Article
Chemistry, Physical
Kamlesh V. Chandekar, S. P. Yadav
Summary: The phase analysis and average crystallite size of MFe2O4 (M=Co, Ni, Zn) nano-particles were analyzed using X-ray diffraction (XRD) patterns. The morphology of MFe2O4 (M=Co, Ni, Zn) was observed through High-Resolution Transmission electron microscopy (HRTEM). The magnetic properties of the prepared MFe2O4 (M=Co, Ni, Zn) nanostructures were studied using M-H analysis, Zero field-cooled (ZFC) and field-cooled (FC) spectra, and EPR spectroscopy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Kun'ichi Miyazawa, Takuro Nagai, Koji Kimoto, Masaru Yoshitake, Yumi Tanaka
Summary: The surface atomic structure of highly oriented pyrolytic graphite (HOPG) substrate exfoliated with adhesive tape was analyzed, revealing disordered and curved graphene layers on the exfoliated surface along with reactions with atmospheric water and oxygen molecules.
SURFACE AND INTERFACE ANALYSIS
(2021)
Article
Chemistry, Physical
Amalia Navarro, Elisa Garcia-Tabares, Quentin M. Ramasse, Pablo Cano, Ignacio Rey-Stolle, Beatriz Galiana
Summary: Integration of GaP layers on silicon substrates using AsH3 pre-exposure followed by a PH3-based GaP epitaxial growth allows the development of very promising processes for the photovoltaic industry. However, many of the growth routines using this approach suffer from reproducibility issues, leading to poor quality layers. This lack of knowledge on the mechanisms behind the formation of common planar defects and their dynamics hinders the successful transfer of the method to new epitaxial systems.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jakub Jurczyk, Katja Hoeflich, Katarzyna Madajska, Luisa Berger, Leo Brockhuis, Thomas Edward James Edwards, Czeslaw Kapusta, Iwona B. Szymanska, Ivo Utke
Summary: Gas-assisted focused electron-beam-induced deposition is a versatile tool for direct writing of complex-shaped nanostructures with unprecedented shape fidelity and resolution. The direct electron beam writing of silver is still in its early stage of development, and the potential precursors for focused electron-beam-induced deposition of silver are examined and compared in this study.
Article
Nanoscience & Nanotechnology
Elif Bilgilisoy, Jo-Chi Yu, Christian Preischl, Lisa McElwee-White, Hans-Peter Steinrueck, Hubertus Marbach
Summary: The precise deposition of nanoscaled structures is crucial for nanomaterial applications. This study successfully fabricated clean and well-defined Ru nanomaterials using highly focused electron beam-induced deposition. The study found that the deposition process competed with the electron-induced etching, resulting in lower Ru content initially. However, with increasing electron doses, the Ru content increased and the etching process became less pronounced. This research expands the possibilities of engineering nanostructured materials.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Kun'ichi Miyazawa, Makoto Asahara, Takeshi Miyasaka, Takuro Nagai, Koji Kimoto, Yumi Tanaka
Summary: The study investigated the surface structure of Ni plating films reacted with methane at 800 degrees C using SEM and TEM. The reaction with methane eroded the surface of the Ni plating film, resulting in a nano-roughened surface with a hexagonal close-packed structure of about 3 nm thickness. The carbon layer deposited on the Ni plating film was evaluated through electron energy loss spectroscopy, which showed an increase in hydrogenated or oxidized carbon atoms on the surface.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
B. Dhanalakshmi, G. M. Sravani, J. Suresh, P. V. S. S. S. N. Reddy, K. Eswara Rao, Sudhakar Jyothula, Chandra Sekhar Beera
Summary: Nanocrystalline powders of bismuth ferrite doped with manganese (BFMO) and bismuth ferrite doped with cobalt and manganese (BCoFMO) were synthesized using the sol-gel autocombustion technique. X-ray diffraction analysis revealed rhombohedral distortion in the perovskite phase of both samples. High resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDAX) were used to analyze the microstructure and elemental composition of the calcined powders, respectively. Scanning electron microscopy (SEM) was employed to investigate the microstructures of sintered BMFO and BCoFMO specimens at room temperature. Dielectric characteristics were studied and found to exhibit space charge polarization. Vibrating sample magnetometer (VSM) analysis indicated significantly increased saturation magnetization and coercivity in the BCoFMO sample compared to the other sample. The improved structural, dielectric, and magnetic properties of these doped systems suggest their potential applications in spintronics, multifunctional memories, sensors, and actuators.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Fabrizio Gaulandris, Luise Theil Kuhn, Jakob Birkedal Wagner, Simone Sanna, Soren Bredmose Simonsen
Summary: The oxidation states of cations in a perovskite structure have a significant impact on the conductivity of solid oxide electrochemical cells. Experimental studies on interfaces between LSC and YSZ reveal differences in the Co oxidation state at varying temperatures and atmospheric conditions, suggesting implications for high temperature operations in solid oxide fuel cells or electrolysis cells.
SOLID STATE IONICS
(2021)
Article
Microscopy
Janis Koester, Alexander Storm, Tatiana E. Gorelik, Michael J. Mohn, Fabian Port, Manuel R. Goncalves, Ute Kaiser
Summary: In this study, the signature of mono- and few-layer MoS2 and MoTe2 was systematically evaluated using TEM methods. The number of layers was determined by comparing the results of three TEM methods and discussing their strengths and limitations.
Article
Nanoscience & Nanotechnology
Felix Jungwirth, Fabrizio Porrati, Alfons G. Schuck, Michael Huth, Sven Barth
Summary: Two new precursors for focused electron beam-induced deposition (FEBID) of cobalt silicides have been synthesized, showing low sensitivity to changes in FEBID parameters and high growth rates. The deposits contain about 80% cleaved carbonyl ligands and exhibit temperature-dependent electrical properties, with magnetoresistance behavior indicative of tunneling magnetoresistance. Postgrowth irradiation treatment substantially reduces the observed magnetoresistance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
Ryosuke Senga, Yung-Chang Lin, Shigeyuki Morishita, Ryuichi Kato, Takatoshi Yamada, Masataka Hasegawa, Kazu Suenaga
Summary: This study demonstrates the unambiguous isotopic imaging of C-12 carbon atoms in C-13 graphene and the monitoring of their self-diffusion through atomic-level vibrational spectroscopy. The results confirm the high mobility of carbon atoms during growth and annealing via self-diffusion. This imaging technique provides a fundamental methodology for nanoisotope engineering and monitoring.
Article
Environmental Sciences
Wenxian Gou, Xinxin Mo, Chao Ren, Hongtao Wang, Wei Li
Summary: This research investigated the uptake mechanisms of Co, Ni, and Zn on gamma-Al2O3 at pH 7.5 using various analytical techniques. The study found that the formation of multimetallic layered double hydroxides (LDHs) was observed, and the shape and crystallinity of LDHs were correlated with the sorbed metal type and molar ratio. These findings have significant implications in heavy metal remediation and environmental risk assessment.
Article
Chemistry, Physical
Alexey Prosvetov, Alexey V. Verkhovtsev, Gennady Sushko, Andrey Solov'yov
Summary: This study investigates the growth of iron-containing nanostructures during focused electron beam-induced deposition (FEBID) using atomistic irradiation-driven molecular dynamics (IDMD) simulations. The simulations reveal that the morphology and elemental composition of the deposit vary significantly with increasing electron current. A low current leads to the formation of nanogranular structures with low metal content, while a higher current facilitates the coalescence of metal clusters into dendrite-like structures with higher metal content.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Applied
Ao Chen, Yuli He, Guokun Ma, Ziqi Zhang, Jie Ji, Jingshu Wan, Jianqiang Zhang, Houzhao Wan, Li Tao, Yiheng Rao, Liangpin Shen, Hanbin Wang, Jun Zhang, Yi Wang, Ting-Chang Chang, Peter A. van Aken, Hao Wang
Summary: This study demonstrates a high-performance ZrO2/NbOx threshold switching selector with low threshold voltage, ultra-high uniformity, and excellent voltage stability, optimizing performance through oxygen storage properties.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Alexander Kuprava, Michael Huth
Summary: Focused electron-beam-induced deposition (FEBID) is a versatile direct-write approach for 3D nanofabrication of functional materials. A new numerical simulation approach is described to study the influence of growth parameters on the shape of the 3D structures. The modular nature of the simulation method allows for future performance improvements using parallelization or graphics cards. Combining the simulation approach with beam-control pattern generation will optimize shape transfer for 3D FEBID.
Article
Materials Science, Multidisciplinary
J. J. Prias-Barragan, R. Gonzalez-Hernandez, F. A. Hoyos-Ariza, Juan Gabriel Ramirez, M. R. Ibarra, P. Prieto
Summary: This study investigates the role of hydroxyl and epoxy bridges in room-temperature ferromagnetism of pyrolytic graphene oxide nanoplatelets, demonstrating that decreased oxide coverage can enhance ferromagnetism. Various analyses were used to construct atomic models of graphene oxide structures, suggesting potential applications in spintronics for advanced sensors and devices.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Claire Donnelly, Aurelio Hierro-Rodriguez, Claas Abert, Katharina Witte, Luka Skoric, Dedalo Sanz-Hernandez, Simone Finizio, Fanfan Meng, Stephen McVitie, Jorg Raabe, Dieter Suess, Russell Cowburn, Amalio Fernandez-Pacheco
Summary: The design of complex magnetic systems through nonlinear interactions or three-dimensional geometries can achieve new functionalities by controlling intrastructure properties and magnetostatic coupling of neighboring magnetic structures. This can lead to new physics and functionalities, such as three-dimensional chiral spin states and spin textures with new spin topologies.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Miguel Gavara-Edo, Rosa Cordoba, Francisco Javier Valverde-Munoz, Javier Herrero-Martin, Jose Antonio Real, Eugenio Coronado
Summary: Hybrid devices based on spin-crossover/2D heterostructures provide a sensitive platform to detect spin transitions and tune the properties of 2D materials. However, the fragility of spin-crossover materials and the limitations of processing methods have restricted their applicability. This study presents an easily processable and robust hybrid device, where sublimable spin-crossover [Fe(Pyrz)(2)] molecules are deposited on chemical vapor deposition graphene. By growing an elusive polymorph of [Fe(Pyrz)(2)] on graphene, a fast and effective light-induced spin transition in the devices can be electrically detected.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Chia-Ping Su, Kari Ruotsalainen, Alessandro Nicolaou, Matteo Gatti, Alexandre Gloter
Summary: A real-space and reciprocal-space electron-energy-loss spectroscopy (EELS) investigation is performed on SVO bulk and nanostructures. It is found that a strong 1.35 eV excitation is attributed to a bulk plasmonic excitation from the 3d-t(2g) orbitals. Calculations done within a time-dependent density functional theory framework reveal the quantitative reproduction of this plasmon energy and dispersion.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Miguel Gavara-Edo, Francisco Javier Valverde-Munoz, Rosa Cordoba, M. Carmen Munoz, Javier Herrero-Martin, Jose Antonio Real, Eugenio Coronado
Summary: In this study, three new neutral Fe(II) SCO molecules belonging to the {Fe[H2B(pz)(2)](2)(L)} family were synthesized, and their crystallographic structure and magnetic properties were investigated. These compounds exhibited thermal- and light-induced SCO transitions with different degrees of cooperativity and effectiveness. Furthermore, two of the compounds were demonstrated to be sublimable, forming homogeneous thin films that retained the chemical integrity of the original molecules. SCO/2D horizontal hybrid devices based on CVD-graphene were successfully produced using these films, enabling the detection of the thermal SCO transition through the electric properties of CVD-graphene.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Qingxuan Jia, Alexandre Gloter
Summary: In this study, scanning transmission electron microscopy (STEM) and ab-initio calculation were used to estimate the atomic-scale and large-scale potential reconstruction at the interface between a metallic oxide SrRuO3 (SRO) thin film and an insulating DyScO3 (DSO) substrate. The results showed that the electric field extends more in the insulating DSO side, and the magnitude of the electrostatic drop at the interface was in accordance with the ab-initio values for a p-type reconstruction of the interface plane. Furthermore, atomically resolved potential asymmetry was observed at the SRO/DSO interface, revealing the balance evolution between antiferrodistortive and ferroelectric instabilities.
ADVANCED MATERIALS INTERFACES
(2023)
Editorial Material
Nanoscience & Nanotechnology
S. Ladak, A. Fernandez-Pacheco, P. Fischer
Article
Chemistry, Analytical
Alix Tatiana Escalante-Quiceno, Ondrej Novotny, Jan Neuman, Cesar Magen, Jose Maria De Teresa
Summary: High-resolution micro- and nanostructures can be grown using Focused Electron Beam Induced Deposition (FEBID), and it has been used to grow magnetic tips for Magnetic Force Microscopy (MFM). This study examines the durability of FEBID magnetic tips for MFM measurements and finds that they remain effective over a long period of time, with a maximum reduction of 60% in magnetic signal after 21 weeks of recurrent use and no significant contrast degradation after 30 weeks in storage.
Article
Nanoscience & Nanotechnology
Celine Lichtensteiger, Marios Hadjimichael, Edoardo Zatterin, Chia-Ping Su, Iaroslav Gaponenko, Ludovica Tovaglieri, Patrycja Paruch, Alexandre Gloter, Jean-Marc Triscone
Summary: We investigate the ferroelastic/ferroelectric domain structure in PbTiO3 epitaxially strained on (110)(o)-oriented DyScO3 substrates. The anisotropic strain created by the orthorhombic substrate results in an asymmetry in the domain configuration, with domain walls aligned along one of the two in-plane directions. The periodicity of the film thickness deviates from the Kittel law, and the domain configuration transitions from flux-closure to a/c-phase as the thickness increases, forming larger superdomains.
Article
Chemistry, Physical
Duo Jia Lee, Pei-Kai Hsu, Yi-Che Chen, Alexandre Gloter, Shih-Yun Chen
Summary: CeO2@C submicron core-shell structure was prepared with controlled ceria shell thickness and microstructure. The thin ceria shell formed by aggregating nanoparticles on the surface of the carbon sphere favored the formation of ferromagnetism. Surface and interface contributions to magnetism were observed through saturation magnetization measurements. The study also revealed the presence of sub-nanometric defect-rich areas doped with electrons on the surface, which were crucial for the magnetization of these mesoscopic systems.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Sergi Martin-Rio, Zorica Konstantinovic, Alberto Pomar, Lluis Balcells, Javier Pablo-Navarro, M. Ricardo Ibarra, Cesar Magen, Narcis Mestres, Carlos Frontera, Benjamin Martinez
Summary: Spin injection and spin-charge conversion processes were studied in all-oxide La(2/3)Sr(1/3)MnO(3)/SrIrO3 (LSMO/SIO) heterostructures with different SIO layer thickness and interfacial features. Spin pumping was used to generate pure spin currents in FM LSMO, and successful spin injection into the SIO layers was observed. However, the spin mixing conductance was lower compared to traditional Py/Pt or YIG/Pt systems. Interfaces were found to be structurally clean but with interdiffusion of atomic species near the interface. The low transversal ISHE voltage signals suggested the importance of interfacial features in controlling the spin injection process.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Aravind Raji, Guillaume Krieger, Nathalie Viart, Daniele Preziosi, Jean-Pascal Rueff, Alexandre Gloter
Summary: The structural and charge distribution of NdNiO2 thin films with and without charge ordering (CO) are studied. The capped samples show Ni1+ and have a stabilized infinite-layer structure, while the uncapped samples exhibit an increase in the o-o-p parameter, indicating the presence of Ni2+. The results suggest a possible link between charge ordering and oxygen re-intercalation in infinite-layer nickelate thin films.
Article
Materials Science, Multidisciplinary
Jose Maria De Teresa
Summary: This Perspective article evaluates the current state of research on the fabrication of nanoscale superconducting devices using focused electron and ion beams, and discusses their potential applications in quantum technologies.
MATERIALS FOR QUANTUM TECHNOLOGY
(2023)
