Concurrent magnetic and structural reconstructions at the interface of (111)-oriented 
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Hallsteinsen, Ingrid; Moreau, Magnus; Grutter, Alexander J.; Nord, Magnus; Vullum, Per Erik; Gilbert, Dustin A.; Bolstad, Torstein; Grepstad, J. K.; Holmestad, Randi; Selbach, Sverre M.; N’Diaye, Alpha T.; Kirby, Brian J.; Arenholz, Elke; Tybell, Thomas

doi:10.1103/physrevb.94.201115

Cited by 29 publications

(31 citation statements)

References 30 publications

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“…can achieve an enhanced magnetization of 240 ± 10 kA m −1 (1.50 ± 0.06 μ B Fe −1 ) at 10 K. Considering there are two exchange coupled BFO/LSMO interfaces, the thickness of the interfacial magnetic BFO layer is ∼ 4 u.c. The evidence of an upper thickness limit of interfacial magnetic BFO layer is in reasonable agreement with recent work . Using PNR, Béa et al obtained a BFO magnetic interfacial layer thickness of ≈2 nm (≈5 u.c.)…”

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confidence: 91%

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Spatially Resolved Large Magnetization in Ultrathin BiFeO₃

et al. 2017

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Here, a quantitative magnetic depth profile across the planar interfaces in BiFeO /La Sr MnO (BFO/LSMO) superlattices using polarized neutron reflectometry is obtained. An enhanced magnetization of 1.83 ± 0.16 μ /Fe in BFO layers is observed when they are interleaved between two manganite layers. The enhanced magnetic order in BFO persists up to 200 K. The depth dependence of magnetic moments in BFO/LSMO superlattices as a function of the BFO layer thickness is also explored. The results show the enhanced net magnetic moment in BFO from the LSMO/BFO interface extends 3-4 unit cells into BFO. The interior part of a thicker BFO layer has a much smaller magnetization, suggesting it still keeps the small canted AFM state. The results exclude charge transfer, intermixing, epitaxial strain, and octahedral rotations/tilts as dominating mechanisms for the large net magnetization in BFO. An explanation-one suggested by others previously and consistent with the observations-attributes the temperature dependence of the net magnetization of BFO to strong orbital hybridization between Fe and Mn across the interfaces. Such orbital reconstruction would establish an upper temperature limit for magnetic ordering of BFO.

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confidence: 91%

“…when in proximity to CoFeB. Similarly, Hallsteinsen et al found a large net magnetic moment of 1.6 ± 0.40 μ B Fe −1 in a nominally antiferromagnetic LaFeO 3 (LFO) film in proximity to LSMO. The magnetic interfacial layer extends 3–5 u.c.…”

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confidence: 86%

Spatially Resolved Large Magnetization in Ultrathin BiFeO₃

et al. 2017

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“…21,22 Furthermore, the different behavior between in-phase and out-of-phase rotations opens interesting vistas for tuning of perovskite iodides and bromides, where in-phase rotations are more common than in their oxide counterpart. 61 On the other hand, for the polar modes for ∼ 1, both the inplane and out-of-plane polarization is almost equally affected, and compressive (111)-strain suppresses the overall ferroelectricity.…”

Section: Discussion and Conclussionmentioning

confidence: 99%

“…3,[6][7][8][9][10][11][12] As shown in Figure 1, novel magnetic states, 21 which can induce a magnetic moment without charge transfer in (111)-oriented thin films. 22 Thus understanding general trends for how (111)-strain affects phonon frequencies, and developing routes to tailor soft and hard phonon modes in a material, is essential for rational design of new functional materials for electronic and spintronic applications.…”

Section: Introductionmentioning

confidence: 99%

Strain-phonon coupling in (111)-oriented perovskite oxides

et al. 2017

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Strain-phonon coupling, in terms of the shift in phonon frequencies under biaxial strain, is studied by density functional theory calculations for twenty perovskite oxides strained in their (111)-and (001)-planes. While the strain-phonon coupling under (001)-strain follows the established, intuitive trends, the response to (111)-strain is more complex. Here we show that strain-phonon coupling under (111)-strain can be rationalized in terms of the Goldschmidt tolerance factor and the formal cation oxidation states. The established trends for coupling between (111)-strain and in-phase and out-of-phase octahedral rotational modes as well as polar modes provide guidelines for rational design of (111)-oriented perovskite thin films.2

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“…By relying on a 4D STEM approach we combine HOLZ ring intensity, separated from the general HAADF contrast, with regular high-resolution ABF STEM imaging to quantify how oxygen octahedral tilting and A-site modulation appears in 3D. We use this to examine the structural modifications occurring in the LFO layer of a LSMO/LFO heterostructure grown on (111) SrTiO3 [6] (STO), and discuss based on the HOLZ measurements of LFO how oxygen octahedral tilting and Asite modulation are both clamped at the interfaces with both STO substrate and LSMO top layer, due to a change in tilt patterns.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional subnanoscale imaging of unit cell doubling due to octahedral tilting and cation modulation in strained perovskite thin films

Nord

Ross

McGrouther

et al. 2019

Phys. Rev. Materials

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Determining the 3-dimensional crystallography of a material with sub-nanometre resolution is essential to understanding strain effects in epitaxial thin films. A new scanning transmission electron microscopy imaging technique is demonstrated that visualises the presence and strength of atomic movements leading to a period doubling of the unit cell along the beam direction, using the intensity in an extra Laue zone ring in the back focal plane recorded using a pixelated detector method. This method is used together with conventional atomic resolution imaging in the plane perpendicular to the beam direction to gain information about the 3D crystal structure in an epitaxial thin film of LaFeO3 sandwiched between a substrate of (111) SrTiO3 and a top layer of La0.7Sr0.3MnO3. It is found that a hitherto unreported structure of LaFeO3 is formed under the unusual combination of compressive strain and (111) growth, which is triclinic with a periodicity doubling from primitive perovskite along one of the three <110> directions lying in the growth plane. This results from a combination of La-site modulation along the beam direction, and modulation of oxygen positions resulting from octahedral tilting. This transition to the perioddoubled cell is suppressed near both the substrate and near the La0.7Sr0.3MnO3 top layer due to the clamping of the octahedral tilting by the absence of tilting in the substrate and due to an incompatible tilt pattern being present in the La0.7Sr0.3MnO3 layer. This work shows a rapid and easy way of scanning for such transitions in thin films or other systems where disorder-order transitions or domain structures may be present and does not require the use of atomic resolution imaging, and could be done on any scanning TEM instrument equipped with a suitable camera. I.

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Concurrent magnetic and structural reconstructions at the interface of (111)-oriented La0.7Sr0.3MnO3

Cited by 29 publications

References 30 publications

Spatially Resolved Large Magnetization in Ultrathin BiFeO₃

Spatially Resolved Large Magnetization in Ultrathin BiFeO₃

Strain-phonon coupling in (111)-oriented perovskite oxides

Three-dimensional subnanoscale imaging of unit cell doubling due to octahedral tilting and cation modulation in strained perovskite thin films

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Concurrent magnetic and structural reconstructions at the interface of (111)-oriented La0.7Sr0.3MnO3

Cited by 29 publications

References 30 publications

Spatially Resolved Large Magnetization in Ultrathin BiFeO3

Spatially Resolved Large Magnetization in Ultrathin BiFeO3

Strain-phonon coupling in (111)-oriented perovskite oxides

Three-dimensional subnanoscale imaging of unit cell doubling due to octahedral tilting and cation modulation in strained perovskite thin films

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Spatially Resolved Large Magnetization in Ultrathin BiFeO₃

Spatially Resolved Large Magnetization in Ultrathin BiFeO₃