Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method
<p>Abstract</p> <p>FePt nanoparticles with average size of 9 nm were synthesized using a diblock polymer micellar method combined with plasma treatment. To prevent from oxidation under ambient conditions, immediately after plasma treatment, the FePt nanoparticle arrays were in situ...
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Online Access: | http://dx.doi.org/10.1007/s11671-009-9433-4 |
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doaj-83b73ed1c79f4e898b35e6505b93dc282020-11-24T21:49:04ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2009-01-015116Magnetic Properties of FePt Nanoparticles Prepared by a Micellar MethodGao YZhang XWYin ZGQu SYou JBChen NF<p>Abstract</p> <p>FePt nanoparticles with average size of 9 nm were synthesized using a diblock polymer micellar method combined with plasma treatment. To prevent from oxidation under ambient conditions, immediately after plasma treatment, the FePt nanoparticle arrays were in situ transferred into the film-growth chamber where they were covered by an SiO<sub>2</sub> overlayer. A nearly complete transformation of <it>L</it>1<sub>0</sub> FePt was achieved for samples annealed at temperatures above 700 °C. The well control on the FePt stoichiometry and avoidance from surface oxidation largely enhanced the coercivity, and a value as high as 10 kOe was obtained in this study. An evaluation of magnetic interactions was made using the so-called isothermal remanence (IRM) and dc-demagnetization (DCD) remanence curves and Kelly–Henkel plots (Δ<it>M</it> measurement). The Δ<it>M</it> measurement reveals that the resultant FePt nanoparticles exhibit a rather weak interparticle dipolar coupling, and the absence of interparticle exchange interaction suggests no significant particle agglomeration occurred during the post-annealing. Additionally, a slight parallel magnetic anisotropy was also observed. The results indicate the micellar method has a high potential in preparing FePt nanoparticle arrays used for ultrahigh density recording media.</p> http://dx.doi.org/10.1007/s11671-009-9433-4FePt nanoparticlesReverse micellesSelf-assemblyInterparticle exchange couplingMagnetic recording |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Gao Y Zhang XW Yin ZG Qu S You JB Chen NF |
spellingShingle |
Gao Y Zhang XW Yin ZG Qu S You JB Chen NF Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method Nanoscale Research Letters FePt nanoparticles Reverse micelles Self-assembly Interparticle exchange coupling Magnetic recording |
author_facet |
Gao Y Zhang XW Yin ZG Qu S You JB Chen NF |
author_sort |
Gao Y |
title |
Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method |
title_short |
Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method |
title_full |
Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method |
title_fullStr |
Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method |
title_full_unstemmed |
Magnetic Properties of FePt Nanoparticles Prepared by a Micellar Method |
title_sort |
magnetic properties of fept nanoparticles prepared by a micellar method |
publisher |
SpringerOpen |
series |
Nanoscale Research Letters |
issn |
1931-7573 1556-276X |
publishDate |
2009-01-01 |
description |
<p>Abstract</p> <p>FePt nanoparticles with average size of 9 nm were synthesized using a diblock polymer micellar method combined with plasma treatment. To prevent from oxidation under ambient conditions, immediately after plasma treatment, the FePt nanoparticle arrays were in situ transferred into the film-growth chamber where they were covered by an SiO<sub>2</sub> overlayer. A nearly complete transformation of <it>L</it>1<sub>0</sub> FePt was achieved for samples annealed at temperatures above 700 °C. The well control on the FePt stoichiometry and avoidance from surface oxidation largely enhanced the coercivity, and a value as high as 10 kOe was obtained in this study. An evaluation of magnetic interactions was made using the so-called isothermal remanence (IRM) and dc-demagnetization (DCD) remanence curves and Kelly–Henkel plots (Δ<it>M</it> measurement). The Δ<it>M</it> measurement reveals that the resultant FePt nanoparticles exhibit a rather weak interparticle dipolar coupling, and the absence of interparticle exchange interaction suggests no significant particle agglomeration occurred during the post-annealing. Additionally, a slight parallel magnetic anisotropy was also observed. The results indicate the micellar method has a high potential in preparing FePt nanoparticle arrays used for ultrahigh density recording media.</p> |
topic |
FePt nanoparticles Reverse micelles Self-assembly Interparticle exchange coupling Magnetic recording |
url |
http://dx.doi.org/10.1007/s11671-009-9433-4 |
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