Title: Atomic-scale modification of hybrid FePt cluster-assembled films
Authors: Dobrynin, AN ×
Ievlev, DN
Verschoren, G
Swerts, J
Van Bael, Margriet
Temst, Kristiaan
Lievens, Peter
Piscopiello, E
Van Tendeloo, G
Zhou, SQ
Vantomme, André #
Issue Date: Mar-2006
Publisher: American physical soc
Series Title: Physical Review B vol:73 issue:10 pages:1-8
Article number: 104421
Abstract: We present a study on the production of iron-platinum bimetallic clusters with a laser vaporization cluster source, and subsequent low-energy cluster beam deposition in ultrahigh-vacuum conditions. Time-of-flight mass spectrometry investigations of the clusters in the gas phase show that FePt is a stable alloy at the nanoscale. Magnetic and structural properties of the deposited 2.25 +/- 0.5 nm cluster-assembled films with different Fe:Pt ratios are investigated with vibrating sample and superconducting quantum interference device magnetometry, Rutherford backscattering spectrometry, transmission electron microscopy, and x-ray diffraction. The as-deposited cluster films are highly porous and magnetically soft. A systematic study of the influence of annealing on the sample properties revealed that the chemically disordered-ordered phase transition only occurs in the cluster films with Fe:Pt ratio close to 1:1, and at temperatures higher than 500 degrees C. Combining magnetization and structural investigations we distinguish between the phase transition inside a single cluster and the coalescence of clusters, which starts to dominate at temperatures above 550 degrees C, leading to complete cluster intermixing on the atomic level.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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