Spontaneous formation of an exchange-spring composite via magnetic phase separation in Pr1-xCaxCoO3

S. El-Khatib, Shameek Bose, C. He, J. Kuplic, M. Laver, J. A. Borchers, Q. Huang, J. W. Lynn, J. F. Mitchell, C. Leighton

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Abstract

We present a neutron-diffraction, small-angle scattering, and magnetometry study of the narrow bandwidth perovskite cobaltite Pr1-xCa xCoO3, demonstrating an unusual form of magnetoelectronic phase separation where long-range ordered ferromagnetism coexists spatially with short-range ferromagnetism. The two phases have very different coercivities and, remarkably, are strongly exchange coupled. The electronic phase separation thus leads to spontaneous formation of a hard-soft nanocomposite, exhibiting prototypical exchange-spring behavior in the absence of chemical interfaces.

Original languageEnglish (US)
Article number100411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number10
DOIs
StatePublished - Sep 22 2010

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