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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Research Article| November 10 2008
Room-temperature ferromagnetism in MgO nanocrystalline powders
Jifan Hu, Zhongli Zhang, Ming Zhao, Hongwei Qin, Minhua Jiang; Room-temperature ferromagnetism in MgO nanocrystalline powders. Appl. Phys. Lett. 10 November 2008; 93 (19): 192503. https://doi.org/10.1063/1.3021085
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