Magnetic properties of soft ferrites and amorphous ribbons up to radiofrequencies

Significant results are reported concerning the magnetic behavior of sintered soft ferrites and very thin Co-based amorphous ribbons up to 1 GHz. Conveniently field-annealed amorphous tapes can exhibit, in spite of their metallic character, superior combination of magnetic loss and permeability prop...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-05, Vol.322 (9), p.1497-1504
Main Authors: Fiorillo, F., Ferrara, E., Coïsson, M., Beatrice, C., Banu, N.
Format: Article
Language:English
Subjects:
Amorphous alloy
Amorphous and quasicrystalline magnetic materials
Anisotropy
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dissipation
Exact sciences and technology
Ferrites
Landau–Lifshitz–Gilbert
Magnetic loss
Magnetic properties
Magnetic properties and materials
Mathematical analysis
Nonmetallic ferromagnetic materials
Physics
Precession
Ribbons
Soft ferrite
Studies of specific magnetic materials
Tapes (metallic)
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Summary:Significant results are reported concerning the magnetic behavior of sintered soft ferrites and very thin Co-based amorphous ribbons up to 1 GHz. Conveniently field-annealed amorphous tapes can exhibit, in spite of their metallic character, superior combination of magnetic loss and permeability properties at all frequencies. Such properties are phenomenologically assessed through a physical approach based on the statistical theory of losses and the generalization of the related concept of loss separation, which takes into account different dissipation mechanisms and discriminates between domain wall and rotational processes. The latter, in particular, are described in ferrites in association with spin precession and damping and are given a formulation based on the Landau–Lifshitz–Gilbert equation and the assumption of distributed effective anisotropy fields.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2009.09.038