Abstract
Sonoelectrodeposition is a useful technique to make metallic nanoparticles, using ultrasound during electrodeposition to remove nanoparticles as they grow on the cathode surface. This paper reports some structural and magnetic properties of FePt nanoparticles prepared by this method. The as-prepared Fe45Pt55nanoparticles were ferromagnetic at room temperature. Upon annealing at 700°C for 1 h under H2atmosphere, the saturation magnetization and the coercivity of the nanoparticles were improved significantly. The annealed nanoparticles showed a high coercivity of 13.5 kOe at 2 K and of 9 kOe at room temperature. Sonoelectrodeposition is a promising technique to make large quantity of FePt nanoparticles.
Highlights
The ordered face-centered tetragonal L10 FePt materials are normally obtained from the disordered face-centered cubic materials via the order-disorder transition
Electrodeposition is a promising way to obtain FePt thin films because it is less expensive than physical methods, less complicated than chemical methods
We report the use of the sonoelectrochemical method for the preparation of FePt nanoparticles
Summary
The ordered face-centered tetragonal (fct) L10 FePt materials are normally obtained from the disordered face-centered cubic (fcc) materials via the order-disorder transition. Electrodeposition is a promising way to obtain FePt thin films because it is less expensive than physical methods, less complicated than chemical methods. By this technique, it is difficult to get nanoparticles with large quantity. Sonoelectrochemistry was developed to make nanoparticles [12] It combined the advantages of sonochemistry and electrodeposition. Sonoelectrochemistry has the potential benefit of combining sonochemistry with electrochemistry. Some of these beneficial effects include acceleration of mass transport, cleaning and degassing of the electrode surface, and an increased reaction rate [14]. CoPt nanoparticles encapsulated in carbon cages prepared by sonoelectrodeposition have been reported by Luong et al [15]
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