A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials
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...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2013
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| Online Access: | http://psasir.upm.edu.my/id/eprint/52282/1/A%20simple%20method%20for%20measuring%20intrinsic%20blocking%20temperature%20in%20superparamagnetic%20nanomaterials.pdf |
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| author | Bahmanrokh, Ghazaleh Hashim, Mansor Ismail, Ismayadi Soltani, Nayereh Vaziri, Parisa Shafie, Mohd Shamsul Ezzad Navasery, Manizheh |
| author_facet | Bahmanrokh, Ghazaleh Hashim, Mansor Ismail, Ismayadi Soltani, Nayereh Vaziri, Parisa Shafie, Mohd Shamsul Ezzad Navasery, Manizheh |
| author_sort | Bahmanrokh, Ghazaleh |
| collection | UPM |
| description | 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. |
| first_indexed | 2024-03-06T09:15:27Z |
| format | Article |
| id | upm.eprints-52282 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:15:27Z |
| publishDate | 2013 |
| publisher | Springer |
| record_format | dspace |
| spelling | upm.eprints-522822017-06-05T05:39:28Z http://psasir.upm.edu.my/id/eprint/52282/ A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials Bahmanrokh, Ghazaleh Hashim, Mansor Ismail, Ismayadi Soltani, Nayereh Vaziri, Parisa Shafie, Mohd Shamsul Ezzad Navasery, Manizheh 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. Springer 2013 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/52282/1/A%20simple%20method%20for%20measuring%20intrinsic%20blocking%20temperature%20in%20superparamagnetic%20nanomaterials.pdf Bahmanrokh, Ghazaleh and Hashim, Mansor and Ismail, Ismayadi and Soltani, Nayereh and Vaziri, Parisa and Shafie, Mohd Shamsul Ezzad and Navasery, Manizheh (2013) A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials. Journal of Superconductivity and Novel Magnetism, 26 (2). pp. 407-414. ISSN 1557-1939; ESSN: 1557-1947 http://rd.springer.com/article/10.1007/s10948-012-1742-7 10.1007/s10948-012-1742-7 |
| spellingShingle | Bahmanrokh, Ghazaleh Hashim, Mansor Ismail, Ismayadi Soltani, Nayereh Vaziri, Parisa Shafie, Mohd Shamsul Ezzad Navasery, Manizheh A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| title | A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| title_full | A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| title_fullStr | A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| title_full_unstemmed | A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| title_short | A simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| title_sort | simple method for measuring intrinsic blocking temperature in superparamagnetic nanomaterials |
| url | http://psasir.upm.edu.my/id/eprint/52282/1/A%20simple%20method%20for%20measuring%20intrinsic%20blocking%20temperature%20in%20superparamagnetic%20nanomaterials.pdf |
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