Determination of the blocking temperature of magnetic nanoparticles : The good, the bad, and the ugly
A numerically solved two-level Stoner-Wohlfarth model with thermal agitation is used to simulate Zero Field Cooling (ZFC)–Field Cooling (FC) curves of monosize and polysize samples and to determine the best method for obtaining a representative blocking temperature T<sub>B</sub> value of...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/124066 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124066 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Exactas Física Stoner-Wohlfarth model Magnetic nanoparticles |
| Sumario: | A numerically solved two-level Stoner-Wohlfarth model with thermal agitation is used to simulate Zero Field Cooling (ZFC)–Field Cooling (FC) curves of monosize and polysize samples and to determine the best method for obtaining a representative blocking temperature T<sub>B</sub> value of polysize samples. The results confirm a technique based on the T derivative of the difference between ZFC and FC curves proposed by Micha et al. (the good) and demonstrate its relation with two alternative methods: the ZFC maximum (the bad) and the inflection point (the ugly). The derivative method is then applied to experimental data, obtaining the T<sub>B</sub> distribution of a polysize Fe<sub>3</sub>O<sub>4</sub> nanoparticle sample suspended in hexane with an excellent agreement with TEM characterization. |
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