Title :
Magnetic Hardening in Isolated FePt Nanoparticles
Author :
Rong, Chuan-Bing ; Nandwana, Vikas ; Poudyal, Narayan ; Chaubey, Girija S. ; Liu, J. Ping
Author_Institution :
Dept. of Phys., Univ. of Texas at Arlington, Arlington, TX
Abstract :
The effect of isolation on the phase transition temperature of FePt nanoparticles has been studied systematically by thermal, magnetic and structural characterizations and analyses. Isolated monodisperse L10 FePt nanoparticles embedded in carbon matrix were obtained by adding enough surfactants after chemical synthesis and by post-annealing during which the surfactant decomposed into carbon. It was found that the Al to L10 phase transition temperature is dependent sensitively on the amount of isolation medium. The transition temperature shift reaches 150-200 square from non-isolated particle assemblies to completely isolated particles.
Keywords :
annealing; hardening; iron alloys; magnetic particles; nanoparticles; nanotechnology; platinum alloys; solid-state phase transformations; surfactants; FePt; chemical synthesis; isolated nanoparticles; magnetic hardening; magnetic properties; phase transition temperature; post-annealing; surfactants; thermal properties; Annealing; Magnetic analysis; Magnetic anisotropy; Magnetic separation; Morphology; Nanoparticles; Perpendicular magnetic anisotropy; Superconducting magnets; Temperature; X-ray scattering;
Conference_Titel :
Nanotechnology, 2008. NANO '08. 8th IEEE Conference on
Conference_Location :
Arlington, TX
Print_ISBN :
978-1-4244-2103-9
Electronic_ISBN :
978-1-4244-2104-6
DOI :
10.1109/NANO.2008.184