Tuning the spontaneous exchange bias effect with Ba to Sr partial substitution in La${}_{1.5}$(Sr${}_{0.5-x}$Ba${}_x$)CoMnO${}_6$

Abstract

The spontaneous exchange bias (SEB) effect is a remarkable phenomenon recently observed in some reentrant spin-glass materials. Here we investigate the SEB in La${}_{1.5}$(Sr${}_{0.5-x}$Ba${}_x$)CoMnO${}_6$ double-perovskites, a system with multifarious magnetic phases for which a notable increase in the exchange bias field is observed for intermediate Sr/Ba concentrations. The Ba to Sr substitution leads to the enhancement of the crystal lattice, which is accompanied by the raise of both the effective magnetic moment (${\mu }_{eff}$) and the antiferromagnetic (AFM) transition temperature that is observed below the ferromagnetic ordering. Such increases are likely related to the increased fraction of Co${}^{3+}$ in the high spin configuration, leading to the enhancement of Co${}^{3+}$--O--Mn${}^{4+}$ AFM phase and to the reduction in the uncompensation of the AFM coupling between Co and Mn. The combined effect of the increased ${\mu }_{eff}$ and AFM phase plausible explains the changes in the SEB effect.

arXiv comment4 pages, 3 figures

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Cited by in corpus (7)

• The spontaneous exchange bias effect in La2-xCaxCoMnO6 series
• Essential aspects of the spontaneous exchange bias effect
• Coupling between Antiferromagnetic and Spin Glass Orders in the Quasi-One-Dimensional Iron Telluride TaFe${}_{1+x}$Te${}_3$ ($x$=0.25)
• Structural, electronic and magnetic properties of La${}_{1.5}$Ca${}_{0.5}$(Co${}_{0.5}$Fe${}_{0.5}$)IrO${}_6$ double perovskite
• Absence of zero-field-cooled exchange bias effect in single crystalline La2-xAxCoMnO6 (A = Ca, Sr) compounds
• Structural transitions and spontaneous exchange bias in La2-xBaxCoMnO6 series
• Tuning the spontaneous exchange bias effect in La1.5Sr0.5CoMnO6 with sintering temperature