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Magnetism-induced ferroelectric polarization in the -axis-oriented orthorhombic thin films
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View: Figures


Image of FIG. 1.
FIG. 1.

The XRD diffraction patterns of the -HMO thin films grown on STO(001) substrates. (a) The typical scans (intensity plotted in logarithmic scale) reveal that HMO films are indeed orthorhombic with nearly perfect -axis-oriented characteristic. The inset in (a) shows the rocking curve of the -HMO (004) peak. (b) The azimuthal -scans (intensity plotted on a logarithmic scale) of the (202) peak of the -HMO films, displaying the nearly ideal alignment of crystallographic orientations between film and substrate. The inset of (b) is a AFM topographic image of a thick -HMO film deposited on STO(001) substrate.

Image of FIG. 2.
FIG. 2.

(a) The ZFC temperature dependent magnetizations [ZFC-] for -HMO film probed along the -axis and the -plane with an applied magnetic field of . Both reveal an AF transition temperature of . The inset in (a) shows the FC- and ZFC- over the whole temperature range measured along the -axis at . (b) The ZFC- along the -axis measured at 100 and . (For the sake of clarity the curve is slightly shifted.) The difference seen in for the 100 and results is mainly due to different measuring temperature intervals used during measurements. As shown in the upper-right inset, when we change the temperature interval from and remeasure part of the curve (indicated by the square frame), it evidently displays exactly the same as seen on the curve measured with the same temperature interval. The lower-left inset shows that the similar feature also occurs for -HMO/Nb-STO film with a magnetic field of .

Image of FIG. 3.
FIG. 3.

hysteresis loops of the -HMO thin film grown on Nb-doped STO(001) substrates measured at various temperatures. The inset shows the remnant polarization obtained by pulsed polarization measurement at various temperatures.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetism-induced ferroelectric polarization in the c-axis-oriented orthorhombic HoMnO3 thin films