Physics – Condensed Matter – Materials Science
Scientific paper
2008-11-24
Physics
Condensed Matter
Materials Science
Revtex, 7 pages, two columns, 10 color figures Final version as accepted for publication in Journal of Physics: Condensed Matt
Scientific paper
10.1088/0953-8984/21/18/182001
TbMnO$_{3}$ films have been grown under compressive strain on (001)-oriented SrTiO$_{3}$ crystals. They have an orthorhombic structure and display the (001) orientation. With increasing thickness, the structure evolves from a more symmetric (tetragonal) to a less symmetric (bulk-like orthorhombic) structure, while keeping constant the in-plane compression thereby leaving the out-of-plane lattice spacing unchanged. The domain microstructure of the films is also revealed, showing an increasing number of orthorhombic domains as the thickness is decreased: we directly observe ferroelastic domains as narrow as 4nm. The high density of domain walls may explain the induced ferromagnetism observed in the films, while both the decreased anisotropy and the small size of the domains could account for the absence of a ferroelectric spin spiral phase.
Catalan Gavriel
Daumont Christophe J. M.
de Hosson Jeff Th. M.
Kooi Bart J.
Mannix D.
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