Interface-driven topological Hall effect in SrRuO
            <sub>3</sub>
            -SrIrO
            <sub>3</sub>
            bilayer

Matsuno, Jobu; Ogawa, Norio; Yasuda, K.; Kagawa, Fumitaka; Koshibae, Wataru; Nagaosa, Naoto; Tokura, Y.; Kawasaki, Masashi

doi:10.1126/sciadv.1600304

Cited by 420 publications

(432 citation statements)

References 45 publications

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“…There have been a large number of reports along this direction [10], and we anticipate this field will continue to grow rapidly [11]. Because of the renewed interest in the relativistic spinorbit coupling (SOC) with correlations, iridium-based systems have started to attract significant interest [12].There have already appeared a number of theoretical predictions for novel phenomena [13][14][15][16] and experimental studies [17][18][19] using perovskite-type iridates. Recently, superlattices of SrIrO 3 (SIO) and SrMnO 3 (SMO) were epitaxially grown and their transport and magnetic properties were reported [20].…”

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confidence: 99%

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Charge Transfer in Iridate-Manganite Superlattices

et al. 2017

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Charge transfer in superlattices consisting of SrIrO3 and SrMnO3 is investigated using density functional theory. Despite the nearly identical work function and non-polar interfaces between SrIrO3 and SrMnO3, rather large charge transfer was experimentally reported at the interface between them. Here, we report a microscopic model that captures the mechanism behind this phenomenon, providing a qualitative understanding of the experimental observation. This leads to unique strain dependence of such charge transfer in iridate-manganite superlattices. The predicted behavior is consistently verified by experiment with soft x-ray and optical spectroscopy. Our work thus demonstrates a new route to control electronic states in non-polar oxide heterostructures.Electron density is one of the most important parameters controlling electronic phases in strongly correlated electron systems. As a milestone in condensed matter physics, high critical temperature superconductivity was discovered in Cu-based oxides by doping carriers into Mott insulating states [1]. This triggered an improvement in crystal synthesis techniques, leading to the discovery of a number of novel spin, charge and orbital states in complex oxide materials [2]. Thin film growth techniques have also improved dramatically [3,4]. In Ref.[4], Ohtomo et al. demonstrated atomically sharp interfaces between two insulating titanates with a metallic behavior. Such metallic interfaces led to the concept of electronic reconstruction originally proposed for K-doped C 60 systems [5,6]. One of the important aspects of the electronic reconstruction is that the valence state of constituent ions in such heterostructures can significantly differ from the corresponding valence state in bulk systems as a result of the electron transfer within the heterostructures. Such electron transfer can be manipulated by the polar discontinuity [7] or by the difference in the work functions [8]. The polar discontinuity was previously discussed in the context of III-V semiconductor heterostructures [9]. In this case, the discontinuity often leads to the atomic reconstruction because it is significantly more challenging to change the valence state than for transition-metal elements.Thus, hetero-structuring is expected to become a fascinating route to explore novel electronic states in complex * Copyright notice: This manuscript has been authored by UTBattelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan) † okapon@ornl.gov systems ...

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confidence: 99%

“…There have already appeared a number of theoretical predictions for novel phenomena [13][14][15][16] and experimental studies [17][18][19] using perovskite-type iridates. Recently, superlattices of SrIrO 3 (SIO) and SrMnO 3 (SMO) were epitaxially grown and their transport and magnetic properties were reported [20].…”

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confidence: 99%

Charge Transfer in Iridate-Manganite Superlattices

et al. 2017

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“…Skyrmions are a result of the Dzyaloshinskii-Moriya interaction in chiral magnets with a non-centrosymmetric crystal structure, such as MnSi [6], and they have generated significant interest for application in nonvolatile memories [2]. The topological Hall effect has also been observed in centrosymmetric crystals, such as SrFe1-xCoxO3 and pyrochlores [7,8], where helical structures form as a result of magnetic frustration, and in thin films, where inversion symmetry may be lifted by interfaces and surfaces [9,10]. Oxide films and interfaces that support topologically nontrivial spin textures and whose carrier density can be manipulated are interesting, because the potential for control by electric field effect and because proximity effects can be utilized to realize other exotic states within all-epitaxial heterostructures.…”

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confidence: 99%

Evidence of a topological Hall effect in Eu1−xSmxTiO3

Ahadi

Galletti

Stemmer

2017

Applied Physics Letters

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We report on the observation of a possible topological Hall effect in thin films of the itinerant ferromagnet Eu1−xSmxTiO3. EuTiO3 and Eu0.955Sm0.045TiO3 films were grown by molecular beam epitaxy. The EuTiO3 film is insulating. The Hall resistivity of the Eu0.955Sm0.045TiO3 films exhibits the anomalous Hall effect below the Curie temperature of ∼5 K and additional features that appear at 2 K. It is shown that these features are magnetic in origin and consistent with the topological Hall effect seen in material systems with topologically nontrivial spin textures such as skyrmions. The results open up interesting possibilities for epitaxial hybrid heterostructures that combine topological magnetic states, tunable carrier densities, and other phenomena.

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“…This new strategy to control PMA can potentially be extended to a wider class of materials. The tunable interfacial PMA, combined with the broken inversion symmetry and SOC effect, also reveals the ideal candidates to search for emergent magnetic textures and topological phenomena in TMOs [47].…”

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confidence: 99%

Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La1−xSrxMnO
Yi
¹
,
Flint
²
,
Balakrishnan
³

et al. 2017
Phys. Rev. Lett.
115
9
91
1
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Perpendicular magnetic anisotropy (PMA) plays a critical role in the development of spintronics, thereby demanding new strategies to control PMA. Here we demonstrate a conceptually new type of interface induced PMA that is controlled by oxygen octahedral rotation. In superlattices comprised of La1−xSrxMnO3 and SrIrO3, we find that all superlattices (0≤x ≤1) exhibit ferromagnetism despite the fact that La1−xSrxMnO3 is antiferromagnetic for x >0.5. PMA as high as 4×10 6 erg/cm 3 is observed by increasing x and attributed to a decrease of oxygen octahedral rotation at interfaces. We also demonstrate that oxygen octahedral deformation cannot explain the trend in PMA. These results reveal a new degree of freedom to control PMA, enabling discovery of emergent magnetic textures and topological phenomena.

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Interface-driven topological Hall effect in SrRuO ₃ -SrIrO ₃ bilayer

Abstract: Electronic transport measurements reveal the formation of swirling spin textures, skyrmions, at high-quality oxide interface.

Cited by 420 publications

References 45 publications

Charge Transfer in Iridate-Manganite Superlattices

Charge Transfer in Iridate-Manganite Superlattices

Evidence of a topological Hall effect in Eu1−xSmxTiO3

Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La1−xSrxMnO
Yi
¹
,
Flint
²
,
Balakrishnan
³

et al. 2017
Phys. Rev. Lett.
115
9
91
1
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Interface-driven topological Hall effect in SrRuO 3 -SrIrO 3 bilayer

Abstract: Electronic transport measurements reveal the formation of swirling spin textures, skyrmions, at high-quality oxide interface.

Cited by 420 publications

References 45 publications

Charge Transfer in Iridate-Manganite Superlattices

Charge Transfer in Iridate-Manganite Superlattices

Evidence of a topological Hall effect in Eu1−xSmxTiO3

Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La1−xSrxMnOYi1, Flint2, Balakrishnan3 et al. 2017Phys. Rev. Lett.1159911View full textAdd to dashboardCite

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Interface-driven topological Hall effect in SrRuO ₃ -SrIrO ₃ bilayer

Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La1−xSrxMnO
Yi
¹
,
Flint
²
,
Balakrishnan
³

et al. 2017
Phys. Rev. Lett.
115
9
91
1
View full text Add to dashboard Cite