Dislocation Energetics in Epitaxial Strained Islands

Shape Transition and Dislocation Nucleation in Strained Epitaxial Islands

J. Jalkanen 1, O. Trushin 2, E. Granato 3, S.C. Ying 4, and T. Ala-Nissila 1,4 1 Laboratory of Physics, P.O. Box 1100, Helsinki University of Technology, FIN–02015 HUT, Espoo, Finland 2 Institute of Microelectronics and Informatics, Academy of Sciences of Russia, Yaroslavl 150007, Russia 3 Laboratório Associado de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais, 12245-970 São Jo...

Magnetism of Fe clusters and islands on Pt surfaces

Clusters and islands of Fe atoms have been prepared by noble gas buffer layer assisted growth as well as by standard molecular beam epitaxy on Pt substrates. Xe buffer layers have been utilized to promote the formation of compact, relaxed Fe clusters with narrow size distribution. Without the Xe buffer, strained Fe islands with a characteristic misfit dislocation network are formed. Magnetizati...

Equilibrium shape and dislocation nucleation in strained epitaxial nanoislands

Mechanics of coherent and dislocated island morphologies in strained epitaxial material systems

A combined analytical and computational model is developed to study the mechanics of strained epitaxial island growth in typical semiconductor systems. Under certain growth conditions in systems with a film/substrate lattice mismatch, deposited material is known to aggregate into islandlike shapes with geometries having arc shaped cross-sections. A two-dimensional model assuming linear elastic ...

Epitaxial growth of highly-crystalline spinel ferrite thin films on perovskite substrates for all-oxide devices

The potential growth modes for epitaxial growth of Fe3O4 on SrTiO3 (001) are investigated through control of the energetics of the pulsed-laser deposition growth process (via substrate temperature and laser fluence). We find that Fe3O4 grows epitaxially in three distinct growth modes: 2D-like, island, and 3D-to-2D, the last of which is characterized by films that begin growth in an island growt...