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Second-order-like cluster-monomer transition within magnetic fluids and its impact upon the magnetic susceptibility.
| Content Provider | Europe PMC |
|---|---|
| Author | Zhong, Jing Xiang, Qing Massa, Letícia O Qu, Fanyao Morais, Paulo C Liu, Wenzhong |
| Copyright Year | 2012 |
| Abstract | The low-field (below 5 Oe) ac and dc magnetic response of a magnetic fluid [MF] sample in the range of 305 to 360 K and 410 to 455 K was experimentally and theoretically investigated. We found a systematic deviation of Curie's law, which predicts a linear temperature dependence of inverse initial susceptibility in the range of our investigation. This finding, as we hypothesized, is due to the onset of a second-order-like cluster-to-monomer transition with a critical exponent which is equal to 0.50. The susceptibility data were well fitted by a modified Langevin function, in which cluster dissociation into monomers, at the critical temperature [T*], was included. In the ac experiments, we found that T* was reducing from 381.8 to 380.4 K as the frequency of the applied field increases from 123 to 173 Hz. In addition, our ac experiments confirm that only monomers respond for the magnetic behavior of the MF sample above T*. Furthermore, our Monte Carlo simulation and analytical results support the hypothesis of a thermal-assisted dissociation of chain-like structures.PACS: 75.75.-C; 75.30.Kz; 75.30.Cr. |
| ISSN | 19317573 |
| Journal | Nanoscale Research Letters |
| Volume Number | 7 |
| PubMed Central reference number | PMC3310723 |
| Issue Number | 1 |
| PubMed reference number | 22390618 |
| e-ISSN | 1556276X |
| DOI | 10.1186/1556-276x-7-167 |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2012-03-05 |
| Access Restriction | Open |
| Rights License | This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright ©2012 Zhong et al; licensee Springer. |
| Subject Keyword | magnetic fluid inverse initial susceptibility cluster disruption critical temperature Langevin function |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Condensed Matter Physics Materials Science |
