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

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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 May 29

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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