5 research outputs found
Influence of external magnetic fields on growth of alloy nanoclusters
Kinetic Monte Carlo simulations are performed to study the influence of
external magnetic fields on the growth of magnetic fcc binary alloy
nanoclusters with perpendicular magnetic anisotropy. The underlying kinetic
model is designed to describe essential structural and magnetic properties of
CoPt_3-type clusters grown on a weakly interacting substrate through molecular
beam epitaxy. The results suggest that perpendicular magnetic anisotropy can be
enhanced when the field is applied during growth. For equilibrium bulk systems
a significant shift of the onset temperature for L1_2 ordering is found, in
agreement with predictions from Landau theory. Stronger field induced effects
can be expected for magnetic fcc-alloys undergoing L1_0 ordering.Comment: 10 pages, 3 figure
Kinetic growth of nanoclusters with perpendicular magnetic anisotropy
The growth of binary-alloy clusters on a weakly interacting
substrate through codeposition of two atomic species is studied by
kinetic Monte Carlo simulation. Our model describes salient features
of CoPt3 nanoclusters, as obtained recently by the molecular-beam
epitaxy technique. The clusters display perpendicular magnetic
anisotropy (PMA) in a temperature window of growth favorable for
applications. This temperature window is found to arise from the
interplay of Pt surface segregation and aspect ratio for cluster
shapes. Conclusions are drawn on how to optimize growth parameters
with respect to PMA