Microwave permeability of flake-shaped FeCuNbSiB particle composite with rotational orientation

Flake-shaped FeCuNbSiB particles were fabricated by ball milling the annealed ribbons. The composites of flake particles/paraffin wax were prepared with and without rotational orientation in an applied magnetic field. The complex permeability of the composites was measured in the frequency range of 0.1–18 GHz. The oriented composite showed higher permeability and resonance frequency compared with the unoriented one, while its value of (μ0−1)fr reached 128.9 GHz and exceeded the Snoek’s limit. Considering random and uniform distribution of the flake planes of the particles in the unoriented and oriented composites, respectively, the real part and imaginary part of the complex permeability of the composites were calculated using the Landau–Lifshitz–Gilbert equation and Bruggeman’s effective medium theory. The calculated results were basically in agreement with the experimental data.

[1]  V. Bregar Effective-medium approach to the magnetic susceptibility of composites with ferromagnetic inclusions , 2005 .

[2]  Huahui He,et al.  Electromagnetic and microwave absorbing properties of iron fibre-epoxy resin composites , 2000 .

[3]  J. Xiong,et al.  Microwave-absorbing properties of de-aggregated flake-shaped carbonyl-iron particle composites at 2-18 GHz , 2006 .

[4]  Y. Wu,et al.  Influence of demagnetizing field on the permeability of soft magnetic composites , 2006 .

[5]  Zhongying Wang,et al.  Phase alignment and crystal orientation of Al3Ni in Al–Ni alloy by imposition of a uniform high magnetic field , 2008 .

[6]  Olivier Acher,et al.  Effective medium at finite frequency: Theory and experiment , 1993 .

[7]  M. Knobel,et al.  Structural and magnetic properties of nanocrystalline particles in an amorphous Fe73.5Nb3CuSi13.5B9 matrix , 2008 .

[8]  C. Brosseau,et al.  Effective magnetic permeability of Ni and Co micro- and nanoparticles embedded in a ZnO matrix , 2005 .

[9]  O. Acher,et al.  Correlation between magnetic properties of layered ferromagnetic/dielectric material and tunable microwave device applications , 2002 .

[10]  Y. Yoshizawa,et al.  New Fe-based soft magnetic alloys composed of ultrafine grain structure , 1988 .

[11]  Jun Ding,et al.  High frequency complex permeability of iron particles in a nonmagnetic matrix , 2006 .

[12]  L. Deng,et al.  Composition dependence of microstructure, magnetic and microwave properties in ball-milled FeSiB nanocrystalline flakes , 2008 .

[13]  J. L. Snoek Dispersion and absorption in magnetic ferrites at frequencies above one Mc/s , 1948 .

[14]  F. Wen,et al.  Bianisotropy Picture of Higher Permeability at Higher Frequencies , 2008 .

[15]  Christopher V. Jahnes,et al.  Magnetic properties of CoPtCr thin films with 〈112̄0〉 crystal orientation , 1991 .