High frequency magnetic permeability of nanocomposite film

TL;DR

This study models the high frequency magnetic permeability of nanocomposite films with ferromagnetic nanoparticles, revealing their potential for high permeability in microwave applications.

Contribution

It introduces a theoretical model for the magnetic permeability tensor of nanocomposite films considering dipole interactions and solves the Landau-Lifshitz-Gilbert equation.

Findings

Nanocomposite films can exhibit high magnetic permeability at microwave frequencies.

Permeability depends on frequency, temperature, particle density, and magnetic anisotropy.

The model provides insights into designing materials with desired magnetic properties.

Abstract

The high frequency magnetic permeability of nanocomposite film consisting of the single-domain spherical ferromagnetic particles in the dielectric matrix is studied. The permeability is assumed to be determined by rotation of the ferromagnetic inclusion magnetic moments around equilibrium direction in AC magnetic field. The composite is modeled by a cubic array of ferromagnetic particles. The magnetic permeability tensor is calculated by solving the Landau-Lifshits-Gilbert equation accounting for the dipole interaction of magnetic particles. The permeability tensor components are found as functions of the frequency, temperature, ferromagnetic inclusions density and magnetic anisotropy. The obtained results show that nanocomposite films could have rather high value of magnetic permeability in the microwave range.