Saturation velocity phenomena in implanted garnet films

摘要

The domain wall velocity of ion‐implanted garnet films is measured on expanding stripe domains observed—using a laser‐flash optical microscope, for wide drive field and temperature range. Comparison of measured and calculated velocities shows the insufficiency of present theories. A simple model is suggested for describing the saturation velocity phenomena in implanted garnet films. This model shows the wall structure distortion at the effective films surfaces to be approximated by a transient Bloch line zone. The average static azimuthal angle is assumed to be ψ¯0=π2Λ0/D in good agreement with the experimentally obtained ψ¯0=11.8 Λ0/D, where D is the effective film thickness and Λ0 is the Bloch line width parameter. The calculated saturation velocities agree surprisingly well with the experimental results for wide thickness and temperature range.