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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 1999

Microwave polarizability of ferrite particles with non-uniform magnetization

Stéphane Labbé
EDP

Résumé

The microwave permeability of composites made of ferrite particles in a non-magnetic matrix is a!ected by particle shape and size. To account for the second e!ect, we have developed a micromagnetic model for calculating the microwave polarizability of a particle with non-uniform magnetization. This model is described in detail: a generalized demagnetizing operator associated with the equilibrium magnetic configuration inside the particle is introduced; the polarizability is defined as the perturbation of this con"guration by the external magnetic excitation; the permeability of a macroscopic sample is calculated using a space averaging procedure. The numerical methods are introduced and results for two systems are discussed: domain modes in thin "lms and ferrite composites with planar anisotropy.
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Dates et versions

hal-00086956 , version 1 (20-07-2006)

Identifiants

  • HAL Id : hal-00086956 , version 1

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Stéphane Labbé, Pierre-Yves Bertin. Microwave polarizability of ferrite particles with non-uniform magnetization. Journal of Magnetism and Magnetic Materials, 1999, 206, pp. 93-105. ⟨hal-00086956⟩
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