Magnetic and Microwave Properties of Carbon-Coated Co- and Fe-Based Amorphous Wires

Rapidly quenched (Co
_0.94
Fe
_0.06
)
_72.5
Si
_12.5
B
₁₅
and Fe
₇₅
Si
₁₀
B
₁₅
wires, 6 mm in length, are compared before and after low-temperature surface condensation of carbon. Energy-dispersive X-ray spectroscopy indicates a change in surface morphology and elemental composition, which affects the initial quenching stress distribution in the near-surface atomic layers. A comparative analysis of microwave properties over a frequency range from 0.05 GHz to 10 GHz before and after surface modification suggests a decrease of the dispersion of the local magnetic anisotropy axes.