Control of Octahedral Tilts and Magnetic Properties of Perovskite Oxide Heterostructures by Substrate Symmetry

He, Jun; Borisevich, Albina Y.; Kalinin, Sergei V.; Pennycook, Stephen J.; Pantelides, Sokrates T.

doi:10.1103/physrevlett.105.227203

Cited by 233 publications

(213 citation statements)

References 43 publications

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“…Indeed, similar scenarios have been predicted for perovskite heterostructures in the static case [38]. Propagation of the phase would then be driven by electronic rather than magnetic effects.…”

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confidence: 74%

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

et al. 2015

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Diffraction is used to determine the spatial and temporal evolution of the magnetic disordering. We observe a magnetic melt front that grows from the substrate interface into the film, at a speed that suggests electronically driven propagation.Light control and ultrafast phase front propagation at hetero-interfaces may lead to new opportunities in optomagnetism, for example by driving domain wall motion to transport information across suitably designed devices. 3/25! ! !In transition metal oxides, rearrangements in electronic and magnetic properties can be triggered by the application of magnetic [5] and electric fields [6], or pressure [7,8].Switching has also been demonstrated in these materials using femtosecond optical excitation, at near-visible [9,10,11,12,13,14,15], mid-infrared [16,17,18,19,20] edge. The bandwidth of the X-ray pulses was reduced to below 1 eV by a grating monochromator. Diffracted X-rays were detected as function of the time delay relative to the mid-infrared excitation pulses. An avalanche photodiode enabled pulse-to-pulse normalization of the diffracted to the incident light intensity. where the latter is limited by the jitter between the FEL and the optical laser. We compare these dynamics to the time needed for the film to become metallic, as measured by the transient reflectivity in the 1−5 THz range induced by the same mid-infrared excitation (green dots in Fig. 1(d)). These two similar timescales, which reflect only average changes over the whole film, suggest an intimate connection between the insulator-to-metal transition and the melting of magnetic order.In Figure 2, we plot the transient θ-2θ scans for the (1/4 1/4 1/4) diffraction peak, sensitive to the out-of-plane antiferromagnetic ordering. In equilibrium, i.e. at negative time delay, a narrow diffraction peak and Laue oscillations are observed, attesting to the presence of magnetic order across the entire 30-nm film height, with sharp magnetic boundaries.Figure 2 further shows that a significant peak broadening and a suppression of the Laue oscillations accompany the strong photo-induced reduction in peak intensity. The broadening of the diffraction peak implies that the excitation melts the magnetic order only over a fraction of the film along the sample growth direction. Secondly, the suppression of the Laue oscillations indicates that the boundary between the ordered and disordered regions of the film is not sharp.We also find that throughout these dynamics the in-plane correlation length, as measured by transverse rocking curves (θ scans), remains unchanged (see Supplementary 6/25! ! ! Information). Hence, the dynamics discussed here are one dimensional, evolving along the sample growth direction.!The spatial distribution of the magnetic order at a time delay τ was analyzed quantitatively with the following expression for kinematic diffractionHere, the magnetic profile is represented by the space-and time-dependent structure factor F(z,τ), where ! = 4! sin ! ! is the magnitude of the scattering wave vector (with θ th...

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confidence: 74%

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

et al. 2015

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“…18,19 Recent reports discuss manipulation of the octahedral structure in perovskite thin film systems, and thus of their functional properties, using epitaxial strain. 11,20 In this work, we show how the AFM easy axes are modified in epitaxial LaFeO3/La0.7Sr0.3MnO3 (LFO/LSMO) thin film bilayers, compared to LFO grown directly on (001)-oriented Nb-doped SrTiO3 (Nb:STO). Moreover, we demonstrate how the width and crystalline orientation of nanowires defined in these LFO/LSMO bilayers serve to stabilize extended AFM domains selectively along different easy axes.…”

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confidence: 99%

“…The possibility to control magnetism in thin films and multilayers of perovskite oxides by epitaxial strain, [1][2][3] oxygen stoichiometry, 4-7 chemical substitution, 8,9 and substrate crystalline symmetry 10,11 has rendered such materials important model systems for fundamental studies of magnetic structure as well as attractive candidates for device applications. Advances in fabrication of complex oxide thin film nanostructures 12 and the recent development of novel tools for magnetic imaging with high spatial resolution have made the study of such systems on the nanometer length scale a realistic endeavor.…”

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Effects of nanostructuring and substrate symmetry on antiferromagnetic domain structure in LaFeO3thin films

et al. 2011

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“…Symmetry mismatch between the film and substrate are known to influence at least the first atomic layer. [6,10,40] In our film, the symmetry mismatch is the result of the planar symmetry differences between the CoO 4 tetrahedra and TiO 6 octahedra that lead to asymmetric cation displacements at the interface as evidenced by the contraction and expansion of atomic spacing. Related perovskite oxides containing mixed valent B-site cations can exhibit modulations in the atomic spacing due to breathing distortions, in which the size of the polyhedra can change in order to accommodate charge disproportion and the resultant changes in the ionic radii.…”

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confidence: 99%

“…[5][6][7][8][9][10][11][12][13][14][15][16] Symmetry mismatch occurs when the interface is formed from two non-isostructural materials such as an orthorhombic film on a cubic substrate, or even materials consisting of different coordination environments.…”

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Symmetry‐Driven Atomic Rearrangement at a Brownmillerite–Perovskite Interface

Meyer

Jeen

Gao

et al. 2015

Adv Elect Materials

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The design of new materials has transformed considerably over the past decade from an emphasis on tailoring bulk properties to those isolated at the interface between two materials.Undoubtedly, many would argue that the interface is the key to new, multifunctional materials and devices. Examples include the discovery of a 2-dimensional electron gas (2DEG) and thermopower enhancement in LaTiO 3 /SrTiO 3 (STO) heterostructures [1][2][3] , electric-field control of spin polarization between ferroelectric and ferromagnetic film layers [4] and colossal ionic conductivity at the yttria-stabilized ZrO 2 (YSZ)/STO interface [5] . The strong property modification in heterostructures such as these suggests that the structural, electronic, lattice and orbital degrees of freedom at the interface can be tuned from the individual constituents.Many of the interfacial properties that have drawn significant attention have been linked to structural effects induced by lattice or symmetry mismatch. [5][6][7][8][9][10][11][12][13][14][15][16] Symmetry mismatch occurs when the interface is formed from two non-isostructural materials such as an orthorhombic film on a cubic substrate, or even materials consisting of different coordination environments.While it is possible for non-isostructural bilayers to contain a negligible average lattice mismatch, low symmetry materials grown on higher symmetry substrates will likely exhibit an unavoidable non-uniform strain due to different lattice parameters along the in-plane

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Control of Octahedral Tilts and Magnetic Properties of Perovskite Oxide Heterostructures by Substrate Symmetry

Cited by 233 publications

References 43 publications

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

Effects of nanostructuring and substrate symmetry on antiferromagnetic domain structure in LaFeO3thin films

Symmetry‐Driven Atomic Rearrangement at a Brownmillerite–Perovskite Interface

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