کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1524638 | 995340 | 2011 | 5 صفحه PDF | دانلود رایگان |
The FePt/Ag core-shell nanoparticles with different Ag shell thickness have been fabricated using a seed mediated technique. The core-shell nanoparticles are annealed at temperatures ranging from 350 to 600 °C for 30 min in vacuum. The magnetic measurement demonstrates that the FePt/Ag core-shell nanoparticles show a better chemical ordering tendency with a magnetic hardening temperature of 400–450 °C, which is almost 100 °C lower than that of pure FePt nanoparticles. Negative peaks on the δM curves of the annealed FePt/Ag core-shell nanoparticles demonstrate that the predominant interparticle interactions are dipolar type rather than exchange coupling one. Besides, the FePt/Ag core-shell nanoparticles show both sensitive plasmonic and superparamagnetic properties. The present results indicate that our composite nanoparticles are very promising from the viewpoint of the optoelectronics and biomedical applications.
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► The core-shell structured FePt/Ag nanoparticles show a lower ordering temperature.
► FePt nanoparticles can obtain larger coercivities by coating Ag shells.
► Ag shells help to reduce the dipolar-type interaction between the annealed particles.
Journal: Materials Chemistry and Physics - Volume 129, Issue 3, 3 October 2011, Pages 995–999