Magnetic and Diffusional Properties of Compositionally Modulated Amorphous Fe(C)/Si Alloys

Magnetic and diffusion properties of compositionally modulated a-Fe80C20/a-Si were investigated as functions of the modulation wavelength. It was found that 1) samples with 3.8-6.9 Ã… magnetic Fe(C) layers were paramagnetic at low temperatures; 2) when Fe(C) layers were separated by thick Si layers, the temperature dependence of the magnetization was linear; 3) samples with Fe(C) layers thicker than 18 Ã… showed a T³/² temperature dependence of the magnetization; 4) wvhen Fe(C) thickness was held at 18 Ã… and the Si thickness varied, the Hc decreased with the modulation wavelength; and 5) Fe-Si interdiffusion was directly observed.