The investigation of linear relationship between domain wall creep parameters in Co/Pt multilayers

Abstract

In this work, we investigate the linear relationship between domain wall creep parameters, and evaluate the effect of material parameters on magnetic domain wall creep in a series of Pt/Co/Pt multilayers with perpendicular magnetic anisotropy. The results for the samples with different magnetic layer thicknesses verify the linear relationship between the domain wall creep parameters, which is because both of the domain wall creep parameters are proportional to the Co layer thickness. With the assistance of surface acoustic waves, the domain wall creep parameters also follow the linear relationship, by which the relationship between the anisotropy energy density K and local pinning strength fpin is obtained as fpin∝K18. The above linear relationship does not exist in annealed samples because annealing breaks the relationship between the local pinning strength and material parameters.