Intrinsic magnetic moments of gold nanoparticles
Intrinsic magnetic moments of gold nanoparticles
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金纳米粒子的固有磁矩
DOI：
10.1103/physrevb.83.174446
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Wen
中科院分区：
文献类型：
--
作者：
Chi;Chun;S. Karna;Chin;D. Hsu;C. W. Wang;Wen
在这项研究中，开发的内禀磁矩在4 nm裸面心立方Au纳米粒子进行了研究。磁化曲线揭示了朗之万磁场分布，反映了自发磁矩的存在。中子衍射测量检测铁磁矩。在5 K时，晶体[111]方向上的磁衍射图与一个矩为B = 0.14 μ的点一致。静磁粒子间的相互作用削弱了局域磁矩，但提高了传导电子密度。这些行为可以通过考虑由有限尺寸效应触发的5d和6s电子带的合并和由粒子间相互作用引起的带混合的提升来理解。
In this study the intrinsic magnetic moments developed in 4 nm bare fcc Au nanoparticles were investigated. The magnetization curves reveal a Langevin magnetic field profile, reflecting the existence of spontaneous magnetic moments. Neutron diffraction measurements detect a ferromagnetic moment. The magnetic diffraction patterns are consistent with a moment of 〈μZ〉 = 0.14 μB points in the crystallographic [111] direction at 5 K. Magnetostatic interparticle interactions weaken the localized magnetic moments but enhance the conduction electron density. These behaviors can be understood by considering the merging of the 5d and 6s electron bands triggered by finite-size effects and the lifting of band mixture by interparticle interactions.