Physics – Condensed Matter – Materials Science
Scientific paper
2010-08-02
Physics
Condensed Matter
Materials Science
5pages, 3figures (color online). Revised version including estimation of domain wall magnetization; reference to Salje et al.
Scientific paper
Thin films of orthorhombic TbMnO$_3$, as well as other orthorhombic manganites, epitaxially grown on cubic SrTiO$_3$ substrates display an induced magnetic moment that is absent in the bulk (antiferromagnetic) counterpart. Here we show that there is a clear correlation between the domain microstructure and the induced magnetic moment in TbMnO$_3$ films on SrTiO$_3$. In addition, the distinct dependence of the magnetization with the film thickness is not consistent with domain magnetism and indicates that the domain walls, rather than the domains, are the origin of the net magnetic moment. Since the orientation of the domain walls can be designed by the film-substrate relationship and its density can be tuned with the film thickness, these results represent a significant step forward towards the design of devices based on domain wall functionality.
Daumont Christophe J. M.
de Hosson Jeff Th. M.
Kooi Bart J.
Noheda Beatriz
Venkatesan Sriram
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