Electromagnetic Functionalization of Wide‐Bandgap Dielectric Oxides by Boron Interstitial Doping

Park, Dae-Sung; Rees, Gregory J.; Wang, Haiyuan; Rata, Diana; Morris, Andrew J.; Maznichenko, I. V.; Ostanin, S.; Bhatnagar, Akash; Choi, Chel‐Jong; Jónsson, Ragnar; Kaufmann, Kai; Kashtiban, Reza J.; Walker, Marc; Chiang, Cheng‐Tien; Thorsteinsson, Einar B.; Luo, Zheng‐Dong; Park, In Sung; Hanna, John V.; Mertig, Ingrid; Dörr, K.; Gíslason, H. P.; McConville, Christopher F

doi:10.1002/adma.201802025

Cited by 7 publications

(19 citation statements)

References 47 publications

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“…Versatile, but intriguing electronic and magnetic phenomena, such as two-dimensional high-mobility electron gas 1 , 2 , magnetoelectricity 3 , 4 , chiral magnetic domains 5 , 6 and topological phenomena 7 , 8 , have all been observed in various strongly correlated complex oxide systems with tunable magnetoelectric properties. These physical systems have significant potential in spin-based energy applications, such as low-energy consumption electronics.…”

Section: Introductionmentioning

confidence: 99%

The emergence of magnetic ordering at complex oxide interfaces tuned by defects

et al. 2020

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Complex oxides show extreme sensitivity to structural distortions and defects, and the intricate balance of competing interactions which emerge at atomically defined interfaces may give rise to unexpected physics. In the interfaces of non-magnetic complex oxides, one of the most intriguing properties is the emergence of magnetism which is sensitive to chemical defects. Particularly, it is unclear which defects are responsible for the emergent magnetic interfaces. Here, we show direct and clear experimental evidence, supported by theoretical explanation, that the B-site cation stoichiometry is crucial for the creation and control of magnetism at the interface between non-magnetic ABO 3-perovskite oxides, LaAlO 3 and SrTiO 3. We find that consecutive defect formation, driven by atomic charge compensation, establishes the formation of robust perpendicular magnetic moments at the interface. Our observations propose a route to tune these emerging magnetoelectric structures, which are strongly coupled at the polar-nonpolar complex oxide interfaces.

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Section: Introductionmentioning

confidence: 99%

The emergence of magnetic ordering at complex oxide interfaces tuned by defects

et al. 2020

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“…This study demonstrates that, in addition to conventional techniques, an innovative combination of high-resolution 11 B solid-state magic-angle-spinning nuclear magnetic resonance spectroscopy (MAS NMR) − and broadline 105 Pd solid-state static NMR, synchrotron X-ray powder diffraction (SXRD), aberration-corrected scanning transmission electron microscopy-annular dark-field (STEM-ADF) imaging, in situ X-ray pair distribution function (XPDF), electron energy loss spectroscopy (EELS), and electron ptychography can be used to characterize the Pd- int B/C NPs system. This industrial-type powder catalyst was chosen as a case study for the investigation of Pd host unit cell structural modification and B atom location.…”

Section: Introductionmentioning

confidence: 99%

Interstitial Boron Atoms in the Palladium Lattice of an Industrial Type of Nanocatalyst: Properties and Structural Modifications

et al. 2019

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It is well established that the inclusion of small atomic species such as boron (B) in powder metal catalysts can subtly modify catalytic properties, and the associated changes in the metal lattice implies that the B atoms are located in the interstitial sites. However, there is no compelling evidence for the occurrence of interstitial B atoms, and there is a concomitant lack of detailed structural information describing the nature of this occupancy and its effects on the metal host. In this work, we use an innovative combination of high-resolution 11 B magic-angle-spinning (MAS) and 105 Pd static solid state NMR nuclear magnetic resonance (NMR), synchrotron X-ray diffraction (SXRD), in-situ X-ray pair distribution function (XPDF), scanning transmission electron microscopy-annular dark field imaging (STEM-ADF), electron ptychography and electron energy loss spectroscopy (EELS) to investigate the B atom positions, properties and structural modifications to the palladium lattice of an industrial type interstitial boron doped palladium nanoparticle catalyst system (Pdint B/C NPs). In this study we report that upon B incorporation into the Pd lattice, the overall face centered cubic (FCC) lattice is maintained, however short range disorder is introduced. The 105 Pd static solid-state NMR illustrates how different types (and levels) of structural strain and disorder are introduced in the nanoparticle history. These structural distortions can lead to the appearance of small amounts of local hexagonal close packed (HCP) structured material in localized regions. The short range lattice tailoring of the Pd framework to accommodate interstitial B dopants in the octahedral sites of the distorted FCC structure can be imaged by electron ptychography. This study describes new toolsets that enables the characterization of industrial metal nanocatalysts across length scales from macro-analysis to micro-analysis, which gives important guidance to structure-activity relationship of the system.

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“…In the upper 3D nanocomposite film layer, the two vertically aligned LAO and LBO structures are tightly coupled through the vertical interfaces. We found that the lattice match between LAO and LBO phases occur via aligning the LAO [29,30] Consequently, our results directly show that the consecutive formation of coherent 2D film layer and vertically arrayed 3D film is spontaneously formed in the LABO/STO(001) heterostructures (Figure 2g).…”

Section: Growth Mechanism Of Self-assembled 2d-3d Labo Nanocomposite ...mentioning

confidence: 65%

Controlled Electronic and Magnetic Landscape in Self‐Assembled Complex Oxide Heterostructures

et al. 2023

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Complex oxide heterointerfaces contain a rich playground of novel physical properties and functionalities, which give rise to emerging technologies. Among designing and controlling the functional properties of complex oxide film heterostructures, vertically aligned nanostructure (VAN) films using a self‐assembling bottom‐up deposition method presents great promise in terms of structural flexibility and property tunability. Here, the bottom‐up self‐assembly is extended to a new approach using a mixture containing a 2Dlayer‐by‐layer film growth, followed by a 3D VAN film growth. In this work, the two‐phase nanocomposite thin films are based on LaAlO3:LaBO3, grown on a lattice‐mismatched SrTiO3001 (001) single crystal. The 2D‐to‐3D transient structural assembly is primarily controlled by the composition ratio, leading to the coexistence of multiple interfacial properties, 2D electron gas, and magnetic anisotropy. This approach provides multidimensional film heterostructures which enrich the emergent phenomena for multifunctional applications.

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Electromagnetic Functionalization of Wide‐Bandgap Dielectric Oxides by Boron Interstitial Doping

Cited by 7 publications

References 47 publications

The emergence of magnetic ordering at complex oxide interfaces tuned by defects

The emergence of magnetic ordering at complex oxide interfaces tuned by defects

Interstitial Boron Atoms in the Palladium Lattice of an Industrial Type of Nanocatalyst: Properties and Structural Modifications

Controlled Electronic and Magnetic Landscape in Self‐Assembled Complex Oxide Heterostructures

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