Temperature‐induced magnetic compensation and negative magnetization in a cluster spin glass Gd2Co0.5Mn1.5O6 system

Abstract

AbstractExperiments for orthorhombic double perovskite Gd2Co0.5Mn1.5O6 revealed intrinsic effects of magnetic compensation characterized by M(Tcomp) = 0 at Tcomp = 20 K and negative magnetization depicted by M(T) < 0 under positive magnetic fields, which were experimentally investigated by different protocols of direct current magnetization measurements. Compared to Gd2CoMnO6, the excessive ratio of Mn in Gd2Co0.5Mn1.5O6 promotes the antisite disorder and preferably generates magnetic clusters owing to the intrinsic inhomogeneity. The clusters exhibit spin glass (SG) properties as demonstrated by alternating current susceptibility and aging measurements. A possible physical mechanism for evolution of the spin configuration with temperature is proposed. The effects of magnetic compensation and negative magnetization are attributed to the negative exchange coupling among the abundant ferromagnetic clusters. The additional pinning force provided by the cluster SG is an essential factor to prevent the flipping of the spins from aligning with the applied magnetic field.