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

Magnetic and diffusion properties of compositionally modulated a-Fe
80
C
20
/a-Si were investigated as functions of the modulation wavelength. It was found that 1) samples with 3.8-6.9 Å 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 Å showed a T
³
/
²
temperature dependence of the magnetization; 4) wvhen Fe(C) thickness was held at 18 Å and the Si thickness varied, the H
c
decreased with the modulation wavelength; and 5) Fe-Si interdiffusion was directly observed.