Abstract
We propose an original route to prepare magnetic alloy nanoparticles with uniform size and shape by using nanosecond annealing under pulsed laser irradiation. As demonstrated here on CoPt nanoparticles, flash laser annealing gives an unprecedented opportunity to control the size and the shape of bimetallic nanoparticles without changing their composition. The mechanisms involved in the complete reshaping of the nanoparticle thin films are discussed and it is also shown that order-disorder phase transformations occur under laser irradiation. This technique is then very interesting for magnetic alloy nanoparticles studies and applications because it opens up a new way to fabricate size-controlled spherical nanoparticles with narrow size dispersion.
Highlights
Future high-density recording systems require 10 nm magnetic grains with a high magnetic anisotropy (Ku) to insure their thermal stability [1]
We propose an original route to prepare magnetic alloy nanoparticles with uniform size and shape by using nanosecond annealing under pulsed laser irradiation
The mechanisms involved in the complete reshaping of the nanoparticle thin films are discussed and it is shown that order-disorder phase transformations occur under laser irradiation
Summary
Address: 1Matériaux et Phénomènes Quantiques, UMR 7162, Bâtiment Condorcet, Case 7021, Université Paris 7 / CNRS, 75205 Paris Cedex 13, France, Phone : +33 1 57 27 69 83 and 2Laboratoire d’Etude des Microstructures – Unité mixte ONERA / CNRS, BP 72, 92322 Châtillon Cedex, France.
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