Spatial control of functional properties via octahedral modulations in complex oxide superlattices

Moon, Eun Ju; Colby, Robert; Wang, Qi; Karapetrova, Evguenia; Schleputz, C. M.; Fitzsimmons, M. R.; May, Steven J.

doi:10.1038/ncomms6710

Cited by 80 publications

(87 citation statements)

References 43 publications

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“…The short length scale for interfacial octahedral coupling can be exploited to induce new magnetic phenomena, distinct from strain-driven effects, not present in compositionally equivalent bulk counterparts. For example, the distance between interfaces in a series of isovalent (La 0.7 Sr 0.3 MnO 3 ) n /(Eu 0.7 Sr 0.3 MnO 3 ) n superlattices was tuned to be either greater than or less than the octahedral coupling length scale by changing n , leading to modulated or uniform octahedral and magnetic behavior [Moon et al ., 2014b]. …”

Section: Emergent Magnetism At Interfacesmentioning

confidence: 99%

Interface-induced phenomena in magnetism

et al. 2017

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This article reviews static and dynamic interfacial effects in magnetism, focusing on interfacially-driven magnetic effects and phenomena associated with spin-orbit coupling and intrinsic symmetry breaking at interfaces. It provides a historical background and literature survey, but focuses on recent progress, identifying the most exciting new scientific results and pointing to promising future research directions. It starts with an introduction and overview of how basic magnetic properties are affected by interfaces, then turns to a discussion of charge and spin transport through and near interfaces and how these can be used to control the properties of the magnetic layer. Important concepts include spin accumulation, spin currents, spin transfer torque, and spin pumping. An overview is provided to the current state of knowledge and existing review literature on interfacial effects such as exchange bias, exchange spring magnets, spin Hall effect, oxide heterostructures, and topological insulators. The article highlights recent discoveries of interface-induced magnetism and non-collinear spin textures, non-linear dynamics including spin torque transfer and magnetization reversal induced by interfaces, and interfacial effects in ultrafast magnetization processes.

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Section: Emergent Magnetism At Interfacesmentioning

confidence: 99%

Interface-induced phenomena in magnetism

et al. 2017

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“…[1][2][3][4] Recently, the control of local atomic structure, in particular BO 6 octahedral distortions and rotations and A-site displacements, has emerged as a promising strategy for designing functional properties in perovskite films. [5][6][7][8] One example of structure-driven design in oxide heterostructures is the prediction of hybrid improper ferroelectricity in (A ′ BO 3 )/(ABO 3 ) superlattices where both A ′ BO 3 and ABO 3 are perovskites that exhibit the orthorhombic P bnm structure in bulk. [9][10][11][12] In such superlattices, the inequivalent displacements of the A and A ′ cations produce a ferrielectric state.…”

Section: Introductionmentioning

confidence: 99%

Octahedral rotation patterns in strainedEuFeO3and otherPbnmperovskite films: Implications for hybrid improper ferroelectricity

et al. 2016

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We report the relationship between epitaxial strain and the crystallographic orientation of the inphase rotation axis and A-site displacements in P bnm-type perovskite films. Synchrotron diffraction measurements of EuFeO3 films under strain states ranging from 2 % compressive to 0.9 % tensile on cubic or rhombohedral substrates exhibit a combination of a − a + c − and a + a − c − rotational patterns. We compare the EuFeO3 behavior with previously reported experimental and theoretical work on strained P bnm-type films on non-orthorhombic substrates, as well as additional measurements from LaGaO3, LaFeO3, and Eu0.7Sr0.3MnO3 films on SrTiO3. Compiling the results from various material systems reveals a general strain dependence in which compressive strain strongly favors a − a + c − and a + a − c − rotation patterns and tensile strain weakly favors a − a − c + structures. In contrast, EuFeO3 films grown on P bnm-type GdScO3 under 2.3 % tensile strain take on a uniform a − a + c − rotation pattern imprinted from the substrate, despite strain energy considerations that favor the a − a − c + pattern. These results point to the use of substrate imprinting as a more robust route than strain for tuning the crystallographic orientations of the octahedral rotations and A-site displacements needed to realize rotation-induced hybrid improper ferroelectricity in oxide heterostructures.

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“…[14][15][16][17][18][19][20][21] The recent development of annular bright-field (ABF) imaging in STEM allows for simultaneous mapping of both light and heavy elements [22][23][24] and makes it possible to visualize oxygen coordination environments in the heterostructures. 18,25,26 Fast multiple-image acquisition and drift correction techniques using a cross correlation of the images 27 have been also demonstrated to minimize the image distortions due to drifts in both the specimen and incident probe in STEM, and consequently, the atomic positions for all constituent atoms-including oxygen-can be determined with sub-Ångström precision.…”

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confidence: 99%

Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

et al. 2015

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Interface engineering of structural distortions is a key for exploring the functional properties of oxide heterostructures and superlattices. In this paper, we report on our comprehensive investigations of oxygen octahedral distortions at the heterointerface between perovskite oxides SrRuO3 and BaTiO3 on GdScO3 substrates and of the influences of the interfacially engineered distortions on the magneto-transport properties of the SrRuO3 layer. Our state-of-the-art annular bright-field imaging in aberration-corrected scanning transmission electron microscopy revealed that the RuO6 octahedral distortions in the SrRuO3 layer have strong dependence on the stacking order of the SrRuO3 and BaTiO3 layers on the substrate. This can be attributed to the difference in the interfacial octahedral connections. We also found that the stacking order of the oxide layers has a strong impact on the magneto-transport properties, allowing for control of the magnetic anisotropy of the SrRuO3 layer through interface engineering. Our results demonstrate the significance of the interface engineering of the octahedral distortions on the structural and physical properties of perovskite oxides.

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Spatial control of functional properties via octahedral modulations in complex oxide superlattices

Cited by 80 publications

References 43 publications

Interface-induced phenomena in magnetism

Interface-induced phenomena in magnetism

Octahedral rotation patterns in strainedEuFeO3and otherPbnmperovskite films: Implications for hybrid improper ferroelectricity

Research Update: Interface-engineered oxygen octahedral tilts in perovskite oxide heterostructures

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