Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

Abstract

In this work we report the synthesis and structural, electronic and magnetic properties of La1.5Ca0.5CoMnO6 double-perovskite. This is a re-entrant spin cluster material which exhibits a non-negligible negative exchange bias effect when it is cooled in zero magnetic field from an unmagnetized state down to low temperature. X-ray powder diffraction, X-ray photoelectron spectroscopy and magnetometry results indicate mixed valence state at Co site, leading to competing magnetic phases and uncompensated spins at the magnetic interfaces. We compare the results for this Ca-doped material with those reported for the resemblant compound La1.5Sr0.5CoMnO6, and discuss the much smaller spontaneous exchange bias effect observed for the former in terms of its structural and magnetic particularities. For La1.5Ca0.5CoMnO6, when successive magnetization loops are carried, the spontaneous exchange bias field inverts its sign from negative to positive from the first to the second measurement. We discuss this behavior based on the disorder at the magnetic interfaces, related to the presence of a glassy phase. This compound also exhibits a large conventional exchange bias, for which there is no sign inversion of the exchange bias field for consecutive cycles.

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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
• 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${}_6$
• Griffiths phase and spontaneous exchange bias in La${}_{1.5}$Sr${}_{0.5}$CoMn${}_{0.5}$Fe${}_{0.5}$O${}_6$
• Essential aspects of the spontaneous exchange bias effect
• The spontaneous exchange bias effect in La2-xCaxCoMnO6 series
• The spontaneous exchange bias effect on La${}_{1.5}$Ba${}_{0.5}$CoMnO${}_6$
• Moderate Magnetic Field Induced Large Exchange Bias Effect in Ferrimagnetic 314-Sr3YCo4O10.5 Material
• 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