Study of magnetization processes using higher harmonic ac-susceptibility

phys. stat. sol. (b) 245, 1661 (2008)

S. Prüfer and M. Ziese


The ac-susceptibility of a La0.7Sr0.3MnO3 epitaxial film was measured up to the 11th harmonic as a function of ac-field amplitude, superimposed dc-field and temperature. The experimental data reflect the magnetization hysteresis-loop shape in a very precise and detailed way. This is further elucidated by numerical simulations of the ac-susceptibility within a Preisach model with Gaussian distribution function. Using parameters from magnetization measurements the simulated ac-susceptibility curves were found to be in good agreement with the experimental results. This shows that measurements of higher harmonic susceptibilities are a powerful tool for the precise study of magnetization processes.