Crystal size and magnetic field effects in Co 3 O 4 antiferromagnetic nanocrystals
Crystal size and magnetic field effects in Co 3 O 4 antiferromagnetic nanocrystals
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DOI：
10.1103/physrevb.79.144411
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发表时间：
2009-04
影响因子：
3.7
通讯作者：
T. Mousavand;T. Naka;Koichi Sato;S. Ohara;M. Umetsu;S. Takami;T. Nakane;A. Matsushita;T. Adschiri
中科院分区：
文献类型：
--
作者：
T. Mousavand;T. Naka;Koichi Sato;S. Ohara;M. Umetsu;S. Takami;T. Nakane;A. Matsushita;T. Adschiri
我们报道了平均直径为10的尖晶石纳米晶体在高达50克的磁场下的磁性。纳米颗粒被控制成立方形状。在体积较小的纳米晶体样品中，自发磁矩在体积样品的nsamel点以下急剧增加，而与体积样品相似，体积较大的纳米晶体样品在周围表现出最大的磁化强度。在较低的磁场下，磁化过程中出现了类似自旋玻璃的行为，而在较高的磁场下，这种行为消失了。
We report magnetism of spinelnanocrystals with average diameters ofandunder magnetic fields up to 50 kOe. The nanoparticles were controlled to be cubic in shape. In the smaller nanocrystal sample, a spontaneous magnetic moment increased steeply below the Néel point,of the bulk sample, whereas similar to bulk samples the larger crystal sampleexhibited a maximum in magnetization around. A spin-glass-like behavior in magnetization was observed atat lower magnetic fields, whereas above, this behavior disappeared.