Article
Engineering, Biomedical
Xiaocai Shan, Shoudong Huo, Lichao Yang, Jun Cao, Jiaru Zou, Liangyu Chen, Ptolemaios Georgios Sarrigiannis, Yifan Zhao
Summary: This paper proposes a new time-frequency brain functional connectivity analysis framework based on Revised Hilbert-Huang Transform, which outperforms wavelet-based method in terms of accuracy and time-frequency resolution. The method shows potential in better differentiating epileptic patients and healthy controls.
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Rahul Mishra, Hyunsoo Yang
Summary: This article reviews the emerging spintronic phenomena and the research advancements in diverse spin-based applications, discussing spin devices and systems for logic, memories, emerging computing schemes, flexible electronics, and terahertz emitters.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Engineering, Electrical & Electronic
Liming Fan, Hao Hu, Xiaojun Zhang, Huigang Wang, Chong Kang
Summary: The method utilizes a 1D CNN model with multi-feature fusion, extracting features from magnetic signals using Hilbert-Huang transform and discrete wavelet transform, and achieving high accuracy in both training and test sets. Field experiment results indicate good detection performance in low signal-to-noise ratio scenarios.
IEEE SENSORS JOURNAL
(2022)
Article
Mathematics
Jinghao Huang, Fedor Sukochev, Dmitriy Zanin
Summary: This article investigates the distribution function of martingale transforms in a probability space and provides a sharp estimate, complementing and extending classical results from previous research.
JOURNAL OF FUNCTIONAL ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Vitalii Shtender, Valerie Paul-Boncour, Roman Denys, Daniel Hedlund, Peter Svedlindh, Ihor Zavaliy
Summary: R2MgCo9 (R = Pr, Nd, Tb and Y) compounds and their hydrides were synthesized and characterized. The crystal structures and magnetic properties were systematically studied, revealing specific structural and magnetic behaviors.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Computer Science, Information Systems
Xiaoxiao Hu, Dong Cheng, Kit Ian Kou
Summary: This paper investigates sampling formulas of quaternionic functions under different transforms, demonstrating that bandlimited quaternionic functions can be reconstructed from samples. The relationships among sampling formulas under various transforms are discussed, along with estimation of truncation errors. Simulation results are provided to illustrate the effectiveness of the sampling formulas in applications.
FRONTIERS OF INFORMATION TECHNOLOGY & ELECTRONIC ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Feriel Rekhroukh, Linxing Zhang, Richard Y. Kong, Andrew J. P. White, Mark R. Crimmin
Summary: This study reports the reactions of cyclopropenes with compounds containing Mg-Mg bonds, demonstrating a concerted and stereoselective mechanism of 1,2-dimagnesiation. The findings shed new light on the stereochemistry of reactions involving magnesium reagents.
CHEMICAL COMMUNICATIONS
(2022)
Article
Mathematics, Applied
Palle Jorgensen, James Tian
Summary: We have developed a new harmonic analysis of reproducing kernels for various applications including feature fitting in machine learning algorithms, dynamics in large networks, spline approximation, determinantal point processes, stochastic processes, and fractals.
APPLIED AND COMPUTATIONAL HARMONIC ANALYSIS
(2021)
Article
Mathematics, Applied
Kui Li, Roderick Wong
Summary: Wiener-Hopf Equations, of the form u(t) = f(t) + integral(+infinity)(0) k(t - tau)u(tau)d tau, are commonly used in physical problems such as radiative transport, electromagnetic wave reflection, sound wave transmission, and material science. Known as renewal equations on the half-line in Probability Theory, they can be solved using asymptotic expansions and the Wiener-Hopf technique.
ANALYSIS AND APPLICATIONS
(2021)
Review
Chemistry, Multidisciplinary
Gilbert Santiago Canon Bermudez, Denys Makarov
Summary: Electronic skins (e-skins) are versatile technologies that can replicate traditional human skin functions and introduce new sensing capabilities like magnetic field detection. By adding an electronic sixth sense, these e-skins can utilize surrounding magnetic fields for touchless interactions.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Preeti Gupta, Dmitriy D. Karnaushenko, Christian Becker, Ibrahim E. Okur, Michael Melzer, Burak Oezer, Oliver G. Schmidt, Daniil Karnaushenko
Summary: The application of printed magnetoelectronics has been hindered by the lack of large area exchange coupled metallic multilayers. However, the development of a precise and high performance R2R sputtering technology has allowed for the fabrication of large area giant magnetoresistive thin-film stacks. This technology enables the printing of high performance magnetic sensors in a cost-efficient way, promoting integration with printed electronics.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Multidisciplinary
Sakhi Zaman, Faiza Nawaz, Suliman Khan, Zaheer-ud-Din
Summary: A novel quadrature based on interpolation is proposed for approximating finite Hilbert transforms with high-frequency parameter. The Lagrange interpolation technique and asymptotic-meshfree collocation method are utilized to address the challenges posed by Cauchy type singularity and oscillatory kernel. Numerical examples demonstrate the accuracy and efficiency of the proposed algorithm, which outperforms state of the art methods.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Electrical & Electronic
Juliano B. Lima, Marcos A. A. Gondim, Ricardo M. Campello de Souza
Summary: This brief introduces a new definition for the Hilbert number transform (HNT) using concepts related to trigonometry over finite fields. The approach starts with a specific definition for the Fourier number transform (FNT) and demonstrates how it allows the definition of an HNT analogous to the real-valued version of the corresponding transform. Additionally, a method to obtain the proposed HNT from the recently proposed steerable Fourier number transform is presented.
CIRCUITS SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Green & Sustainable Science & Technology
Hajime Sugita, Terumi Oguma, Junko Hara, Ming Zhang, Yoshishige Kawabe
Summary: The effects of combined addition of Mg- and Ca-based adsorbents on arsenic-removal performance and leaching inhibition were systematically tested. The results showed that most combined additions improved arsenic-removal performance, except for certain combinations of MgO or Mg(OH)2 with Ca-based adsorbents. The highest arsenic-removal performance was achieved with the combination of MgCO3 and Ca(OH)2. The combination of Mg-based adsorbents with CaO or Ca(OH)2 inhibited Mg-leaching, while the combination of CaO or Ca(OH)2 with MgCO3 inhibited Ca-leaching. The combination of MgCO3 with CaO or Ca(OH)2 improved arsenic-removal performance through incorporation and co-precipitation with arsenic.
Article
Mathematics
Dan Stefanoiu, Janetta Culita
Summary: John von Neumann (JvN) was a prominent scientist whose research in various fields, especially mathematics, significantly contributed to the advancement of science and technology. This article discusses the application of a function he defined, called cardinal sinus (sinc), in defining transforms for 1D signals in continuous and discrete time. The main properties of JvN Transforms (JvNTs) are orthogonality and invertibility, both important in data compression. The article presents the theoretical foundation, numerical algorithms, and simulations that demonstrate the effectiveness of JvNTs in signal processing.
Article
Physics, Applied
Jerome Williame, Joo-Von Kim
Summary: In this study, a time-delay oscillator using Mackey-Glass nonlinearity based on a pinned magnetic domain wall in a thin film nanostrip is proposed. By applying electric currents along the strip, the domain wall is deformed and displaced through spin transfer torques, which can be converted into a nonlinear transfer function. Micromagnetics simulations are used to investigate the effects of readout position, time delay, and feedback gain on the dynamics of the domain wall, highlighting the potential for self-sustained oscillations and complex transients.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Zhiyang Zeng, Zhaochu Luo, Laura J. Heyderman, Joo-Von Kim, Ales Hrabec
Summary: The study introduces a spintronic oscillator based on chiral coupling in thin magnetic films and demonstrates its potential application in neuromorphic computing through experiments.
APPLIED PHYSICS LETTERS
(2021)
Review
Nanoscience & Nanotechnology
Felix Trier, Paul Noel, Joo-Von Kim, Jean-Philippe Attane, Laurent Vila, Manuel Bibes
Summary: Oxide materials exhibit a wide range of functional properties, where electron correlations and spin-orbit coupling play significant roles. Recent advances in oxide spin-orbitronics have led to the realization of exotic phenomena and new functionalities for spintronics applications. The future prospects for this field involve further exploration of spin-charge interconversion, topological spin textures, and the influence of ferroelectricity on spin-orbit-driven effects.
NATURE REVIEWS MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Senne Fransen, Kherim Willems, Harold Philipsen, Devin Verreck, Willem Van Roy, Olivier Y. F. Henry, Antonio Arreghini, Geert Van den Bosch, Arnaud Furnemont, Maarten Rosmeulen
Summary: In this paper, a storage memory device based on the electro-deposition and electrodissolution of multilayered metal stacks in deep nanometer-sized wells is proposed, which enables bit densities of >1 Tbit/mm(2). It addresses the challenge of bit density scaling slowdown expected for 3-D NAND flash beyond 2030 and provides a proof-of-principle demonstration of the write/read mechanism on millimeter- and micrometer-sized electrodes, showing the device's potential for reaching very high bit densities. Simple analytical expressions based on finite element simulations are derived to evaluate the response time scaling for nanometer-sized electrodes in the envisioned device.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Analytical
Pieter Berden, Rodrigo S. Wiederkehr, Liesbet Lagae, Jan Michiels, Tim Stakenborg, Maarten Fauvart, Willem Van Roy
Summary: We developed an analytical model that explains the relationship between amplification efficiency, template accessibility, and rain in dPCR assays. Through Monte Carlo simulations, we found that reduced amplification efficiency leads to broader threshold cycle distributions, while template inaccessibility results in an exponential tail rain pattern.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Sybren Santermans, Geert Hellings, Marc Heyns, Willem Van Roy, Koen Martens
Summary: Electrolyte-gated silicon FETs have the potential to detect single molecules, benefiting the development of high-throughput molecular sensing chips in genomics or proteomics. However, the sensitivity of these FETs to charges near the gate oxide is strongly reduced by electrolyte screening. We found that nano-scaling all FET channel dimensions is necessary to achieve a sufficiently large single-molecule SNR. In our study, a suspended nanowire FET architecture with specific dimensions showed the highest SNR of about 10 for DNA detection in an electrolyte solution.
Article
Nanoscience & Nanotechnology
Titiksha Srivastava, Yanis Sassi, Fernando Ajejas, Aymeric Vecchiola, Igor Ngouagnia Yemeli, Herve Hurdequint, Karim Bouzehouane, Nicolas Reyren, Vincent Cros, Thibaut Devolder, Joo-Von Kim, Gregoire de Loubens
Summary: This study combines magnetic force microscopy, broadband ferromagnetic resonance, and micromagnetics simulations to show that a high-frequency mode accompanies the skyrmion lattice phase in thin-film multilayers of [Pt/FeCoB/AlOx](20). This mode involves the precession of skyrmion cores, generating 50-80 nm wavelength spin waves in the uniformly magnetized background. The observations are made possible by a low Gilbert damping constant, which is almost an order of magnitude lower than in similar ultrathin materials. The simulations also reveal the complex three-dimensional spin structure of the skyrmion cores, which plays a crucial role in spin wave generation.
Article
Materials Science, Multidisciplinary
A. Mouhoub, F. Millo, C. Chappert, J- Kim, J. Letang, A. Solignac, T. Devolder
Summary: We developed a reliable method to quantify the interlayer exchange coupling and intralayer exchange stiffness in synthetic antiferromagnets, and applied it to a specific material platform. We found that the interplay between the two exchange interactions leads to a gradient of magnetization orientation across the stack, which nontrivially affects its hysteresis and spin wave eigenmodes. Using micromagnetic simulations and experimental measurements, we determined the magnetic parameters that best describe the sample behavior, revealing the independence of exchange stiffness on thickness and the variation of interlayer exchange coupling with thickness.
PHYSICAL REVIEW MATERIALS
(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
Materials Science, Multidisciplinary
T. Devolder, S-M Ngom, A. Mouhoub, J. Letang, J- Kim, P. Crozat, J-P Adam, A. Solignac, C. Chappert
Summary: We studied how to characterize a population of spin waves by analyzing the electrical microwave noise. The noise contains contributions from both incoherent spin waves and electronic fluctuations. By separating these contributions, we can obtain information about the magnetic susceptibility and the mode-resolved effective magnon temperature.
Article
Materials Science, Multidisciplinary
Paul Bouquin, Joo-Von Kim, Olivier Bultynck, Siddharth Rao, Sebastien Couet, Gouri Sankar Kar, Thibaut Devolder
Summary: The study investigates the motion of a domain wall in perpendicular anisotropy magnets induced by spin torque, using time-resolved measurement and modeling. The dynamics of the wall is governed by the energy difference between different wall configurations at the disk center and is influenced by the disk diameter. The wall motion is analyzed using a collective coordinate model and is characterized by oscillations resulting from the exchange of energy between two degrees of freedom.
Article
Materials Science, Multidisciplinary
Jeremy Letang, Claudia de Melo, Charles Guillemard, Aymeric Vecchiola, Damien Rontani, Sebastien Petit-Watelot, Myoung-Woo Yoo, Thibaut Devolder, Karim Bouzehouane, Vincent Cros, Stephane Andrieu, Joo-Von Kim
Summary: This experimental study focuses on the vortex dynamics in magnetic nanocontacts based on pseudo spin valves comprising the Co2MnGe Heusler compound. By combining precise film growth and nanoindentation techniques, different types of spin-transfer induced dynamics related to different modes of the magnetic vortex configuration were observed, such as mode hopping, mode coexistence, and mode extinction, in addition to the usual gyration mode.
Article
Engineering, Electrical & Electronic
Senne Fransen, Kherim Willems, Harold Philipsen, Devin Verreck, Willem Van Roy, Olivier Y. F. Henry, Antonio Arreghini, Geert Van den Bosch, Arnaud Furnemont, Maarten Rosmeulen
Summary: The proposed storage memory device achieves high bit densities through electro-deposition and electrodissolution in deep nanometer-sized wells, addressing the challenge of bit density scaling slowdown in future 3-D NAND flash. Experimental results on millimeter- and micrometer-sized electrodes demonstrate the device's potential for achieving very high bit densities.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
