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Title
Surface phase separation in nanosized charge-ordered manganites
Article in journal
Authors
S. Dong, Feng Gao, Z. Q. Wang, J. -M. Liu, Z. F. Ren
Publication Year
2007
Source
Applied Physics Letters, 2007, (90)8, 082508
Link to Source (DOI)
10.1063/1.2709911
Abstract
<p>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. (c) 2007 American Institute of Physics.</p>