The spontaneous exchange bias effect in La2-xCaxCoMnO6 series

Abstract

Structural, electronic and magnetic properties of polycrystalline La2-xCaxCoMnO6 (0 $\le$ x $\le$ 0.75) compounds are investigated by x-ray diffraction and magnetometry. All the samples have an orthorhombic structure and show a slight decrease in the unit cell with Ca-doping. Temperature-dependent magnetization measurements reveal a complex magnetic behavior with two ferromagnetic transitions. These transitions are ascribed to Co2+--Mn4+ and Co3+--Mn3+ couplings and suggest the presence of additional antiferromagnetic couplings in these disordered compounds. Field-dependent magnetization curves, measured after cooling the samples in a zero external magnetic field, reveal the spontaneous exchange bias (SEB) effect for the Ca-doped samples. The strengthening of the uncompensated magnetic coupling at the interfaces, caused by the increased antiferromagnetic phase, explains the increase of SEB with increasing the Ca-content.

16 pages, 4 figures

References in corpus (4)

• Large zero-field cooled exchange-bias in bulk Mn2PtGa
• A phenomenological model for the spontaneous exchange bias effect
• Tuning the spontaneous exchange bias effect with Ba to Sr partial substitution in La${}_{1.5}$(Sr${}_{0.5-x}$Ba${}_x$)CoMnO${}_6$
• The effect of structural and magnetic disorder on the 3$d$-5$d$ exchange interactions of La${}_{2-x}$Ca${}_x$CoIrO${}_6$

Cited by in corpus (3)

• Essential aspects of the spontaneous exchange bias effect
• Structural transitions and spontaneous exchange bias in La2-xBaxCoMnO6 series
• Tuning the spontaneous exchange bias effect in La1.5Sr0.5CoMnO6 with sintering temperature