Observations of ferromagnetic resonance modes on FeCo-based nanocrystalline alloys

►The microwave permeability of FeCo-based nanocrystalline alloy particles/paraffin composites was measured and calculated in the range 0.5-18 GHz. ► The uniform and symmetric resonance modes have been deduced from micromagnetic equilibrium condition in the linear approximation. ►The uniform and symmetric resonance modes show good agreement with the experimental observation on FeCo-based nanocrystalline alloy.