Magnetization reversal in thin magnetic films with in-plane compensation walls

Self Cite

In preparing amorphous Gd–Co films by dc‐ and rf‐bias sputtering, systematic variations are found of the composition both in the direction of the film normal and in the film plane. Therefore, the bias sputtering process is analyzed in terms of a simple mass balance model. The formation of a target surface layer whose composition depends on the sputtering yields of Co and Gd and on the bias voltage can lead to the growth of a Co‐enriched initial layer in the film. The homogeneity in the film plane is determined by the radial variation of the transfer coefficient and of the ion current density at the substrate. The composition distribution in the plane is found to be different for dc‐ and rf‐bias sputtering due to different influences of the bias voltage on the ion currents.

Homogeneity of amorphous GdCo films prepared by bias sputtering

Knappe

Müller

Springmann

1978

Self Cite

Significance and interpretation of magnetic anisotropy measurements in amorphous Gd–Co films

Müller¹,

Keilig²,

Kosicik³

et al. 1978

Self Cite

The constant Ku of magnetic uniaxial anisotropy is measured in sputtered amorphous Gd–Co films by different methods. Considerable discrepancies are found between the results of static and of ferromagnetic resonance measurements, especially in the region of magnetic compensation. The reasons for the different results are probably inhomogeneous composition and microstructure of the films and slightly field‐dependent magnetic parameters of amorphous Gd–Co. To get more insight in the origin of Ku in amorphous Gd–Co, measurements in a broad temperature range are performed before and after annealing. The results show clearly two main contributions to Ku. Atomic short range order leads to positive Ku and disappears during annealing. Stresses in the films produce negative Ku at temperatures below the temperature during preparation and are not significantly influenced by annealing.

Hall hysteresis loops in the vicinity of compensation temperature in amorphous HoCo films

Ratajczak

Gościańska

1980

Studies of the anomalous Hall hysteresis loop in the vicinity of Tcomp are carried out to explain whether or not it is caused by the composition gradient across the thickness in amorphous flash evaporated HoCo films. Domain structure appear, when they are magnetized reversal, in the inner as well as in the outer loops. It rather shakes the correctness of Esho's model which is based on the existence of composition gradient in these films. However, regions of composition inhomogeneties which could explain the anomalous behaviour of the hysteresis loop near Tcomp are not observed.