| Popis: |
The room temperature magnetic properties of amorphous Gd1−xFex films prepared by dc biased rf sputtering are reported. For low magnetization films made at a fixed bias, the wall energies are found to be nearly constant, regardless of the film magnetization. Also, no trend in Hk or Ku versus 4πMs and little trend in Ku with bias voltage can be discerned. The uniaxial perpendicular anisotropy appears to be induced by compressive stresses from the glass substrates. Such stresses are attributed to the deposition process and not to thermal contraction effects between the film and the substrate. The exchange constant is estimated to be 1.8×10−7erg/cm; the anisotropy energies are on the order of 4×104erg/cc. |
