4.6 Article

Magnetism in polycrystalline cobalt-substituted zinc oxide

Journal

PHYSICAL REVIEW B
Volume 68, Issue 20, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.68.205202

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We present results of the preparation (by precursor decomposition), characterization (with x-ray diffraction, transmission electron microscopy, and dc magnetization measurements), and detailed computation (using density functional theory) of polycrystalline ZnO with up to 15% substitution of the zinc sites by divalent cobalt. The experimental results indicate the dominant magnetic interaction in well-characterized stoichiometric phases Zn1-xCoxO, x=0.05, 0.10, 0.15, is nearest-neighbor antiferromagnetic. Our computations suggest robust ferromagnetism will only occur in the presence of additional hole doping.

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