Evidence of anomalous conventional and spontaneous exchange bias, high coercivity in Fe doped NiCr2O4 spinel

Comparative study on the magnetic properties of Fe-substituted Co2Sn1-xFexO4spinel oxides and its exchange bias effect

Herein, we report the Fe-substituted Co2Sn1-xFexO4(0 ⩽ x ⩽ 0.4) inverse spinel's oxide using the solid-state reaction method. X-ray reveals the single-phase cubic structure with space group Fd3m. With increasing Fe in Co2Sn1-xFexO4spinel oxide, the transition temperature rise. The ac susceptibility at different frequencies also confirms a spin-glassy state at lower temperatures. The strong exchange bias effect appears in the sample having Fe substitution (x= 0.2) under the presence of constant temperature ∼10 K. The high-temperature susceptibility of Curie-Wise fitting shows that the system changes from antiferromagnetic exchange (x< 0.2) to ferromagnetic exchange (x> 0.2).