Ferromagnetic-like behavior of ultrafine NiO nanocrystallites

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• 作者：Bi ; Hong ; Li ; Shandong ; Zhang ; Yuchuan ; Du ; Youwei
• 关键词：61.46.+w ; 61.72.&minus ; y ; 75.50.Ee ; Nanoscale materials ; Lattice distortion ; Antiferromagnetics
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2004
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：June, 2004
• 卷：277
• 期：3
• 页码：363-367
• 文件大小：332 K

摘要

Ultrafine NiO nanocrystallites (NCs) with grain size of 5nm have been synthesized by vacuum thermolysis method. These NCs exhibit a ferromagnetic-like behavior, and a large coercivity of 327.14kA/m exists together with a large exchange bias field of 148.48kA/m at 4.2K. A large net magnetization of 205.72μ_B per particle is evaluated for the 5nm NCs. The ferromagnetic-like magnetic properties are attributed to the combined effects of missing bonds and the lattice distortion.