Self-assembled Co3(BO3)2/surfactant nanostructured multilayers
Self-assembled Co3(BO3)2/surfactant nanostructured multilayers
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DOI：
10.1088/0953-8984/13/18/301
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发表时间：
2001-05
期刊：
影响因子：
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通讯作者：
Xieqiu Zhang;G. Gu;Houjin Huang;Shihe Yang;Yuwei Du
中科院分区：
文献类型：
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作者：
Xieqiu Zhang;G. Gu;Houjin Huang;Shihe Yang;Yuwei Du
Co3(BO3)2/表面活性剂复合材料是通过水性钴阳离子与表面活性剂一起受控沉淀来制备的。通过X射线衍射测定，该复合材料显示出层状结构，其中厚度约6埃的Co3(BO3)2层与表面活性剂双层交替。零场冷却（ZFC）和场冷却（FC）过程中测量的温度相关磁化强度以及不同频率下测量的交流磁化率表明，在低温（<6 K）下存在冻结温度，并且温度与频率的关系较弱。在 2 K 时观察到热剩磁 (TRM) 和等温剩磁 (IRM) 之间存在明显差异。所有实验观察结果表明多层膜本质上是自旋玻璃。
Co3(BO3)2/surfactant composites have been prepared by the controlled precipitation of aqueous cobalt cations together with surfactant. The composite shows a layered structure as determined by x-ray diffraction, in which the Co3(BO3)2 layers of about 6 A in thickness are in alternation with surfactant bilayers. The temperature-dependent magnetization measured in the zero-field-cooled (ZFC) and field-cooled (FC) processes and the AC-magnetic susceptibility measured at different frequencies indicate that there is a freezing temperature at low temperature (<6 K) and the temperature is weakly frequency dependent. A clear difference between thermal remanent magnetization (TRM) and isothermal remanent magnetization (IRM) was observed at 2 K. All the experimental observations suggest that the multilayers are spinglass in nature.