Magnetic order in Au nanoparticles with clean surface
Magnetic order in Au nanoparticles with clean surface
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具有清洁表面的金纳米粒子的磁序
DOI：
10.1016/j.jmmm.2015.05.072
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发表时间：
2015
影响因子：
2.7
通讯作者：
and Tetsuya Sato
中科院分区：
文献类型：
--
作者：
Ryuju Sato;Soichiro Ishikawa;Hiroyuki Sato;and Tetsuya Sato
通过气体蒸发法制备后保持在真空中的Au纳米颗粒即使在直径为1.7 nm时也显示出铁磁性。通过检测自发磁化的消失，在Au散装通过加热纳米粒子而不暴露于空气中制备的内在磁性检查。自发磁化强度的温度依赖性不是单调的，并且观察到Au纳米颗粒暴露于空气后磁化强度增加。磁性行为可以用类亚铁磁核壳结构来解释，壳层厚度为0.16±0.01 nm，磁矩为（1.5±0.1）×10−2μB/Au原子。
Au nanoparticles, which are kept in vacuum after the preparation by gas evaporation method, show ferromagnetism even in 1.7 nm in diameter. The intrinsic magnetism is examined by detecting the disappearance of spontaneous magnetization in Au bulk prepared by heating the nanoparticles without exposure to the air. The temperature dependence of spontaneous magnetization is not monotonic and the increase in magnetization is observed after Au nanoparticles are exposed to the air. The magnetic behavior can be interpreted by the ferrimagnetic-like core–shell structure with shell thickness of 0.16±0.01 nm and magnetic moment of (1.5±0.1)×10−2μB/Au atom, respectively.