Strain tilts spins:

Strain tilts spins:

Scientific Highlights Oxides for new-generation electronics 16 April 2013 5391 hits jags

Imagen4F. Jiménez-Villacorta, J. A. Gallastegui, I. Fina, X. Marti, and J. Fontcuberta

Phys. Rev. B 86, 024420 (2012)




Single-crystal (100)-oriented YMnO3 thin films grown on (110)-oriented SrTiO3 substrates have been studied by polarized extended x-ray absorption fine structure to determine the Mn-O bond lengths. Using a simple geometrical model and previously reported x-ray diffraction data on the same samples, the Mn-O-Mn bonding angles are calculated. We show that the epitaxy-induced in-plane anisotropic strain has a dramatic impact on the bonding angles, allowing the rationalization of the reported existence of cycloidal magnetic order and concomitant ferroelectricity in moderately strained films and the gradual suppression by larger strains. We shall argue that epitaxial strain allows shifting YMnO3 from an E-type to A-type antiferromagnetic ground state, crossing a cycloidal magnetic region.

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See more posts on ICMAB related to: Single-crystal , YMnO3 , thin films , SrTiO3 , substrates

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