From magnetic cluster glass state to giant vertical magnetization shift induced by ferromagnetic cluster growth in SrFe0.25Co0.75O2.63

A charge ordering phenomenon within the crystallographic sites as following Sr4(Fe0.143+Co0.363+)48h(Fe0.114+Co0.144+Co0.253+)48fO10.52 was previously reported thanks to neutron diffraction coupled with Mossbauer spectroscopy studies. Such distribution supports a natural magnetic layered structure combining both in-plane ferromagnetic super-exchange interactions mainly on octahedron “8 f” sub-layer alternating and antiferromagnetic h” containing tetrahedral five-fold symmetry polyhedra (i.e. squared based pyramid and/or trigonal bipyramid). Because of interfacial between two types layers, we report detailed study intriguing properties. AC susceptibility shows frequency dependent peak suggesting cooperative character due inter-cluster resulting in cluster glass state. When temperature decreases applied field increase, clusters growth is promoted results large vertical hysteretic shift Field Cooled magnetization isotherm relation minor loop.