Surface phase separation in nanosized charge-ordered manganites

Details Surface phase separation in nanosized charge-ordered manganites Surface phase separation in nanosized charge-ordered manganites

2006-12-15

arxiv.org/abs/cond-mat/0612391v2

Appl.Phys.Lett.90,082508(2007)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1063/1.2709911

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.

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