Griffiths phase and spontaneous exchange bias in La$_{1.5}$Sr$_{0.5}$CoMn$_{0.5}$Fe$_{0.5}$O$_{6}$

A. G. Silva; K. L. Salcedo RodrÃ­guez; C. P. Contreras Medrano; G. S. G. LourenÃ§o; M. Boldrin; E. Baggio-Saitovitch; L. BufaiÃ§al

doi:10.1088/1361-648X/abc595

paper

Griffiths phase and spontaneous exchange bias in La $_{1.5}$ Sr $_{0.5}$ CoMn $_{0.5}$ Fe $_{0.5}$ O $_{6}$

arXiv:2010.11110 · doi:10.1088/1361-648X/abc595

Abstract

La $_{1.5}$ Sr $_{0.5}$ CoMn $_{0.5}$ Fe $_{0.5}$ O $_{6}$ (LSCMFO) compound was prepared by solid state reaction and its structural, electronic and magnetic properties were investigated. The material forms in rhombohedral $R 3 ˉ c$ structure, and the presence of distinct magnetic interactions leads to the formation of a Griffiths phase above its FM transition temperature (150 K), possibly related to the nucleation of small short-ranged ferromagnetic clusters. At low temperatures, a spin glass-like phase emerges and the system exhibits both the conventional and the spontaneous exchange bias (EB) effects. These results resemble those reported for La $_{1.5}$ Sr $_{0.5}$ CoMnO $_{6}$ but are discrepant to those found when Fe partially substitutes Co in La $_{1.5}$ Sr $_{0.5}$ (Co $_{1 - x}$ Fe $_{x}$ )MnO $_{6}$ , for which the EB effect is observed in a much broader temperature range. The unidirectional anisotropy observed for LSCMFO is discussed and compared with those of resembling double-perovskite compounds, being plausibly explained in terms of its structural and electronic properties.

13 pages, 7 figures

Griffiths phase and spontaneous exchange bias in La1.5​Sr0.5​CoMn0.5​Fe0.5​O6​

Abstract

Griffiths phase and spontaneous exchange bias in La $_{1.5}$ Sr $_{0.5}$ CoMn $_{0.5}$ Fe $_{0.5}$ O $_{6}$