Room-temperature ferromagnetism in MgO nanocrystalline powders

被引：177
|
作者：
Hu, Jifan [1 ]
Zhang, Zhongli [1 ]
Zhao, Ming [1 ]
Qin, Hongwei [1 ]
Jiang, Minhua [1 ]
机构：
[1] Shandong Univ, Sch Phys & Microelect, Natl Key Lab Crystal Mat, Jinan 250100, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 19期
基金：
中国国家自然科学基金;
关键词：
annealing; diamagnetism; ferromagnetic materials; magnesium compounds; magnetic moments; nanoparticles; percolation; sol-gel processing; vacancies (crystal);
D O I：
10.1063/1.3021085
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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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页数：3
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