Article
Materials Science, Multidisciplinary
Dong Li, Bonan Zhu, Dirk Backes, Larissa S. I. Veiga, Tien-Lin Lee, Hongguang Wang, Qian He, Pinku Roy, Jiaye Zhang, Jueli Shi, Aiping Chen, Peter A. van Aken, Quanxi Jia, Sarnjeet S. Dhesi, David O. Scanlon, Kelvin H. L. Zhang, Weiwei Li
Summary: Research shows that strain engineering can effectively control the electronic structure, magnetic and transport properties of La0.9Ba0.1MnO3 thin films. By adjusting the strain, the orbital occupancy of Mn can be changed, leading to significant modulation of the magnetic and electronic properties.
Article
Chemistry, Multidisciplinary
Lijuan Qian, Shiyu Zhou, Kang Wang, Gang Xiao
Summary: The study reveals that in a one-dimensional half-metallic CrO2 nanoscale conductor, the magnetoresistance induced by a single magnetic domain wall is enhanced by 70 fold when the channel width decreases from 200 nm to 30 nm, due to the increased domain wall resistance and additional contribution of ballistic magnetoresistance. The research predicts that a simple CrO2 nanowire impregnated with a constriction at a 150 nm(2) cross-section could achieve a magnetoresistance ratio of 100%, far exceeding that of a conventional ferromagnetic nanowire.
Article
Chemistry, Multidisciplinary
Chunfang Wu, Congmian Zhen, Xiaozhe Zhang, Xiaoshan Xu, Jingtong Xie, Li Ma, Dewei Zhao, Denglu Hou
Summary: The metallic behavior in NiCo2O4 films is influenced by temperature and film thickness, with a 31-nm thick film showing the widest temperature window for metallic behavior. Films thinner than 31 nm exhibit quasi-two-dimensional behavior, affected by substrate clamping, while films thicker than 31 nm are three-dimensional with long-range structural order.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Tatsuya Yajima, Takuto Soma, Kohei Yoshimatsu, Nobuyuki Kurita, Masari Watanabe, Akira Ohtomo
Summary: The study on spinel-type LiV2O4 demonstrated the systematic variation of transport properties through structure modulation and electrochemical Li-ion intercalation. The heavy-fermion metallic behavior was observed to increase in resistivity with increasing electron filling in low doping regime, while a Mott transition was observed in high doping regime.
Article
Multidisciplinary Sciences
Hafedh Belmabrouk, Thamer Alharbi
Summary: This paper investigates the effects of Aluminum-doping on the micro-structural and dielectric properties of La0.7Sr0.25Na0.05Mn0.95Al0.05O3 ceramics. The X-ray diffraction analysis confirms the formation of a rhombohedral phase in the R3 space group. The complex impedance spectroscopic techniques reveal the contribution of two conducting phases, associated with grains and grain boundaries, in the Nyquist diagram.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Yanbin Chen, Chuzhong Zhang, Jiechao Jiang, Efstathios Meletis, Jialu Wu, Jing Ma, Ce-wen Nan, Chonglin Chen
Summary: Double-perovskite PrBaCo2O5.5+delta thin films were grown on (001) LaAlO3 substrates to study the processing dynamic-tuned epitaxial nature and physical properties under different oxygen contents. It was found that the microstructure and properties of the films were sensitive to oxygen content and the nature of the strained layer (SL) at the substrate-film interface. Manipulating the microstructure of perovskite complex oxides through different annealing environments and oxygen kinetics provides new insights into investigating multifunctional complex oxide systems.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Physics, Multidisciplinary
K. S. Sivaraj, S. Thoufeeq, M. R. Anantharaman
Summary: Yttrium Manganite, a multiferroic material, has potential applications in Ferroelectric Random Access Memories. By substituting Chromium, the electrical conductivity can be enhanced. The synthesized samples of different compositions were characterized and analyzed using X-ray diffraction, Scanning Electron Microscopy, impedance spectroscopy, and magnetic measurements. The results showed that Chromium substitution increased the electrical conductivity but diminished the ferroelectric properties.
Article
Chemistry, Multidisciplinary
Christopher Perez, Atharv Jog, Heungdong Kwon, Daniel Gall, Mehdi Asheghi, Suhas Kumar, Woosung Park, Kenneth E. Goodson
Summary: In this study, time-domain thermoreflectance was used to uncover cross-plane heat conduction mechanisms in high aspect ratio metal nanostructures. The findings demonstrate the existence of unexplored heat transport modes in nanostructured metals, which can be utilized to develop electro-thermal solutions for modern microelectronic devices and sensors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ji Qi, Yuan Zhang, Huan Liu, Hang Xu, Chen Wang, Linglong Hu, Ming Feng, Weiming Lu
Summary: In this study, the effects of strain on the oxygen evolution reaction (OER) performance were investigated using different types of strain. It was found that the strain exhibited different trends in rigid and flexible materials, which can be explained by the difference in oxygen activation energy in lattice fields.
Article
Nanoscience & Nanotechnology
Fuqiang Hua, Pengfei Lv, Min Hong, Sen Xie, Min Zhang, Cheng Zhang, Wei Wang, Zhaohui Wang, Yong Liu, Yonggao Yan, Shengjun Yuan, Wei Liu, Xinfeng Tang
Summary: This study visualizes the dominant native atomic defects in SnTe and clarifies an alternative optimization mechanism for the electronic transport properties through defect engineering. Increasing substrate temperature and adjusting the Te/Sn flux ratio during film growth can manipulate the hole density and carrier mobility in SnTe films, leading to an improved power factor. The findings contribute to a better understanding of the electronic transport properties in SnTe-based compounds.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Hongliang Chen, Chao Jin, Xiaoyu Song, Ping Wang, Long Chen, Haili Bai
Summary: The epitaxial La0.85Sr0.15MnO3 films on SrTiO3 substrate exhibit both antiferromagnetism and a metallic state below 40 K, with a spin-flop transition observed in the hysteresis loop. The large magnetoresistance around 100 K is attributed to spin scattering at phase boundaries between the ferromagnetic and antiferromagnetic phases. This work contributes to the understanding of magnetic coupling and magneto-transport properties in lightly doped manganite films.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Laima Trinkler, Dajin Dai, Liuwen Chang, Mitch Ming-Chi Chou, Tzu-Ying Wu, Jevgenijs Gabrusenoks, Dace Nilova, Rihards Ruska, Baiba Berzina, Ramunas Nedzinskas
Summary: The luminescent properties of epitaxial Cu2O thin films were compared with Cu2O single crystals in the temperature range of 10-300 K. The thin films were deposited epitaxially on Cu or Ag substrates with different processing parameters. The luminescence spectra of the thin films showed emission bands corresponding to V-O(2+), V-O(+), and V-Cu defects at approximately 720, 810, and 910 nm, respectively. Additionally, there were unidentified emission bands observed around 650-680 nm.
Article
Nanoscience & Nanotechnology
Andrew C. Lang, D. Scott Katzer, Neeraj Nepal, David J. Meyer, Rhonda M. Stroud
Summary: Epitaxial transition metal nitrides (TMNs) are a new class of crystalline thin film metals that can be integrated with common group III-nitride semiconductors. This study used high-resolution transmission electron microscopy to identify different phases of tantalum nitrides with N-sublattice ordering, revealing Ta-deficient films with specific planar defects. These findings lay the foundation for the application of this epitaxial TMN material in new electronic and superconducting device structures.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Multidisciplinary
Yun-Qi Zhao, Heng Zhang, Xiang-Bin Cai, Wei Guo, Dian-Xiang Ji, Ting-Ting Zhang, Zheng-Bin Gu, Jian Zhou, Ye Zhu, Yue-Feng Nie
Summary: In this study, Ba2IrO4 epitaxial films were synthesized by reactive molecular beam epitaxy and exhibited enhanced conductivity under biaxial compressive strain, consistent with first-principles calculations predicting band gap narrowing and stronger orbital hybridization. High resolution scanning transmission electron microscopy and X-ray diffraction confirmed the high quality of the films with partial strain relaxation.
Article
Materials Science, Multidisciplinary
F. Macia, M. Mirjolet, J. Fontcuberta
Summary: Spin pumping across interfaces between metallic SrVO3 and ferromagnetic Ni80Fe20 is reported. The data shows an efficient spin pumping process, with a significantly higher spin mixing conductance value compared to metallic Vanadium and isoelectronic VO2. The results can be rationalized in terms of the density of states at the Fermi level and the relative strength of electron-electron correlations and electron-lattice coupling.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Review
Physics, Applied
Ilaria Bergenti
Summary: Due to their flexibility and processability, molecular ferroelectric materials have emerged as complements to traditional ferroelectric perovskite oxides. However, the uniaxial nature of most compounds limits their potential in thin film applications. A possible solution is the use of multiaxial molecular compounds or low-dimensional systems.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Patrizio Graziosi, Zhen Li, Neophytos Neophytou
Summary: Research has found that strong transport asymmetries between the conduction and valence bands can allow low bandgap thermoelectric materials to achieve high phonon-limited electronic conductivity at finite Seebeck coefficient values, leading to significantly enhanced power factors. This study can guide machine learning studies in identifying materials with extraordinary power factors.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Antonino Mazzaglia, Giuseppe Di Natale, Rita Tosto, Angela Scala, Giuseppe Sortino, Anna Piperno, Maria Pia Casaletto, Alberto Riminucci, Maria Laura Giuffrida, Placido G. Mineo, Valentina Villari, Norberto Micali, Giuseppe Pappalardo
Summary: The study demonstrates that KLVFF-decorated nanomagnets show good selectivity for extracting AB (1-42) peptide effectively from aqueous samples. The nanoassemblies exhibit stable size and surface properties in aqueous dispersion. These nanohybrids have potential applications as diagnostic tools.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Mattia Benini, Giuseppe Allodi, Alessandro Surpi, Alberto Riminucci, Ko-Wei Lin, Samuele Sanna, Valentin Alek Dediu, Ilaria Bergenti
Summary: The hybridization of surface orbitals with molecular orbitals in thin ferromagnetic layers can modify the key magnetic parameters. This study investigates the effects of surface hybridization on magnetic properties and reveals the reconstruction of magnetic environment at the cobalt surface in polycrystalline films.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Computer Science, Interdisciplinary Applications
Patrizio Graziosi, Zhen Li, Neophytos Neophytou
Summary: This paper introduces ElecTra, an open-source code which computes various electronic and thermoelectric transport coefficients for semiconductor materials. The code considers the complex electronic structure and includes scattering parameters such as acoustic and optical phonons, ionized dopants, and alloy scattering. ElecTra is validated against analytical solutions, existing codes, and experimentally well-assessed materials.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Melania Maglio, Maria Sartori, Alessandro Gambardella, Tatiana Shelyakova, Valentin Alek Dediu, Matteo Santin, Yolanda Pineiro, Manuel Banobre Lopez, Jose Rivas, Anna Tampieri, Simone Sprio, Lucia Martini, Alessandro Gatti, Alessandro Russo, Gianluca Giavaresi, Milena Fini
Summary: The use of functionalized scaffolds incorporated with superparamagnetic nanoparticles and vascular endothelial growth factor (VEGF) injection into a magnetic scaffold resulted in increased bone regeneration in a large bone defect in sheep metatarsus. The magnetic field generated by implanted magnets allowed the capture of the injected nanoparticles, forming a VEGF gradient in the scaffold's porosity. Histomorphometric measurements showed improved bone growth and bone-to-implant contact, while atomic force microscopy (AFM) analysis revealed similar nanomechanical behavior of the regenerated tissue to the magnetic field distribution. This study demonstrates the potential of magnetic technologies combined with functionalized scaffolds to enhance bone formation and improve bone/scaffold interaction.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Multidisciplinary Sciences
Fabio Orlandi, Davide Delmonte, Gianluca Calestani, Enrico Cavalli, Edmondo Gilioli, Vladimir V. Shvartsman, Patrizio Graziosi, Stefano Rampino, Giulia Spaggiari, Chao Liu, Wei Ren, Silvia Picozzi, Massimo Solzi, Michele Casappa, Francesco Mezzadri
Summary: This study reports a previously unrecognized room temperature multiferroic material, BaFe2O4. Experimental results demonstrate its polar crystal structure and antiferromagnetic behavior, and the polarization is switchable as observed through piezo force microscopy and electrical measurements. The findings are of great significance for the discovery and application of new multiferroic materials.
NATURE COMMUNICATIONS
(2022)
Article
Polymer Science
Marco Bontempi, Rosario Capozza, Andrea Visani, Milena Fini, Gianluca Giavaresi, Alessandro Gambardella
Summary: In this study, the near-surface elasticity of semicrystalline polyether ether ketone (PEEK) at room temperature was quantitatively mapped using a standard atomic force microscopy setup in nanoindentation mode. Two localized moduli distributions were observed at approximately 0.6 and 0.9 GPa below the plastic threshold of the polymer, at indentation loads ranging from 120-450 nN. The localization of the amorphous and crystalline phases on the free surface of the polymer was detected with unprecedented detail. This study provides insights into quantitatively characterizing complex biopolymer systems on the nanoscale and guiding the optimal design of micro- and nanostructures for advanced biomedical applications.
Article
Crystallography
Zhen Li, Patrizio Graziosi, Neophytos Neophytou
Summary: This study calculates the mobility of SnO2, an extensively studied transparent oxide n-type semiconductor, considering electron-phonon and ionized impurity scattering. The results suggest that polar optical phonon scattering is the main factor determining the mobility of both electrons and holes at room temperature.
Article
Orthopedics
Alessandro Russo, Alessandro Gatti, Silvia Felici, Alessandro Gambardella, Milena Fini, Maria Pia Neri, Stefano Zaffagnini, Tiziana Lazzarotto
Summary: Pulse lavage is the standard treatment for bacterial biofilm removal but has limited effectiveness. This study found that a piezoelectric ultrasonic scalpel is more efficient in removing biofilm from orthopedic implants compared to pulse lavage. Therefore, the use of a piezoelectric ultrasonic scalpel can potentially improve the success rate of infection treatment.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2023)
Article
Pharmacology & Pharmacy
Francesca Silingardi, Stefania Pagani, Alessandro Gambardella, Gianluca Giavaresi, Adriana Bigi, Elisa Boanini
Summary: Curcumin can be combined with calcium phosphates to develop materials with anti-oxidant properties and beneficial effects on bone tissue. At low concentrations, curcumin inhibits osteoclast growth while supporting the growth and colonization of osteoblasts.
Review
Engineering, Electrical & Electronic
Patrizio Graziosi, Neophytos Neophytou
Summary: The large variety of complex electronic structure materials and their alloys offer promising directions for improvements in thermoelectric power factors. The shape complexity of the electronic structure energy surfaces alone can offer advantages to the power factor, but the presence of anisotropic scattering mechanisms can reduce these improvements. Simple mass ratios and the number of valleys can capture the anisotropy shape well.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Patrizio Graziosi, Ilaria Bergenti, Lorenzo Vistoli, Fabio Galassi, Marco Calbucci, Alberto Riminucci, Francesco Borgatti, Donald A. MacLaren, Kerry J. O'Shea, Giovanni Vinai, Piero Torelli, Giancarlo Panaccione, Viktor Kabanov, Valentin Alek Dediu
Summary: In this paper, the capability to establish spin-polarized currents in doped SrTiO3 (STO) is demonstrated. The study is based on the investigation of charge and spin transport in STO layers doped by the reversible electromigration of oxygen atoms. The results show that the metallic conductivity observed at temperatures <200-250 K corresponds to the thermodynamically doped STO with bad metal behavior, making it a valuable candidate for innovative spintronic devices.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Ilaria Bergenti, Takeshi Kamiya, Dongzhe Li, Alberto Riminucci, Patrizio Graziosi, Donald A. MacLaren, Rajib K. Rakshit, Manju Singh, Mattia Benini, Hirokazu Tada, Alexander Smogunov, Valentin A. Dediu
Summary: Orbital hybridization at the Co/C-60 interface strongly enhances the magnetic anisotropy of the cobalt layer, while also affecting its ability to support spin-polarized currents and inducing a spin-filtering effect.
ACS APPLIED ELECTRONIC MATERIALS
(2022)