Antisite disorder driven spontaneous exchange bias effect in La2-xSrxCoMnO6 (0<x<1)

Abstract

Doping at the rare-earth site by divalent alkaline-earth ions in perovskite lattice has witnessed a variety of magnetic and electronic orders with spatially correlated charge, spin and orbital degrees of freedom. Here, we report an antisite disorder driven spontaneous exchange bias effect as a result of hole carrier (Sr2+) doping in La2-xSrxCoMnO6 (0 < x < 1) double perovskites. X-ray diffraction and Raman spectroscopy have evidenced an increase in disorder with the increase of Sr content up to x = 0.5 and thereby decreases from x = 0.5 to 1. X-ray absorption spectroscopy has revealed that only Co is present in mixed valent Co2+ and Co3+ states with Sr doping to compensate the charge neutrality. Magnetotransport is strongly correlated with the increase of antisite disorder. The antisite disorder at the B-site interrupts the long-range ferromagnetic order by introducing various magnetic interactions and instigates reentrant glassy dynamics, phase separation and canted type antiferromagnetic behavior with the decrease of temperature. This leads to novel magnetic microstructure with unidirectional anisotropy that causes spontaneous exchange bias effect that can be tuned with the amount of antisite disorder.

22 pages, 9 figs

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Cited by in corpus (11)

• The zero-field-cooled exchange bias effect in phase-segregated La${}_{2-x}$A${}_x$CoMnO${}_{6-\delta }$ (A = Ba, Ca, Sr; x = 0, 0.5)
• Influence of spin glass-like magnetic relaxation on the zero-field-cooled exchange bias effect
• Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6
• Probing the Griffiths like phase, unconventional dual glassy states, giant exchange bias effects and its correlation with its electronic structure in Pr2-xSrxCoMnO6
• Tuning the spontaneous exchange bias effect with Ba to Sr partial substitution in La${}_{1.5}$(Sr${}_{0.5-x}$Ba${}_x$)CoMnO${}_6$
• Griffiths phase and spontaneous exchange bias in La${}_{1.5}$Sr${}_{0.5}$CoMn${}_{0.5}$Fe${}_{0.5}$O${}_6$
• The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y${}_2$CoMnO${}_6$ 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
• Large spontaneous exchange bias in a weak ferromagnet Pb6Ni9(TeO6)5