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Epitaxial growth of thin films on MgO substrates: Structural, magnetic, and transport properties
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10.1063/1.2903522
/content/aip/journal/jap/103/9/10.1063/1.2903522
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/9/10.1063/1.2903522

Figures

Image of FIG. 1.
FIG. 1.

scan of an optimized LBMO film grown on MgO substrate; in the inset the -scan at the (103) reflection of the same LBMO film is also reported.

Image of FIG. 2.
FIG. 2.

Rocking curve measurements at the (004) reflection of LBMO films grown on MgO and on STO substrates. Because of the larger mismatch between the film/substrate in-plane lattice parameters, a larger dispersion (here magnified) of the -axis direction could arise, even with the in-plane axes alignment.

Image of FIG. 3.
FIG. 3.

Resistivity vs temperature behavior for a thick LBMO film on MgO substrate; the metallic ferromagnetic and the polaronic fitting curves are also reported. In the inset the distribution function is reported too.

Image of FIG. 4.
FIG. 4.

Temperature dependence of the resistance in zero field and for values of the external magnetic field of 35 and . In the inset the magnetoresistance is also reported for the same values of the external magnetic field.

Image of FIG. 5.
FIG. 5.

Magnetic measurements performed on a thick LBMO film grown on MgO substrate. The magnetization as a function of the temperature measured at (black) and (gray) are reported. For each value of the external magnetic field, the zero field cooled (ZFC) and the FC curves are shown. In particular, in the case of (gray curve), the ZFC and the FC curves almost coincide (for the sake of clarity, only the FC curve is reported). In the inset the inverse susceptibility on temperature is shown in the temperature interval around the ferromagnetic transition. The substrate magnetic moment is subtracted from all the measurements reported

Image of FIG. 6.
FIG. 6.

loop performed in the temperature range down to , on a thick LBMO film grown on MgO substrate. The arrows go toward the measurements performed at lower temperature. In the inset the saturation magnetization measured at as function of is shown.

Image of FIG. 7.
FIG. 7.

The normalized spectral density of voltage fluctuations of the LBMO films grown on MgO (upper panel) and STO (lower panel) substrates. The noise analysis has been carried out at the same reduced temperature of about (125 and for the film grown on MgO and STO substrates, respectively).

Image of FIG. 8.
FIG. 8.

On the left, a schematic qualitative representation (not in scale) of the LBMO film grown on MgO substrate at different temperatures (above and below the Curie temperature ) is reported. The darker zones are those associated to punctual defects and/or structural dislocations with depleted conducting/insulating properties. The lowest part (a) shows a zoom of these regions between two FM domains almost magnetically aligned below , with their possible magnetic response in the presence of an external magnetic field (b) or in the case of a spin-polarized current passing through the FM-domains (c).

Tables

Generic image for table
Table I.

Fitting parameters for the low-temperature ferromagnetic resistivity and the high-temperature thermal-activated polaronic resistivity . The data refer to the LBMO films reported in Fig. 3.

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/content/aip/journal/jap/103/9/10.1063/1.2903522
2008-05-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Epitaxial growth of La0.7Ba0.3MnO3 thin films on MgO substrates: Structural, magnetic, and transport properties
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/9/10.1063/1.2903522
10.1063/1.2903522
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