Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films
Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films
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DOI：
10.1063/1.4818136
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发表时间：
2013-08-05
影响因子：
4
通讯作者：
Salluzzo, M.
中科院分区：
文献类型：
--
作者：
De Luca, G. M.;Preziosi, D.;Salluzzo, M.
研究了用射频磁控溅射法制备的压应变和无应变BiMnO_3薄膜的铁电和铁磁性质。BiMnO 3样品在（001）SrTiO 3和（110）DyScO 3上分别呈现二维立方叠立方生长模式和伪立方结构，厚度分别为15 nm和25 nm。在这些厚度以上，我们观察到一个三维岛生长模式的切换和同时的结构变化（00 l）取向的单斜晶胞。虽然在T-C接近100 K的温度下观察到所有样品的铁磁性，但仅在伪立方超薄膜中发现了室温铁电性的特征，表明电子和结构有序之间的相关性。(C)2013 AIP Publishing LLC.
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 approximate to 100K 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. (C) 2013 AIP Publishing LLC.