Citation
Abstract
Temperature-dependent magnetic flux density (B) data, clearly exhibiting a transition temperature called intrinsic blocking temperature for some metallic samples in zero field cooled-warmed (ZFC-W) curves without employing an external magnetic field, has been obtained by a simple method. The reasons of the increase and decrease in the measured B-field at low temperature in zero magnetic-field were discussed. Co, CoPt3 and Co/Au, CoPt 3/Au core-shell nanoparticles, prepared by the reverse-micelle microemulsion method, were used as test materials. The blocking temperature was measured at a cusp of the measured magnetic field, B (produced by the sample), versus the temperature curve during warming up of the sample from a very low temperature (≤15 K) to room temperature. All the samples showed a blocking temperature at 45, 50, 40, and 42 K, respectively, for Co, CoPt3, Co/Au, and CoPt3/Au nanoparticles. A completely intrinsic behavior of the sample's magnetic moment was revealed by our method since no applied external field was used, yielding a truly spontaneous magnetization behavior.
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Official URL or Download Paper: http://rd.springer.com/article/10.1007/s10948-012-...
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Additional Metadata
| Item Type: | Article |
|---|---|
| Divisions: | Faculty of Science Institute of Advanced Technology |
| DOI Number: | https://doi.org/10.1007/s10948-012-1742-7 |
| Publisher: | Springer |
| Keywords: | Anisotropy energy; Intrinsic blocking temperature; Magnetic flux density; Magnetic moment; Superparamagnetism; Zero field cooled-warmed |
| Depositing User: | Nabilah Mustapa |
| Date Deposited: | 05 Jun 2017 05:39 |
| Last Modified: | 05 Jun 2017 05:39 |
| Altmetrics: | http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1007/s10948-012-1742-7 |
| URI: | http://psasir.upm.edu.my/id/eprint/52282 |
| Statistic Details: | View Download Statistic |
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