Spontaneous formation of an exchange-spring composite via magnetic phase separation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ca</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>CoO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
S. El-KhatibDepartment of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USAShameek BoseDepartment of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USAChao HeDepartment of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USAJ. KuplicDepartment of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USAM. LaverDepartment of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USAJ. A. BorchersNIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USAQ. HuangNIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USAJ. W. LynnNIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USAJ. F. MitchellMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USAChris LeightonDepartment of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
2010lv
ABI
Abstract
We present a neutron-diffraction, small-angle scattering, and magnetometry study of the narrow bandwidth perovskite cobaltite ${\text{Pr}}_{1\ensuremath{-}x}{\text{Ca}}_{x}{\text{CoO}}_{3}$, 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.
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Cited by 30 references