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Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

De Luca, G. M.
Preziosi, D.
Chiarella, F.
Di Capua, R.
Lettieri, S.
Salluzzo, M.
Published in Applied Physics Letters. 2013, vol. 103, no. 6, p. 062902
Abstract We studied the ferroelectric and ferromagnetic properties of compressive strained and unstrained BiMnO3 thin films grown by rf-magnetron sputtering. BiMnO3 samples exhibit a two-dimensional cube-on-cube growth mode and a pseudo-cubic structure up to a thickness of 15 nm and of 25 nm when deposited on (001) SrTiO3 and (110) DyScO3, respectively. Above these thicknesses, we observe a switching to a three-dimensional island growth mode and a simultaneous structural change to a (00l) oriented monoclinic unit cell. While ferromagnetism is observed below a T C   ≈  100 K for all samples, signatures of room temperature ferroelectricity were found only in the pseudo-cubic ultra-thin films, indicating a correlation between electronic and structural orders.
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Research group Groupe Triscone
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DE LUCA, G. M. et al. Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films. In: Applied Physics Letters, 2013, vol. 103, n° 6, p. 062902. https://archive-ouverte.unige.ch/unige:47226

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Deposited on : 2015-02-24

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