Diameter dependence of ferromagnetic spin moment in Au nanocrystals
Diameter dependence of ferromagnetic spin moment in Au nanocrystals
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DOI：
10.1103/physrevb.69.174411
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发表时间：
2004-05-01
影响因子：
3.7
通讯作者：
Miyake, M
中科院分区：
文献类型：
--
作者：
Hori, H;Yamamoto, Y;Miyake, M
金纳米颗粒表现出铁磁自旋极化，并表现出磁化强度的直径依赖性。在磁化强度-直径曲线中，颗粒中每个Au原子的磁矩在直径约3nm处达到最大值。由于Au金属是一种典型的抗磁性材料，其铁磁极化机制被认为与过渡金属中观察到的铁磁性有很大不同。尺寸效应强烈表明在纳米尺度上存在一些自旋相关效应。所谓的“费米空穴效应”是自由电子气体系统中最可能出现的一种效应。使用该模型讨论了金纳米颗粒中的铁磁性。
Au nanoparticles exhibit ferromagnetic spin polarization and show diameter dependence in magnetization. The magnetic moment per Au atom in the particle attains its maximum value at a diameter of about 3 nm in the magnetization-diameter curve. Because Au metal is a typical diamagnetic material, its ferromagnetic polarization mechanism is thought to be quite different from the ferromagnetism observed in transition metals. The size effect strongly suggests the existence of some spin-correlation effect at the nanoscale. The so-called "Fermi hole effect" is the most probable one given in the free-electron gas system. Ferromagnetism in Au nanoparticles is discussed using this model.