GHz Range Absorption Properties of ε-Fe[sub 3]N/Y[sub 2]O[sub 3] Nanocomposites Derived from Y[sub 2]Fe[sub 17] Intermetallic Compounds

The electromagnetic wave absorption properties of nanocomposites were characterized in a frequency range of 0.05-20.05 GHz. The imaginary part of relative permeability exhibited two types of resonance mechanisms: the domain wall and spin rotational resonances, over a 0.5-10 GHz range. The real part and imaginary part of relative permittivity almost kept a low constant in a region of 0.5-10 GHz, respectively. As a result, the resin composites with 80 wt % powders exhibited excellent electromagnetic wave absorption properties dB) in a frequency range of 0.6-4.4 GHz, with thickness of 3.3-19.3 mm. A minimum reflection loss of −55 dB was observed at 1.8 GHz with an absorber thickness of 7.05 mm.