Tuning the spontaneous exchange bias effect with Ba to Sr partial substitution in La1.5(Sr0.5−xBax)CoMnO

Belluz, Marlon Boldrin; Silva, A. G.; Coutrim, Leandro Tolentino; Jesus, Jonathas Rafael de; Oliveira, Calazans Barbosa Marques Macchiutti de; Bittar, Eduardo Matzenbacher; Bufaiçal, Leandro Felix de Sousa

Tuning the spontaneous exchange bias effect with Ba to Sr partial substitution in La1.5(Sr0.5−xBax)CoMnO

Data

2020

Autores

Belluz, Marlon Boldrin

Silva, A. G.

Coutrim, Leandro Tolentino

Jesus, Jonathas Rafael de

Oliveira, Calazans Barbosa Marques Macchiutti de

Bittar, Eduardo Matzenbacher

Bufaiçal, Leandro Felix de Sousa

Resumo

The spontaneous exchange bias (SEB) effect is a remarkable phenomenon recently observed in some reentrant spin-glass materials. Here, we investigate the SEB in La1.5(Sr0.5−xBax)CoMnO6 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 increase in both the effective magnetic moment (μeff) and the antiferromagnetic (AFM) transition temperature that is observed below the ferromagnetic ordering. Such an increase is likely related to the increased fraction of Co3+ in the high spin configuration, leading to the enhancement of the Co3+–O–Mn4+ AFM phase and the reduction in the uncompensation of the AFM coupling between Co and Mn. The combined effect of the increased μeff and AFM phase plausibly explains the changes in the SEB effect.

Citação

BOLDRIN, M. et al. Tuning the spontaneous exchange bias effect with Ba to Sr partial substitution in La1.5(Sr0.5−xBax)CoMnO. Applied Physics Letters, College Park, v. 117, e212402, 2020. DOI: 10.1063/5.0028663. Disponível em: https://pubs.aip.org/aip/apl/article/117/21/212402/38879/Tuning-the-spontaneous-exchange-bias-effect-with. Acesso em: 16 fev. 2024.