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Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures
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10.1063/1.4738784
/content/aip/journal/apl/101/4/10.1063/1.4738784
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/4/10.1063/1.4738784
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Figures

Image of FIG. 1.
FIG. 1.

(a) Left and right images represent schematic drawings on a PZT/LSMO heterostructure and a LSMO thin film on STO, respectively. The electrodes for in-plane van der Pauw transport measurements were contacted to the LSMO layer. The image in the middle shows a part of the phase diagram of La1− x Sr x MnO3. (b) Topographic image of a PZT(10 nm)/LSMO(5 nm) heterostructure deposited on a (001) STO substrate, showing an atomically smooth surface with clear step-terrace structure. (c) PFM image of PZT on bottom electrode LSMO showing clear ferroelectric switching in the PZT layer. The contrast was produced by a conductive AFM tip under +2.5 V and −2.5 V, for downward (×) and upward (⊙) domains, respectively. Region I corresponds to as-grown background, and Regions II and III correspond to positively and negatively poled regions, respectively. (d) PFM image of a LAO on LSMO showing no piezoresponse. The scale bars on the images correspond to 400 nm.

Image of FIG. 2.
FIG. 2.

Transport and magnetic properties of ultrathin (5 nm) LSMO films with different capping layers of PZT, STO, and LAO. T C is marked with a triangle. (a) Temperature-dependent resistivity for LSMO with 10 nm capping layers. (b) Temperature-dependent magnetization of LSMO and LSMO with 10 nm capping layers thereon measured at 200 Oe. Inset shows magnetic hysteresis loops for corresponding samples measured at 10 K.

Image of FIG. 3.
FIG. 3.

LSMO thickness dependent transport and magnetic properties of LSMO films with 10 nm-thick PZT capping layers. T C for LSMO/STO and PZT/LSMO/STO heterostructures are marked with empty and solid triangles, respectively. Temperature-dependent (a) resistivity and (b) magnetization for 5, 10, and 30 nm LSMO with and without PZT capping layers. Inset shows the magnetic hysteresis loops for corresponding samples measured at 10 K.

Image of FIG. 4.
FIG. 4.

ρ(T) ratio, ΔT C, and Ms ratio at 10 K at 0.2 T between LSMO and PZT/LSMO, for different LSMO thicknesses. The value for the open circle symbol in dark blue (50 K) was estimated from extrapolation by fitting the resistivity curves with the Arrhenius function. The thick solid lines are guide to the eye.

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/content/aip/journal/apl/101/4/10.1063/1.4738784
2012-07-24
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Strongly coupled phase transition in ferroelectric/correlated electron oxide heterostructures
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/4/10.1063/1.4738784
10.1063/1.4738784
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