Structure, ferromagnetic resonance, and permeability of nanogranular Fe-Co-B-Ni films

Massimo Pasquale, Federica Celegato, Marco Coisson, Alessandro Magni, Sergio Perero, Pavel Kabos, Valeria Teppati, Suk Hee Han, Jongryoul Kim, Sang Ho Lim

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    The static and microwave magnetic properties of soft nanogranular (Fe0.7 Co0.3) 71 B22 Ni films with a 2 T saturation magnetization are presented as functions of thickness, ranging from 136 to 235 nm. Microwave permeability values from 60 to 260 are measured and ferromagnetic resonance frequencies up to 6.8 GHz are found using a vector network analyzer, connected to coplanar/microstrip structures loaded with the ferromagnetic films. Topographic and magnetic structures down to 20-40 nm were observed by atomic/magnetic force microscopy. The combination of reasonable values of the permeability and high ferromagnetic resonance frequency makes these nanogranular materials useful in the development of inductive microwave components.

    Original languageEnglish
    Article number08M303
    JournalJournal of Applied Physics
    Volume99
    Issue number8
    DOIs
    Publication statusPublished - 2006

    Bibliographical note

    Funding Information:
    This work was partly supported by the Italy-Korea bilateral scientific cooperation program “Nanogranular magnetic films and devices for GHz frequency applications” funded by the Italian Ministry of Foreign Affairs and the Korean Ministry of Research.

    ASJC Scopus subject areas

    • General Physics and Astronomy

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