Thursday, June 6, 2013

1306.1192 (G. M. De Luca et al.)

Ferromagnetism and Ferroelectricity in epitaxial ultra-thin BiMnO3 films    [PDF]

G. M. De Luca, D. Preziosi, F. Chiarella, R. Di Capua, S. Gariglio, S. Lettieri, M. Salluzzo
We studied the ferroelectric and ferromagnetic properties of compressive strained and unstrained BiMnO3 thin films grown by rf-magnetron sputtering. BiMnO3 samples exhibit a 2D cube-on-cube growth mode and a pseudo-cubic struc-ture 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 3D island growth and a simultaneous structural change to a monoclinic structure characterized by a (00l) orientation of the monoclinic unit cell. While ferromagnetism is observed below Tc = 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.
View original: http://arxiv.org/abs/1306.1192

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