Enhanced L10 phase transition in CoPt/Ag core/shell nanoparticles

We have prepared CoPt/Ag core/shell nanoparticles (NPs) by the seed-medium method and demonstrated that Ag shells perform a crucial role in the magnetic enhancement of CoPt NPs. The NPs were annealed under Ar+5%H2 atmosphere at different temperatures and the coercivities of both CoPt and CoPt/Ag NPs...

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Bibliographic Details
Published in:Materials letters 2012-11, Vol.86, p.142-145
Main Authors: Yu, L.N., Lu, L.Y., Xu, Z.D., Xu, X.G., Miao, J., Jiang, Y.
Format: Article
Language:English
Subjects:
annealing
Core/shell structure
Magnetic materials
Materials and alloys
Nanomaterials
nanoparticles
phase transition
temperature
X-ray diffraction
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Summary:We have prepared CoPt/Ag core/shell nanoparticles (NPs) by the seed-medium method and demonstrated that Ag shells perform a crucial role in the magnetic enhancement of CoPt NPs. The NPs were annealed under Ar+5%H2 atmosphere at different temperatures and the coercivities of both CoPt and CoPt/Ag NPs increase with the rise of annealing temperature. The room temperature coercivity of the CoPt/Ag NPs reaches 19kOe after annealing at 650°C, which is much higher than that of CoPt NPs (∼2880Oe). From XRD patterns, the (001) and (110) peaks of the CoPt/Ag NPs are stronger than those of the CoPt ones, indicating a more complete L10 phase transition induced by Ag shells. ► CoPt/Ag core/shell nanoparticles have been prepared. ► Room temperature coercivity of CoPt/Ag NPs is as high as 19KOe. ► A much complete L10 phase transition can be induced by Ag shells.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.07.048