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Crespo del Arco, Patricia and García, M. A. and Fernández Pinel, E. and Multigner, M. and Alcántara, D. and De la Fuente, J. M. and Penadés, S. and Hernando Grande, Antonio (2006) Fe impurities weaken the ferromagnetic behavior in Au nanoparticles. Physical review letters, 97 (17). ISSN 0031-9007
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.97.177203
Abstract
In this Letter, we report on a crucial experiment showing that magnetic impurities reduce the ferromagnetic order temperature in thiol-capped Au glyconanoparticles (GNPs). The spontaneous magnetization of AuFe GNPs exhibits a fast decrease with temperature that contrasts with the almost constant value of the magnetization observed in Au NPs. Moreover, hysteresis disappears below 300 K. Both features indicate that Fe impurities reduce the high local anisotropy field responsible for the ferromagnetic behavior in Au GNPs. As a consequence, the amazing ferromagnetism in Au NPs should not be associated with the presence of magnetic impurities.
| Item Type: | Article |
|---|---|
| Additional Information: | © 2006 The American Physical Society. |
| Uncontrolled Keywords: | Gold; Glyconanoparticles; Molecules |
| Subjects: | Sciences > Physics > Materials Sciences > Physics > Solid state physics |
| ID Code: | 41792 |
| Deposited On: | 14 Mar 2017 11:56 |
| Last Modified: | 14 Mar 2017 11:56 |
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