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Phase Transformation in Silica-Coated FePt Nanoparticles

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2 Author(s)
Colak, L. ; Dept. of Phys. & Astron., Univ. of Delaware, Newark, DE, USA ; Hadjipanayis, George C.

Chemically synthesized FePt nanoparticles (NPs), with an average size of 5.8 nm, were coated with silica (SiO2) shells. The thickness of the silica shell could be controlled between 7.5-25 nm. A modified heating profile has been adopted with which silica shell cracking at high temperatures (1000degC) could be prevented. Even with prolonged heating for 24 h at 800degC, no sintering of the particles is observed. Low temperature (7 K) and room temperature magnetization scans show low coercivity values which are possibly due to a compositional distribution among the individual NPs.

Published in:

Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 10 )

Date of Publication:

Oct. 2009

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