Determining magnetic nanoparticle size distributions from thermomagnetic measurements
| Autor: | Robert S. DiPietro, Steven Bennett, H. G. Johnson, Laura H. Lewis, Don Heiman, Thomas Nummy |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) Condensed matter physics Analytical technique FOS: Physical sciences Nanoparticle 02 engineering and technology Thermomagnetic convection 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter::Materials Science Magnetization Magnetic anisotropy Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Magnetic nanoparticles 010306 general physics 0210 nano-technology Anisotropy Superparamagnetism |
| Zdroj: | Applied Physics Letters. 96:222506 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.3441411 |
| Popis: | Thermomagnetic measurements are used to obtain the size distribution and anisotropy of magnetic nanoparticles. An analytical transformation method is described which utilizes temperature-dependent zero-field cooling (ZFC) magnetization data to provide a quantitative measurement of the average diameter and relative abundance of superparamagnetic nanoparticles. Applying this method to self-assembled MnAs nanoparticles in MnAs-GaAs composite films reveals a log-normal size distribution and reduced anisotropy for nanoparticles compared to bulk materials. This analytical technique holds promise for rapid assessment of the size distribution of an ensemble of superparamagnetic nanoparticles. Comment: Correction Appl. Phys. Lett. 98, 216103 (2011) |
| Databáze: | OpenAIRE |
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