[institut] Seminar centra za fiziku čvrstog stanja i nove materijale

[Zoran Popovic]

Poštovane koleginice i kolege,

u četvrtak 26.12.2013 u 12.00 u čitaonici IF-a

Zorica Konstantinović iz Instituta za nauku o materijalima  
Univerziteta u Barceloni, održaće seminar pod naslovom:


Self-assembled nanostructured manganite thin films

Z. Konstantinović1, J. Santiso2, F. Sandiumenge1, A. Pomar1, Ll. 
Balcells1 and B. Martinez1

1 Institut de Ciència de Materials de Barcelona-CSIC, Campus de la UAB, 
08193 Bellaterra, Spain
2 Centro de Investigación en Nanociencia y Nanotechnologia, CSIC-ICN, 
Campus UAB, 08913 Bellaterra, Spain

Oxide thin films often exhibit a tendency toward self-organized growth 
forming regular arrays of three dimensional nanostructures. This 
behaviour offers enormous potential for the implementation of new 
nanodevices, while at the same time attracts great attention due to 
their rich physics. Among them, manganese perovskites showing colossal 
magnetoresistance and half metallic characteristics have emerged as 
promising candidates for miniature spintronic devices.
Highly epitaxial La2/3Sr1/3MnO3 (LSMO) thin films are elastically 
strained due to film-substrate lattice mismatch and this lattice strain 
can, in some cases, select preferential growth modes leading to the 
appearance of different self-organized nanostructured morphologies, 
including antidot formation. The self-organization process is directly 
promoted by the regular arrangement of atomic steps of the underluying 
vicinal substrate. The antidot array forms independently of the lattice 
strain induced using different substrates and indicates the importance 
of kinetic effects (adatom diffusion processes on surface). The 
experimental morphological phase diagram shows that the deposition rate 
and surface mobility must be chosen within a narrow window in the order 
to achieve self-organized nanostructures formation, which compete with 
mound formation and step flow regime. The implementation of 
self-assembled nanoparticles on the top of the self-organized 
morphologies is explored.

Srdačan pozdrav
Zoran V. Popović
-- 
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
http://www.ipb.ac.rs/