Article
Chemistry, Multidisciplinary
Lun Jin, Danrui Ni, Xin Gui, Daniel B. Straus, Qiang Zhang, Robert J. Cava
Summary: The authors successfully doped Sr2GaSbO6, a magnetically silent double perovskite semiconductor, with magnetic trivalent cation Mn3+ to induce ferromagnetism and tune its bandgap. The new material, Sr2Ga1-xMnxSbO6 double perovskite, exhibits tunable ferromagnetic ordering temperature and bandgap, suggesting its potential application in next-generation oxide-based spintronic devices.
Article
Materials Science, Multidisciplinary
Nandana Bhattacharya, S. Middey
Summary: This study investigates the effects of sample inhomogeneity on the Hall effect in ferromagnetic heterostructures. By using a phenomenological model, the researchers find that nonuniform magnetization distribution can give rise to additional features in the Hall effect, which might not necessarily be intrinsic topological Hall effect.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yae Zy Kang, Gwang Hwi An, Min-Gi Jeon, So Jeong Shin, Su Jin Kim, Min Choi, Jae Baek Lee, Tae Yeon Kim, Ikhwan Nur Rahman, Hyun Young Seo, Seyoung Oh, Byungjin Cho, Jihoon Choi, Hyun Seok Lee
Summary: This study demonstrates a significant increase in electrical mobility and reduced hysteresis in TMD-based FETs hybridized with metal halide perovskites. The injection of electrons from perovskites into TMDs induces heavy n-doping and repairs point defects, leading to improved performance.
Article
Computer Science, Information Systems
Alexandra C. C. Barmpatza, Anargyros T. T. Baklezos, Ioannis O. O. Vardiambasis, Christos D. D. Nikolopoulos
Summary: This paper studies the magnetic behavior of supported cobalt nanoparticles with different crystal structures when exposed to an Earth magnetic field. The simulation and analysis demonstrate that the next neighbor distance between particles significantly affects the hysteresis loop. The objective is to develop an in situ method for simulating and evaluating magnetic fields generated by heterogeneous catalysts, enabling real-time remote monitoring of catalytic processes.
Article
Chemistry, Multidisciplinary
Zakhar R. Kudrynskyi, Illya Mintyanskii, Petro Savitskii, Zakhar D. Kovalyuk
Summary: This study provides important knowledge of the effect of cobalt impurities on the physical properties of InSe, which is crucial for tailoring the parameters of this semiconductor for applications in electronics and spintronics.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Analytical
Upasana Choudhari, Niranjan Ramgir, Dattatray Late, Shweta Jagtap, A. K. Debnath, K. P. Muthe
Summary: This research provides valuable insights into the effects of doping and rGO functionalization on electrochemical sensing. The synthesis of Co/Fe-doped SnO2 nanocomposites using hydrothermal method resulted in a cube-like structure formed by spherical nanoparticles. The doping of Co/Fe and their morphologies significantly affected the sensing performance for heavy metal ions. The functionalization of rGO on the metal-doped nanocomposites improved the sensing performance compared to pure and metal-doped SnO2 nanocomposites.
MICROCHEMICAL JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Lalmuan Chhana, Lalmuanpuia Vanchhawng, Dibya Prakash Rai, Ramesh Chandra Tiwari, Lalhriat Zuala
Summary: Based on DFT calculations, it is found that B- and C-doped ZnO monolayers exhibit different magnetic behaviors at high doping concentrations, with one being ferromagnetic and the other being antiferromagnetic metal.
INTERNATIONAL NANO LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Xing Huang, Shuai Fu, Cong Lin, Yang Lu, Mingchao Wang, Peng Zhang, Chuanhui Huang, Zichao Li, Zhongquan Liao, Ye Zou, Jian Li, Shengqiang Zhou, Manfred Helm, Petko St. Petkov, Thomas Heine, Mischa Bonn, Hai I. Wang, Xinliang Feng, Renhao Dong
Summary: In this study, a strategy for synthesizing high-mobility semiconducting conjugated coordination polymers (c-CPs) using novel conjugated ligands with D2h symmetry was demonstrated. The reduced symmetry of the 4 + 2 ligands compared to conventional phenyl ligands led to anisotropic coordination in the formation of c-CPs. A single-crystalline three-dimensional (3D) c-CP Cu4DHTTB with orthogonal ribbon-like pi-d conjugated chains was successfully achieved. This c-CP exhibited a small band gap, dispersive energy bands, and high charge carrier mobilities, laying the foundation for high-performance c-CP-based (opto-)electronics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Ruslan Salikhov, Igor Ilyakov, Lukas Koerber, Attila Kakay, Rodolfo A. Gallardo, Alexey Ponomaryov, Jan-Christoph Deinert, Thales V. A. G. de Oliveira, Kilian Lenz, Juergen Fassbender, Stefano Bonetti, Olav Hellwig, Juergen Lindner, Sergey Kovalev
Summary: Engineering of spin-orbit interactions in a magnetic multilayered structure enables the coherent generation of spin waves using terahertz radiation, benefiting spintronic device development. By exploiting relativistic spin-orbit torques confined to metal/ferromagnet interfaces, we improve light-matter interaction and successfully excite spin-wave modes with frequencies up to 0.6 THz and wavelengths as short as 6 nm using broadband terahertz radiation. Our results have broad applicability and offer the potential for nanoscale control of high-frequency signals.
Article
Multidisciplinary Sciences
Vadym Iurchuk, Javier Pablo-Navarro, Tobias Hula, Ryszard Narkowicz, Gregor Hlawacek, Lukas Koerber, Attila Kakay, Helmut Schultheiss, Juergen Fassbender, Kilian Lenz, Juergen Lindner
Summary: Localized dynamical modes in 1D spin-wave conduits were studied using microresonator ferromagnetic resonance technique. By trimming the edges of the microstrip and creating nano gaps, additional resonances emerged, which were attributed to modes localized at the inner edges of the strips. Micromagnetic simulations confirmed the localization of the lowest-energy modes and their tunability by changing the spatial separation between the microstrips.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Oleksii M. Volkov, Daniel Wolf, Oleksandr V. Pylypovskyi, Attila Kakay, Denis D. Sheka, Bernd Buechner, Juergen Fassbender, Axel Lubk, Denys Makarov
Summary: Chiral effects originate from the lack of inversion symmetry within the lattice unit cell or sample's shape. Being mapped onto magnetic ordering, chirality enables topologically non-trivial textures with a given handedness. In this study, the existence of a static 3D texture characterized by two magnetochiral parameters, magnetic helicity of the vortex and geometrical chirality of the core string, is demonstrated in a geometrically curved asymmetric permalloy cap.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Diana Isabel Sandoval Bojorquez, Zeljko Janicijevic, Brenda Palestina Romero, Eduardo Sergio Oliveros Mata, Markus Laube, Anja Feldmann, Alexandra Kegler, Laura Drewitz, Ciaran Fowley, Jens Pietzsch, Juergen Fassbender, Torsten Tonn, Michael Bachmann, Larysa Baraban
Summary: Detection of COVID-19-associated antigens and respective antibodies is achieved using an interdigitated gold nanowire-based impedance nanobiosensor. The sensor devices demonstrate high sensitivity and a low limit of detection for the antibodies and virus antigen. Clinical plasma samples analysis shows the applicability of this platform in determining the infection or immunity status of patients.
Article
Chemistry, Multidisciplinary
Mingchao Wang, Gang Wang, Chandrasekhar Naisa, Yubin Fu, Sai Manoj Gali, Silvia Paasch, Mao Wang, Haiko Wittkaemper, Christian Papp, Eike Brunner, Shengqiang Zhou, David Beljonne, Hans-Peter Steinrueck, Renhao Dong, Xinliang Feng
Summary: The study reports a 2D c-COF electrode material that can store protons rapidly in mild aqueous electrolyte and strong acid. The unique proton affinity mechanism of the 2D c-COF is revealed, and the outstanding rate capability is demonstrated.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Moritz Hoesch, Olena Fedchenko, Mao Wang, Christoph Schlueter, Dmitrii Potorochin, Katerina Medjanik, Sergey Babenkov, Anca S. Ciobanu, Aimo Winkelmann, Hans-Joachim Elmers, Shengqiang Zhou, Manfred Helm, Gerd Schoenhense
Summary: Multiple dopant configurations of Te impurities in silicon are investigated using various techniques. Strong chemical core level shifts distinguish these configurations from isolated impurities. Multi-Te configurations, such as dimers or Te ions surrounding a vacancy, are clearly identified. The results contribute to understanding the exceptional activation of free charge carriers in hyperdoping of chalcogens in silicon.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Juanmei Duan, Maciej O. Liedke, Wojciech Dawidowski, Rang Li, Maik Butterling, Eric Hirschmann, Andreas Wagner, Mao Wang, Lawrence Boyu Young, Yen-Hsun Glen Lin, Minghwei Hong, Manfred Helm, Shengqiang Zhou, Slawomir Prucnal
Summary: In this study, the effect of intense pulsed light melting on defect distribution and activation efficiency in chalcogenide-implanted GaAs was investigated. The results showed that after nanosecond pulsed light melting, the main defects in heavily doped GaAs are gallium vacancies decorated with chalcogenide atoms substituting As.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Lukas Koerber, Christopher Heins, Tobias Hula, Joo-Von Kim, Sonia Thlang, Helmut Schultheiss, Juergen Fassbender, Katrin Schultheiss
Summary: Magnons are elementary excitations in magnetic materials that can undergo nonlinear multimode scattering processes. By harnessing the interaction between magnon modes, pattern recognition can be achieved. Experimental results show that different azimuthal modes can be excited through three-magnon scattering, with amplitude dependent on the input sequences. Recognition rates as high as 99.4% can be achieved for four-symbol sequences using scattered modes, even in the presence of amplitude noise.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Christian D. Matthus, Phanish Chava, Kenji Watanabe, Takashi Taniguchi, Thomas Mikolajick, Manfred Helm, Artur Erbe
Summary: In this study, we demonstrated the usability of a fully 2D-materials based device as a temperature sensor for linear temperature measurement at cryogenic temperatures. By applying different temperatures to the device and recording the I-V characteristics, we found that the main current flows through the device when it is reversely biased, contrary to classical expectation. We also investigated the temperature-sensor performance by applying a constant current to the device and measuring the voltage drop at different temperatures.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Xing Huang, Shuai Fu, Cong Lin, Yang Lu, Mingchao Wang, Peng Zhang, Chuanhui Huang, Zichao Li, Zhongquan Liao, Ye Zou, Jian Li, Shengqiang Zhou, Manfred Helm, Petko St Petkov, Thomas Heine, Mischa Bonn, Hai I. Wang, Xinliang Feng, Renhao Dong
Summary: This study demonstrates a strategy for synthesizing high-mobility semiconducting coordination polymers (c-CPs) using novel conjugated ligands with reduced symmetry. The synthesized c-CPs exhibit a small band gap, dispersive energy bands, and high charge carrier mobilities, outperforming previously reported conductive coordination polymers. This molecular design strategy lays the foundation for achieving high-performance c-CP-based (opto-)electronics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
J. Michael Klopf, Igor Ilyakov, Alexey Ponomaryov, Alexej Pashkin, Jan-Christoph Deinert, Thales V. A. G. de Oliveira, Pavel Evtushenko, Manfred Helm, Stephan Winnerl, Sergey Kovalev
Summary: The free-electron laser (FEL) is an ideal source of high-power coherent THz radiation. However, the carrier envelope phase (CEP) of FEL pulses is not fixed, making measurements of coherent THz-driven processes difficult. This paper presents a novel technique that enables real-time measurement of the CEP of every FEL pulse, providing possibilities for the study of coherent THz-driven phenomena and advanced diagnostics for CEP stable operation of an FEL.
2023 48TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, IRMMW-THZ
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Marcos G. Faria, Stephan Winnerl, Alexej Pashkin, Manfred Helm, Ece Uykur
Summary: In this study, the temperature- and fluence-dependent carrier dynamics of different magnetic Kagome metals were investigated using the optical pump-probe technique. Distinct carrier relaxations were observed, which can be partly attributed to a simple two-temperature model.
2023 48TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, IRMMW-THZ
(2023)
Article
Geochemistry & Geophysics
Asim Siddique, Peter Boelens, Fangchao Long, Shengqiang Zhou, Veerle Cnudde, Thomas Leissner
Summary: Magnetic separation plays a crucial role in mineral processing and recycling industries. This study proposes a methodology to comprehensively characterize and classify Waste Electrical and Electronic Equipment (WEEE) slag, aiming to establish the connection between slag properties and the separation process. The methodology involves sieving, classification based on magnetic susceptibility, and mineral liberation analysis. This in-depth analysis provides insights into the separation behavior of different slag phases, contributing to the development of predictive separation models.
Article
Materials Science, Multidisciplinary
Ivan Fotev, Stephan Winnerl, Saicharan Aswartham, Sabine Wurmehl, Bernd Buechner, Harald Schneider, Manfred Helm, Alexej Pashkin
Summary: In this study, the suppression of spin density wave (SDW) order in BaFe2As2 under pressure was investigated using optical pump-probe technique. The results show that the pressure-induced suppression of SDW order at low temperature occurs gradually, in contrast to the thermally induced SDW transition. This suggests that the pressure-driven quantum phase transition in BaFe2As2 (and probably other iron pnictides) is continuous and it is caused by the gradual worsening of the Fermi-surface nesting conditions.
