Brillouin light scattering investigation of magnetostatic modes in symmetric and asymmetric NiFe/Cu/NiFe trilayered wires

G. Gubbiotti, Mikhail Kostylev, N. Sergeeva, M. Conti, G. Carlotti, T. Ono, A.N. Slavin, A. Stashkevich

    Research output: Contribution to journalArticle

    38 Citations (Scopus)

    Abstract

    The peculiarities of magnetostatic resonances of trilayered wires (700 nm wide) consisting of two ferromagnetic permalloy layers, coupled by dipolar interaction across a nonmagnetic Cu spacer, have been comprehensively studied both experimentally and theoretically. Both a symmetric structure, NiFe(30 nm)/Cu(10 nm)/NiFe(30 nm), and an asymmetric one, NiFe(10 nm)/Cu(10 nm)/NiFe(30 nm), were analyzed. Brillouin light scattering (BLS) from thermally excited spin waves, has been performed as a function of the incidence angle of light and of the intensity of the external applied field. A number of discrete peaks, corresponding to the resonant frequencies of the trilayered structures have been observed in BLS spectra. To achieve a satisfactory interpretation of the experimental results, substantial improvements of previous theoretical models were necessary. In this case, in fact, due to the rather large value of the ferromagnetic layers thickness, the dipole interaction between magnetic layers associated with the nondiagonal terms of the tensorial Green's functions (describing a dynamic dipolar magnetic field induced by one magnetic layer in the other one) gives significant contributions to the resonant frequencies.
    Original languageEnglish
    Pages (from-to)online - approx 5-20pp
    JournalPhysical Review B
    Volume70
    Issue number22
    DOIs
    Publication statusPublished - 2004

    Fingerprint Dive into the research topics of 'Brillouin light scattering investigation of magnetostatic modes in symmetric and asymmetric NiFe/Cu/NiFe trilayered wires'. Together they form a unique fingerprint.

    Cite this