|
|||||
|
|
Magnetic circular dichroism and the nature of ferromagnetism in colloidal gold nanoparticles |
|
| Authors: | A. E. Sokolov S. G. Ovchinnikov V. N. Zabluda A. M. Kal’sin Ya. V. Zubavichus |
| Affiliation: | 1150. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia 2150. Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660041, Russia 3150. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991, Russia 4150. Kurchatov Centre of Synchrotron Radiation and Nanotechnologies, National Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia |
| Abstract: | The spectra of optical absorption and of magnetic circular dichroism (MCD) have been measured in the 350–1150 nm wavelength range for a set of colloidal solutions containing Au nanoparticles with the average size of 6 nm having thiolate coatings with different degrees of chirality. The form of absorption and MCD spectra suggests the dipole character of interband transitions involving the 5d-6(sp) orbitals. The absence (within the experimental error) of the dependence of the MCD spectra on the coating type rules out the hypothesis on the orbital nature of the observed magnetism. We argue that the spin polarization plays the dominant role in the magnetism of gold nanoparticles with a thiolate coating. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |