Magnetic behavior of layered perovskite Sr2CoO4 thin film

Abstract

We have studied the magnetic properties of Sr2CoO4 (SCO) thin film. Magnetic hysteresis loops of the film divulge two-phase-like magnetic behavior consisting of hard and soft magnetic phases. Temperature dependent magnetization measurements and time evolution of thermo-remanent magnetization relaxation indicate the possibility of spin-glass dynamics in SCO. The Arrott plots (M2 vs. H/M) exhibit the convex behavior, while the M4 vs. H/M plots show the linear relation near Curie temperature signifying itinerant ferromagnetism in the material, consistent with the calculated Rhodes-Wohlfarth ratio for the film. It is suggested that SCO has electrons with localized character as well as itinerant character.