Surface phase separation in nanosized charge-ordered manganites

Abstract

Recent experiments showed that the robust charge-ordering in manganites can be weakened by reducing the grain size down to nanoscale. Weak ferromagnetism was evidenced in both nanoparticles and nanowires of charge-ordered manganites. To explain these observations, a phenomenological model based on surface phase separation is proposed. The relaxation of superexchange interaction on the surface layer allows formation of a ferromagnetic shell, whose thickness increases with decreasing grain size. Possible exchange bias and softening of the ferromagnetic transition in nanosized charge-ordered manganites are predicted.

4 pages, 3 figures

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• Magnetoelectricity coupled exchange bias in BaMnF${}_4$
• Direct experimental evidence of multiferroicity in a nanocrystalline Zener polaron ordered manganite
• Magnetocaloric effect and nature of magnetic transition in nanoscale Pr0.5Ca0.5MnO3