Texture development as a function of film thickness (5-980 nm) was investigated for two series of CoslCr19 films. In general, the films were strongly textured. The orientation ratio, OR,, was used to describe the strength of the texture. Experimental data showed that for the Series A films (5-200 nm), the OR, value increased with increasing film thickness, while for Series B films (46-980 nm), the OR, as a function of the film thickness described a single peak curve, with its maximum near 130 nm. The calculated local orientation ratios OR, for both the Series A and B films had maxima near 110 nm. The strain in CO-Cr films also changes with the film thickness. In the case of the Series B films, the strain along the film normal gradually changed from a tensile to a compressive strain with increasing film thickness, and near 130 nm the film was in a stress-free condition. It was also discovered that for CO-Cr films thinner than 46 nm, the aspect ratio of the grains approaches 1 and the typical columnar structure of grains is not observed, although (0002) fibre texture still exists.

No abstract

Alumite was chosen as an ideal material to investigate the influence of particle interaction on the magnetic behaviour of a perpendicular anisotropic particle array. It was found that the measured reduced coercivity versus the reduced diameter curves fits the theoretical curling mode. However, the magnetic behaviour will no longer obey curling if the applied field deviates from the film normal. This is due to the presence of magnetic charge next to iron single-domain cylinders, which completely destroys the validity for curling. Their reversal can be interpreted from the superposition of Cos-type incoherent rotation and the magnetization reversal switched by the demagnetizing field and the dipole-dipole field.

No abstract