Applied Physics Letters · 2008 · 199 citations · 9 references
Materials ScienceMagnetismFerromagnetismMaterials EngineeringSpintronicsMgo Nanocrystalline PowdersMagnetic PercolationEngineeringMagnetoresistanceRoom-temperature FerromagnetismApplied PhysicsMagnetic ResonanceMagnesium-based CompositeMagnetic MaterialMgo BulkFerrofluidMicrostructure
MgO nanocrystalline powders prepared by sol-gel method present room-temperature ferromagnetism, whereas MgO bulk exhibits diamagnetism. The vacuum annealing of MgO nanocrystalline powders reduces ferromagnetism. The observed room-temperature ferromagnetism in MgO nanocrystalline powders possibly originates from Mg vacancies at/near the surfaces of nanograins. Mg vacancies can induce local magnetic moments. Large concentrations of Mg vacancies at the surfaces of nanograins possibly establish magnetic percolation.
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Unexpected magnetism in a dielectric oxide
M. Venkatesan, C. B. Fitzgerald, J. M. D. Coey · Nature · 2004 · 1.2K citations · Full text
Dana A. Schwartz, Nick S. Norberg, Quyen P. Nguyen et al. · Journal of the American Chemical Society · 2003 · 641 citations
Magnetic Properties, Engineering, Colloidal Nanocrystals +18