Electron Leakage and Double-Exchange Ferromagnetism at the Interface between a Metal and an Antiferromagnetic Insulator:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CaRuO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>CaMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Nanda, B. R. K.; Satpathy, S.; Springborg, Michael

doi:10.1103/physrevlett.98.216804

Cited by 60 publications

(57 citation statements)

References 25 publications

(26 reference statements)

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“…4 Thereafter, density-functional theory calculations and spectroscopic studies revealed that a small leakage of itinerant electrons from the CRO can induce weak FM via the doubleexchange (DE) in a few interfacial unit-cells of CMO. 5,6 The interfacial FM was also confirmed by the observed EB in CMO/CRO SLs. 7 On the other hand, the stacking of La 0.67 Sr 0.33 MnO 3 (LSMO) and SrRuO 3 (SRO), both are ferromagnetic-metal at low temperature (T), may constitute another interesting example of the system, 8 which is characterized by an AF interlayer coupling.…”

supporting

confidence: 53%

“…23,26,27 As the ultrathin LCMO was sandwiched between CRO layers, the charge transfer from CRO layer into the interfacial LCMO was supposed to take place. [4][5][6][7][8] The supplied mobile carriers in the interfacial region would facilitate the DE, thus depressing the nucleation of the AF phase or the tendency to EPS. Such a scenario is analogous to the case for CRO/CMO SLs, where the metallic CRO also acts as a donator and the mobile electrons leaked into the CMO can induce an interfacial canted FM via the DE.…”

mentioning

confidence: 99%

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Contrasting size-scaling behavior of ferromagnetism in La0.67Ca0.33MnO3 films and La0.67Ca0.33MnO3/CaRuO3 multilayers

Chen

et al. 2014

Applied Physics Letters

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Using La0.67Ca0.33MnO3 (LCMO) and CaRuO3 (CRO) as components, the single-layer films, bilayers, trilayers, and superlattices were fabricated on NdGaO3 (110) substrates. These epitaxial structures show quite different Curie temperature (TC) depending on the LCMO layer thickness (x), especially in the low x region. For LCMO films, TC dramatically decreases with x and disappears below 3.2 nm, as previously reported. For LCMO/CRO (CRO/LCMO) bilayers, however, a smooth decline of TC was observed, retaining a TC near 50 K at 1.6 nm. More strikingly, for the multilayers with LCMO sandwiched between CRO, TC is stabilized at ∼250 K even at x of 1.6 nm, before decreasing to 200 K at 0.8 nm. We ascribed these distinct behaviors to the LCMO/CRO interfaces, and a possible charge transfer from CRO to LCMO was suggested to play a vital role in stabilizing the ferromagnetism in ultrathin LCMO. This finding would shed some lights on the dead layer formation in ultrathin manganites and be significant in improving the performance of the related spintronic devices.

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supporting

confidence: 53%

mentioning

confidence: 99%

Contrasting size-scaling behavior of ferromagnetism in La0.67Ca0.33MnO3 films and La0.67Ca0.33MnO3/CaRuO3 multilayers

Chen

et al. 2014

Applied Physics Letters

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“…1). This scenario was supported by density functional calculations 16 and by a detailed spectroscopic study 17 . However, the magnetization profile determined by reflectometry with circularly polarized x-rays 17 revealed that the ferromagnetic magnetization penetrates more deeply into the CaMnO 3 layers than predicted by the ab-initio theory, possibly as a consequence of the formation of magnetic polarons that have also been invoked to explain experiments on bulk doped CaMnO 3 .…”

Section: Introductionmentioning

confidence: 60%

Far-infrared and dc magnetotransport of CaMnO3-CaRuO3superlattices

et al. 2011

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We report temperature and magnetic field dependent measurements of the dc resistivity and the far-infrared reflectivity (photon energies ω = 50 − 700 cm −1 ) of superlattices comprising 10 consecutive unit cells of the antiferromagnetic insulator CaMnO3, and 4 -10 unit cells of the correlated paramagnetic metal CaRuO3. Below the Néel temperature of CaMnO3, the dc resistivity exhibits a logarithmic divergence upon cooling, which is associated with a large negative, isotropic magnetoresistance. The ω → 0 extrapolation of the resistivity extracted from the FIR reflectivity, on the other hand, shows a much weaker temperature and field dependence. We attribute this behavior to scattering of itinerant charge carriers in CaRuO3 from sparse, spatially isolated magnetic defects at the CaMnO3-CaRuO3 interfaces. This field-tunable "transport bottleneck" effect may prove useful for functional metal-oxide devices.

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“…At oxide interfaces, charge transfer can be driven by a difference in chemical potential or by screening of local dipoles. Charge transfer can alter the B -site valence states near the interface, enabling magnetic order that is distinct from either constituent, for instance leading to ferromagnetism confined to the interface between two insulating antiferromagnets [Salvador et al ., 1999; Lin et al ., 2006; Santos et al ., 2011] or ferromagnetism from a paramagnetic metal and antiferromagnetic insulator [Takahashi et al ., 2001; Nanda et al ., 2007; Freeland et al ., 2010; He et al ., 2012]. The spatial extent of the interfacial magnetism closely matches that of the charge transfer length scale, which is generally quite short, around 0.4 nm to 2 nm [Santos et al ., 2011; Grutter et al ., 2013; Hoffman et al ., 2013], owing to both the large dielectric constant and significant carrier concentration (charge density) that complex oxides often support [Ahn et al ., 2006].…”

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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Electron Leakage and Double-Exchange Ferromagnetism at the Interface between a Metal and an Antiferromagnetic Insulator:CaRuO3/CaMnO3

Cited by 60 publications

References 25 publications

Contrasting size-scaling behavior of ferromagnetism in La0.67Ca0.33MnO3 films and La0.67Ca0.33MnO3/CaRuO3 multilayers

Contrasting size-scaling behavior of ferromagnetism in La0.67Ca0.33MnO3 films and La0.67Ca0.33MnO3/CaRuO3 multilayers

Far-infrared and dc magnetotransport of CaMnO3-CaRuO3superlattices

Interface-induced phenomena in magnetism

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