Magnetic properties of Sb-doped FePt nanoparticles
Sb-doped FePt nanoparticles with an average diameter of 8.5 nm were prepared by thermal decomposition of platinum acetylacetonate, antimony acetate, and iron pentacarbonyl. Upon annealing to ~300°C for 30 min, nanoparticles with XSb=0.14 and 0.23 show Hc>500 mT, and...
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| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/85264 http://hdl.handle.net/10220/8959 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Sb-doped FePt nanoparticles with an average diameter of 8.5 nm were prepared by thermal
decomposition of platinum acetylacetonate, antimony acetate, and iron pentacarbonyl. Upon
annealing to ~300°C for 30 min, nanoparticles with XSb=0.14 and 0.23 show Hc>500 mT, and
L10 ordering parameter S values of ~0.83–0.87. Transmission electron microscopy of the annealed
assemblies shows no observable nanoparticle coalescence at 300°C. Low-temperature coercivity
measurements with a superconducting quantum interference device indicate the presence of
particles that exhibit superparamagnetism, probably due to the large particle size distribution or
inhomogeneity in Sb incorporation. Our results underscore the necessity to synthesize monodisperse
FePt nanoparticles with controlled composition to maximize ferromagnetic behavior. |
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