Giant magnetic susceptibility of gold nanorods detected by magnetic alignment.
Giant magnetic susceptibility of gold nanorods detected by magnetic alignment.
复制标题
通过磁对准检测金纳米棒的巨磁化率。
DOI：
10.1103/physrevlett.111.127202
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发表时间：
2013
影响因子：
8.6
通讯作者：
P. Christianen
中科院分区：
文献类型：
--
作者：
P. V. van Rhee;P. Zijlstra;T. Verhagen;J. Aarts;M. Katsnelson;J. Maan;M. Orrit;P. Christianen
我们已经确定了单晶Au纳米棒在溶液中的磁性，使用光学检测的磁对准技术。棒在磁体积磁化率（Δ x（V））方面表现出大的各向异性。Δ x（V）随着棒尺寸的减小和纵横比的增加而增加，并且对应于平均体积磁化率（x（V）），其相对于本体Au显著增强。这种高的χ（V）值通过SQUID磁力测定法证实，并且与温度无关（在5和300 K之间）。考虑到这种特殊的尺寸，形状和温度依赖性，我们推测增强的χ（V）是由于纳米棒内的介观电子轨迹引起的轨道磁性的结果。
We have determined the magnetic properties of single-crystalline Au nanorods in solution using an optically detected magnetic alignment technique. The rods exhibit a large anisotropy in the magnetic volume susceptibility (Δχ(V)). Δχ(V) increases with decreasing rod size and increasing aspect ratio and corresponds to an average volume susceptibility (χ(V)), which is drastically enhanced relative to bulk Au. This high value of χ(V) is confirmed by SQUID magnetometry and is temperature independent (between 5 and 300 K). Given this peculiar size, shape, and temperature dependence, we speculate that the enhanced χ(V) is the result of orbital magnetism due to mesoscopic electron trajectories within the nanorods.