TITLE

Room-temperature ferromagnetism in MgO nanocrystalline powders

AUTHOR(S)
Jifan Hu; Zhongli Zhang; Ming Zhao; Hongwei Qin; Minhua Jiang
PUB. DATE
November 2008
SOURCE
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p192503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
35514318

 

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