Article
Materials Science, Ceramics
Songhak Yoon, Wenjie Xie, Xingxing Xiao, Stefano Checchia, Mauro Coduri, Peter Schuetzenduebe, Marc Widenmeyer, Stefan G. Ebbinghaus, Benjamin Balke, Anke Weidenkaff, Gisela Schuetz, Kwanghyo Son
Summary: Magnetic properties of perovskite titanates ATiO(3-& delta;) (A = Ca, Sr, Ba) were investigated before and after arc melting. Crystal structure analysis and quantitative chemical element analysis were performed. The magnetic properties were found to be influenced by impurities of 3d elements and the occupation of magnetic ions varied depending on the composition and crystal structure. Furthermore, the formation of oxygen vacancies and reduction of Ti4+ to Ti3+ were also observed during arc melting.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Weon Cheol Lim, Jitendra Pal Singh, Younghak Kim, Jonghan Song, Keun Hwa Chae, Tae-Yeon Seong
Summary: The study shows that thermal annealing significantly affects the properties of zinc oxide thin films, including relaxation of stress, variation in optical band-gap, and occurrence of vacancies and defects. These changes are revealed through X-ray techniques, providing a better understanding of the performance changes in zinc oxide films.
Article
Chemistry, Applied
Yanqiu Ma, Jingnan Zang, Mingmin Qing, Yulin Xiao, Huajiang Zhang, Yujie Chi, Yuan Chi
Summary: The glycosylation of egg white proteins with maltodextrin was studied. The glycosylated egg white proteins showed improved gel properties, such as increased hardness, water holding capacity, rheological parameters, and finer gel microstructures. The protein structures were unfolded due to glycosylation, as observed by changes in content of exposed sulfhydryl group and β-sheet, decreased crystallinity, thermal denaturation temperature, and enthalpy. The study provides insights into glycosylation mechanism and a convenient approach to improve the gel properties of egg white proteins.
Article
Chemistry, Applied
Yanqiu Ma, Jingnan Zang, Mingmin Qing, Yulin Xiao, Huajiang Zhang, Yujie Chi, Yuan Chi
Summary: The glycosylation of egg white proteins with maltodextrin was studied and the resulting glycosylated proteins showed improved gel properties such as increased hardness, water holding capacity, rheological parameters, and finer microstructures. The protein structures were unfolded due to extended glycosylation, as evidenced by increased exposed sulfhydryl groups and beta-sheet content, decreased crystallinity, thermal denaturation temperature, and enthalpy. The gel properties were correlated with the structural changes. Overall, this study provides insights into the mechanism of glycosylation and offers a convenient approach to enhance the gel properties of egg white proteins in the food industry.
Article
Nanoscience & Nanotechnology
Xiao Chi, Rui Guo, Juxia Xiong, Lizhu Ren, Xinwen Peng, Beng Kang Tay, Jingsheng Chen
Summary: The study demonstrates a significant ferroelectric modulation of TMR in ferroelectric/magnetic MTJs, highlighting the interface electronic and magnetic reconstructions driven by ferroelectric polarization switching. This robust coupling between BTO and LSMO at the interface results in a giant electrical modulation of TMR, shedding new light on the intrinsic mechanisms governing magnetoelectric coupling for spin control in spintronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Gerrit van der Laan
Summary: The article discusses the origin of non-zero XMCD signals in a threefold symmetric kagome lattice with negative spin chirality, emphasizing the rotational symmetry invariance and anisotropy of the XMCD signal. The study also shows that the angular dependence of XMCD signals exhibits unusual behavior and the determination of spin direction requires consideration of atomic orientation.
Article
Physics, Applied
Parul Rani, Petra E. Joensson, Sagar Ghorai, Alpha T. N'Diaye, Gabriella Andersson
Summary: The saturation magnetization, coercivity, and uniaxial in-plane anisotropy constant in amorphous bilayers and multilayers of Co-85(Al70Zr30)(15) and Sm11Co82Ti7 can be tuned by adjusting the interface density. Increasing the number of bilayer repetitions from 1 to 10 results in a fourfold increase in the coercivity and anisotropy constant, while the saturation magnetization slightly decreases. The Co and Sm moments are ferromagnetically coupled in all samples.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Giulia Avvisati, Pierluigi Gargiani, Carlo Mariani, Maria Grazia Betti
Summary: By tuning the occupancy of molecular orbitals carrying the spin magnetic moment through electron doping, the magnetic response of molecular spin interfaces can be controlled. Alkali doping induces a transition in the spin state of Mn centers, resulting in higher saturation magnetization values and allowing the molecular spin configuration to be adjusted almost independently from the hard-magnet substrate.
Article
Materials Science, Multidisciplinary
S. Jena, R. Dawn, W. -Y. Choi, Y. Singh, A. Ghosh, S. K. Sahoo, M. H. Jung, J. Gardner, V. K. Verma, K. Amemiya, V. R. Singh
Summary: Polycrystalline MnSi is a highly efficient magnetic skyrmionic material that shows long-range ferromagnetic ordering. Researchers studied the film using various techniques and found that it has high magnetization and interesting spin textures.
Article
Physics, Multidisciplinary
Maryam Sajedi, Chen Luo, Konrad Siemensmeyer, Maxim Krivenkov, Kai Chen, James M. Taylor, Marion A. Flatken, Florin Radu, Oliver Rader
Summary: Lead halide perovskites are new key materials with various applications. Recent reports suggest that doping with Mn can lead to ferromagnetism, but our study shows that significant double exchange and ferromagnetism do not occur in Mn-doped lead halide perovskite thin films. Our results indicate that Mn is not suitable for creating ferromagnetism in lead halide perovskites.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Keshav Kumar, Shrawan Kumar Mishra, Sanjay Singh, Ivan Baev, Michael Martins, Fabio Orlandi, Pascal Manuel, Dhananjai Pandey
Summary: Investigations into the magnetic ground state of BaFe12O19 (BFO) using X-ray absorption spectra (XAS), X-ray magnetic circular dichroism (XMCD), and neutron diffraction at 1.2 and 1.5 K, revealed a conical-type magnetic structure. This observation opens up the possibility of type-II multiferroicity in undoped BFO.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Physics, Applied
Samer Kurdi, Yuya Sakuraba, Keisuke Masuda, Hiroo Tajiri, Bhaskaran Nair, Guillaume F. Nataf, Mary E. Vickers, Guenter Reiss, Markus Meinert, Sarnjeet S. Dhesi, Massimo Ghidini, Zoe H. Barber
Summary: In this study, the effect of anti-site disorder on the half-metallic properties of a Mn2FeAl Heusler alloy thin film was investigated. The film was grown on TiN-buffered MgO 001 substrates via magnetron sputtering. It was found that the formation of a partially disordered L2(1) B structure due to anti-site disorder led to the deviation from half-metallic behavior.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Fangfang Pei, Jingjing Yu, Jiayuan Zhou, Siyu Wang, Daxiang Liu, Yanan Yuan, Lei Xi, Feng Jin, Xucai Kan, Chao Wang, Lingfei Wang, Wensheng Yan, Yizheng Wu, Shouguo Wang, Kai Chen, Tianping Ma, Xue Liu, Mengmeng Yang, Qian Li
Summary: This study systematically investigates the magnetic phase transition in CrSBr and reveals the significantly different Curie temperature between the surface and bulk. The electronic state and magnetism of CrSBr are also identified. These findings enrich our understanding of CrSBr and highlight its potential as a building block for future spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Weijin Chen, Qingdong Yang, Yuntian Chen, Wei Liu
Summary: Chiral optical effects are typically quantified along specific incident directions or as direction-independent properties by averaging responses among all structure orientations. However, the extremization of chirality with respect to incident directions or structure orientations has not been systematically explored. This study examines chiral responses of open photonic structures using quasinormal modes and polarization singularities, revealing the ideal maximization and minimization of optical chiralities for circular and linear polarizations, respectively, when plane waves are incident in certain directions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Abhishek Sarkar, Benedikt Eggert, Ralf Witte, Johanna Lill, Leonardo Velasco, Qingsong Wang, Janhavika Sonar, Katharina Ollefs, Subramshu S. Bhattacharya, Richard A. Brand, Heiko Wende, Frank M. F. de Groot, Oliver Clemens, Horst Hahn, Robert Kruk
Summary: High entropy oxides (HEOs) are a type of functional materials composed of multiple principal cations. This study investigates the cation occupation in spinel HEOs and finds a significant deviation from the previous assumptions. The results have direct correlations with the magnetic properties and provide an alternative viewpoint on ionic arrangement in HEOs, which is of fundamental interest for predicting and designing their structure-dependent functionalities.
Article
Chemistry, Physical
Nadejda Bouldi, Matteo Mannini, Marius Retegan, Reece G. Miller, Benjamin Cahier, Philippe Sainctavit, Nathalie Guihery, Talal Mallah, Delphine Cabaret, Diane Gouere, Francois Baudelet, Lucie Nataf, Fabrice Wilhelm, Francois Guillou, Andrei Rogalev, Nicolas Suaud, Sally Brooker, Amelie Juhin
Summary: The spin crossover transition in two molecular Co2+bis-imide compounds, Co(dpzca)2 and Co(pypzca)2, was investigated. While both compounds have similar crystal structures, they exhibit different temperature-dependent magnetic behaviors. The study reveals that Co(pypzca)2 undergoes a reversible pressure-induced SCO transition, while Co(dpzca)2 undergoes a temperature-induced SCO transition. The differences in the SCO transitions are likely due to different intermolecular interactions between the two compounds.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Giulia Serrano, Lorenzo Poggini, Giuseppe Cucinotta, Andrea Luigi Sorrentino, Niccolo Giaconi, Brunetto Cortigiani, Danilo Longo, Edwige Otero, Philippe Sainctavit, Andrea Caneschi, Matteo Mannini, Roberta Sessoli
Summary: This study reveals the potential of magnetic molecules for sensing local magnetic field variations in molecular/superconductor hybrid devices, including spin resonators or spin injecting and spin filtering components for spintronics applications.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Felix Houard, Guiseppe Cucinotta, Thierry Guizouarn, Yan Suffren, Guillaume Calvez, Carole Daiguebonne, Olivier Guillou, Franck Artzner, Matteo Mannini, Kevin Bernot
Summary: This study demonstrates the assembly and transfer of single-chain magnets (SCMs) in the gel phase. SCMs based on Tb-III ions and nitronyl-nitroxides radicals with short alkyl chains can form crystalline supramolecular nanotubes interacting with heptane to create a robust gel. The gel is composed of supramolecular nanotubes, as confirmed by small-angle X-ray scattering, and exhibits SCM behavior in magnetism. Gelation on the surface allows for the deposition of supramolecular nanotubes as thick films or sub-monolayers.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Alessandro Chiesa, Alberto Privitera, Emilio Macaluso, Matteo Mannini, Robert Bittl, Ron Naaman, Michael R. Wasielewski, Roberta Sessoli, Stefano Carretta
Summary: Molecular spins are potential building blocks for future quantum technologies due to the flexibility provided by chemistry. However, their weak interaction with external stimuli makes it difficult to access their state at the single-molecule level. A solution using the chirality-induced spin selectivity effect on electron transfer processes is envisioned, which enables initialization, manipulation, and single-spin readout of molecular qubits and qudits even at relatively high temperatures.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Nicolo Maccaferri, Alessio Gabbani, Francesco Pineider, Terunori Kaihara, Tlek Tapani, Paolo Vavassori
Summary: Plasmonics offers a unique method to confine and enhance electromagnetic radiation below the diffraction limit, with potential applications in energy harvesting, optoelectronics, and nanoscale biochemistry. The emerging field of magnetoplasmonics aims to merge magnetism and plasmonics to control localized plasmons or electromagnetic-induced collective electronic excitations using magnetic properties. This Perspective reviews the current state, challenges, and future opportunities in confined magnetoplasmonics, highlighting research directions in hybrid systems and novel materials, and recent developments in plasmon-driven magnetization dynamics, nanoscale opto-magnetism, and acousto-magnetoplasmonics.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Alessio Nicolini, Trey C. Pankratz, Marco Borsari, Rodolphe Clerac, Antonio Ranieri, Mathieu Rouzieres, John F. Berry, Andrea Cornia
Summary: Two tripodal oligo-& alpha;-pyridylamido ligands with interdigitated branches and 26 nitrogen donors form a trigonally symmetric coordination nanospace that accommodates a mixed valence iron cluster of much lower symmetry. This compound exhibits a large room-temperature magnetic moment and behaves as a single-molecule magnet, offering an appealing route to polyiron complexes. Bond valence sum (BVS) analysis and density functional theory (DFT) calculations were used to establish the protonation state of oxygen atoms and the formal oxidation states of the metals, revealing the structure and properties of the compound. Broken-symmetry DFT calculations predict strong ferromagnetic coupling between the two iron(II) ions, leading to a local S = 4 state that persists to room temperature and explaining the large magnetic moment measured at 300 K. The compound behaves as a single-molecule magnet, with detectable magnetization dynamics dominated by an Orbach-like mechanism.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Andrea Scarperi, Noemi Landi, Alessio Gabbani, Nabila Jarmouni, Silvia Borsacchi, Lucia Calucci, Andrea Pucci, Elisa Carignani, Francesco Pineider, Marco Geppi
Summary: Cesium lead bromide perovskite (CsPbBr3) cubic nanocrystals were obtained by colloidal synthesis and characterized using multinuclear Solid State NMR (SSNMR), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and optical spectroscopy. The different components of the nanocubes were studied separately by NMR, which also investigated the surface ligands and their interactions. The structural investigation of the perovskite nanocubes was addressed by exploiting spectral properties using Pb-207 and Cs-133 nuclei.
PURE AND APPLIED CHEMISTRY
(2023)
Article
Crystallography
Fabio Santanni, Laura Chelazzi, Lorenzo Sorace, Grigore A. Timco, Roberta Sessoli
Summary: Heterotopic ligands with chemically different binding centers are used to obtain heteronuclear metal complexes with different paramagnetic centers. This molecular approach has the potential to yield multi-spin adducts for quantum information processing. This study reports the structural and magnetic characterization of a novel adduct {Cr(pybd)(3)[Cu(cyclen)](2)}(BF4)(4), which demonstrates weak magnetic couplings and maintains distinctive EPR signals for Cr3+ and Cu2+ moieties.
Article
Chemistry, Physical
Claudio Pereti, Kevin Bernot, Thierry Guizouarn, Frantisek Laufek, Anna Vymazalova, Luca Bindi, Roberta Sessoli, Duccio Fanelli
Summary: We propose an approach based on DeepSet technology for supervised classification and regression of superconductive materials. The method takes the chemical constituents as input, avoiding artefacts from ordering in the list. Successful performance is achieved in classifying superconducting materials and quantifying their critical temperature. Using the trained neural network, we searched the International Mineralogical Association list and identified three superconducting candidates, confirming superconductivity in the synthetic analogue of michenerite and observing it for the first time in monchetundraite with critical temperatures in good agreement with theory predictions. This marks the first certified superconducting material identified through artificial intelligence methodologies.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fabio Santanni, Matteo Briganti, Giulia Serrano, Enrico Salvadori, Alessandro Veneri, Chiara Batistoni, Sofia F. Russi, Stefano Menichetti, Matteo Mannini, Mario Chiesa, Lorenzo Sorace, Roberta Sessoli
Summary: Sulfur-rich molecular complexes of dithiolene-like ligands are promising candidates for molecular spin qubits due to enhanced spin coherence properties in hydrogen-free environments. In this study, the mononegative 1,3,2-dithiazole-4-thione-5-thiolate (dttt-) ligand was used as an alternative to common dinegative dithiolate ligands. The synthesis and structural characterization of Cu2+, Ni2+, and Pt2+ complexes with this ligand were reported for the first time. XPS analysis indicated that intact molecules can be deposited on surfaces by sublimation, and AF exchange interactions mediated by S center dot center dot center dot S VdW interactions were observed.
Article
Chemistry, Multidisciplinary
Alessio Nicolini, Biagio Anderlini, Fabrizio Roncaglia, Andrea Cornia
Summary: A new polynucleating tripodal proligand H6tren(dpa)3 containing thirteen nitrogen donors of four different types was designed, synthesized, and isolated via a transition-metal-free triple N-arylation reaction. The use of Cs2CO3 as a base was essential for achieving high regioselectivity and eliminating overarylation almost completely. HFdpa was prepared with excellent yield by reaction of 2,6-difluoropyridine with 2-aminopyridine and found to be more reactive than HBrdpa, affording higher conversion and yield.
COMPTES RENDUS CHIMIE
(2023)
Article
Chemistry, Multidisciplinary
Alessio Gabbani, Andrea Taddeucci, Marco Bertuolo, Francesco Pineider, Laura Antonella Aronica, Lorenzo Di Bari, Gennaro Pescitelli, Francesco Zinna
Summary: Magnetic circular dichroism can elucidate the molecular interactions and structural parameters of organic chiral materials, making it a valuable tool for studying supramolecular order and structure-property relationships.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Manuel Imperato, Alessio Nicolini, Marco Borsari, Matteo Briganti, Mario Chiesa, Yu-Kai Liao, Antonio Ranieri, Arsen Raza, Enrico Salvadori, Lorenzo Sorace, Andrea Cornia
Summary: We investigated the performance of heterobimetallic lantern complexes [PtVO(SOCR)4] as charge neutral electronic qubits based on vanadyl complexes. The results showed that these complexes exhibit good spin coherence properties, making them suitable for applications in materials science and quantum technologies.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Jacopo Tricomi, Margherita Cacaci, Giacomo Biagiotti, Lucrezia Caselli, Lorenzo Niccoli, Riccardo Torelli, Alessio Gabbani, Maura Di Vito, Francesco Pineider, Mirko Severi, Maurizio Sanguinetti, Enzo Menna, Moreno Lelli, Debora Berti, Stefano Cicchi, Francesca Bugli, Barbara Richichi
Summary: The engineering of nanomaterial surfaces with bioactive molecules allows for control of their biological identity and the development of functional materials for specific applications. By using a green manufacturing process, the grafting of sugar headgroups onto graphene oxide surfaces significantly improves the antimicrobial activity of the nanomaterials and influences bacterial adhesion.
