    AU - Carlotti, G.

    AU - Yang, Z.

    AU - Adeyeye, Adekunle O.

    AU - Kostylev, M.

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    N2 - We have investigated both experimentally and numerically the magnonic band structure of arrays of closely spaced Fe/permalloy nanowires (NWs) with an L-shape cross-section using the Brillouin light scattering technique and GPU-based micromagnetic simulations. NWs consist of a 340 nm wide and 10 nm thick permalloy layer covered by a 170 nm wide Fe overlayer. The thickness of the latter was varied in the range from 0 to 10 nm in order to analyze its influence on the magnonic band structure. We found that both the frequency and the spatial profile of the most intense and dispersive mode, can be efficiently tuned by the presence of the thin Fe NW overlayer. In particular, by increasing the Fe thickness, one observes a substantial frequency increase, while the spatial profile of the mode narrows and moves to the permalloy NW portion not covered by Fe. In addition, the presence of the Fe overlayer causes a significant increase of the number of detected modes and a change of their intensity in the Brillouin spectra as a function of the Bloch wave number. These results show that it is possible to engineer the band structure of magnonic crystals consisting of bi-layered, L-shaped, NWs by a careful control of the overlayer thickness.

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