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Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films
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10.1063/1.4818136
/content/aip/journal/apl/103/6/10.1063/1.4818136
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/6/10.1063/1.4818136
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Figures

Image of FIG. 1.
FIG. 1.

AFM images of different thickness BMO films grown on STO and DSO substrates: (a) 10 nm-thick BMO on STO (root mean squared (rms) roughness = 0.137 nm); (b) 10 nm-thick BMO on DSO (rms roughness = 0.140 nm); (c) 60 nm-thick BMO on STO (rms roughness = 0.925 nm); (d) 60 nm-thick BMO on DSO (rms roughness = 1.771 nm).

Image of FIG. 2.
FIG. 2.

θ-2θ x-ray diffraction on (a) 60 nm-thick BMO film deposited on (001) STO, (b) 10 nm-thick BMO grown on STO, and (c) 10 nm-thick BMO grown on DSO substrates. Finite size effect oscillations can be observed on the pseudo-cubic films in (b) and (c). (d) A sketch of a plausible structural model of pseudo-cubic and monoclinic BMO deposited on STO.

Image of FIG. 3.
FIG. 3.

Temperature dependence of the magnetization obtained using sum rules applied to XMCD spectra acquired on 10 nm-thick BMO films deposited on STO (black open circle) and DSO (full red square). The data have been acquired warming up of the samples from 8 K to 300 K in a field of 2T, almost parallel to the surface. The inset shows an example of Mn edge XMCD spectra (10 K, 3 T).

Image of FIG. 4.
FIG. 4.

(a) PFM amplitude image obtained over a 5 m×5 m area on a 10 nm-thick BMO film on STO, showing a complex pattern created by applying positive (bright regions) and negative (dark regions) tip bias voltages of ±8 V. (b) Phase vs. bias voltage and amplitude vs. bias voltage hysteresis loops obtained on a given location of the sample. (c) PFM amplitude as function of the time acquired on a 10 nm-thick BMO thin film grown on DSO. The red line is a fit using Eq. (2) .

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/content/aip/journal/apl/103/6/10.1063/1.4818136
2013-08-07
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/6/10.1063/1.4818136
10.1063/1.4818136
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