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Magnetoelastic response of La 0.7 Sr 0.3 MnO 3 / SrTiO 3 superlattices to reversible strain

Magnetoelastic response of La 0.7 Sr 0.3 MnO 3 / SrTiO 3 superlattices to reversible strain The influence of an electrically controlled biaxial in-plane strain on the magnetization of superlattices of ferromagnetic La 0.7 Sr 0.3 MnO 3 and SrTiO 3 was studied for single-layer thicknesses of d = 1.5–13 nm. Superlattices were grown by pulsed laser deposition on both SrTiO 3 (001) and piezoelectric 0.72Pb(Mg 1 / 3 Nb 2 / 3 )O 3 –0.28PbTiO 3 (001), or PMN-PT(001), substrates and have been structurally characterized by x-ray diffraction (XRD) and transmission electron microscopy. Grazing-incidence XRD reveals the vertical homogeneity of the piezoelectrically controlled reversible in-plane strain, even in a 600-nm-thick superlattice containing 100 oxide interfaces. The as-grown strain is almost identical in all superlattices that are coherently grown, with small variations resulting from the partially relaxed growth of the first La 0.7 Sr 0.3 MnO 3 layer on PMN-PT(001). The magnetic transition temperature decreases with the layer thickness d as a consequence of the finite layer thickness, and the strain-induced response of the magnetization changes its character from that of a long-range-ordered ferromagnet to that of a magnetically disordered (possibly electronically phase-separated) manganite. The strain response of a modified interface layer (“dead layer”) of the thickness d I is distinguished from that of the layer's interior by its different temperature dependence, allowing an estimation of 10 Å < d I < 16 Å for the superlattices on PMN-PT. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Magnetoelastic response of La 0.7 Sr 0.3 MnO 3 / SrTiO 3 superlattices to reversible strain

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2011 The American Physical Society
ISSN
1098-0121
eISSN
1550-235X
DOI
10.1103/PhysRevB.84.054463
Publisher site
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Abstract

The influence of an electrically controlled biaxial in-plane strain on the magnetization of superlattices of ferromagnetic La 0.7 Sr 0.3 MnO 3 and SrTiO 3 was studied for single-layer thicknesses of d = 1.5–13 nm. Superlattices were grown by pulsed laser deposition on both SrTiO 3 (001) and piezoelectric 0.72Pb(Mg 1 / 3 Nb 2 / 3 )O 3 –0.28PbTiO 3 (001), or PMN-PT(001), substrates and have been structurally characterized by x-ray diffraction (XRD) and transmission electron microscopy. Grazing-incidence XRD reveals the vertical homogeneity of the piezoelectrically controlled reversible in-plane strain, even in a 600-nm-thick superlattice containing 100 oxide interfaces. The as-grown strain is almost identical in all superlattices that are coherently grown, with small variations resulting from the partially relaxed growth of the first La 0.7 Sr 0.3 MnO 3 layer on PMN-PT(001). The magnetic transition temperature decreases with the layer thickness d as a consequence of the finite layer thickness, and the strain-induced response of the magnetization changes its character from that of a long-range-ordered ferromagnet to that of a magnetically disordered (possibly electronically phase-separated) manganite. The strain response of a modified interface layer (“dead layer”) of the thickness d I is distinguished from that of the layer's interior by its different temperature dependence, allowing an estimation of 10 Å < d I < 16 Å for the superlattices on PMN-PT.

Journal

Physical Review B – American Physical Society (APS)

Published: Aug 1, 2011

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