Magnetic Properties of FePt Nanoparticles Prepared by Sonoelectrodeposition

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 Fe 45 Pt 55 nanoparticles were ferromagnetic at room temperature. Upon annealing at 700 • C for 1 h under H 2 atmosphere, 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.

A Controllability Investigation of Magnetic Properties for FePt Alloy Nanocomposite Thin Films

“…However, most of the methods to prepare FePt exchange coupling materials involve chemical synthesis, which is expensive and cannot precisely control the proportion of the components. Moreover, the annealing process, which is required for the formation of L1 0 phase, will lead to undesired particle agglomeration, giving rise to clusters of individual particles [14,15,16]. Since pulse laser deposition (PLD) has the advantages of fast growth rate and easily adjustable process parameters, the prepared samples are free of impurities [17].…”