Title :
XPS study of thermal effects on FePt and FePtAg nanoparticles
Author :
Song, Tao ; Zhou, Tiejun ; Chen, Chilong ; Gong, Hao
Author_Institution :
Data Storage Inst., Singapore, Singapore
Abstract :
Thermal effects on self-assembled FePt and FePtAg nanoparticles were investigated by using X-ray photoelectron spectroscopic measurements. A significant up-movement of carbonaceous coating of FePt and FePtAg annealed films was first observed during annealing. The movement is considered a crucial reason of the particle agglomeration and loss of positional order at high annealing temperatures. In the case of FePtAg nanopaticles, the rich Ag content of the surfaces of the annealed film suggests the Ag up-segregation during high temperature annealing treatment. In addition, Raman measurement reveals the carbonaceous surfaces of the FePt and FePtAg annealed films consist of amorphous carbon.
Keywords :
X-ray photoelectron spectra; annealing; iron alloys; magnetic anisotropy; magnetic recording; nanoparticles; platinum alloys; self-assembly; silver alloys; FePtAg; XPS; annealed films; carbonaceous coating; particle agglomeration; self assembled nanoparticles; thermal annealing; thermal effects study; x-ray photoelectron spectroscopic measurements; Annealing; Coatings; Iron; Magnetic films; Nanoparticles; Plasma measurements; Plasma temperature; Self-assembly; Spectroscopy; Surface treatment; Carbonaceous coating; FePt; Raman; X-ray photoelectron spectroscopic (XPS); coalescence of nanoparticles; self assembly;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.855331