Article
Materials Science, Multidisciplinary
Shaohai Chen, Xinyu Shu, Jing Zhou, Chenghang Zhou, Qidong Xie, Tieyang Zhao, Liang Liu, Weinan Lin, Jingsheng Chen
Summary: In this study, AFM Mn2Au films with different crystal structures were systematically investigated, and it was demonstrated that single-crystal Mn2Au possesses a significantly higher spin torque efficiency (xi(DL)) of approximately 0.333 compared to polycrystalline Mn2Au. Furthermore, the integration of interfacial effects in the single-crystal Mn2Au/Py system increased the effective xi(DL) to 0.731, more than two times larger than that reported for the Mn2Au/CoFeB system. This research highlights the potential of Mn2Au as an efficient SOT source and its application in future AFM material-based SOT integration technology.
SCIENCE CHINA-MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Nilay Maji, J. Panda, A. Santosh Kumar, T. K. Nath
Summary: In this study, efficient electrical spin injection and detection from NFO into p-Si via MgO tunnel barrier was achieved and proved to be promising. The use of oxide magnetic materials in spin injection and detection for room temperature spin-based electronic devices has been demonstrated.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Keun-Hong Min, Duk Hyun Lee, Sang-Jun Choi, In-Ho Lee, Junho Seo, Dong Wook Kim, Kyung-Tae Ko, Kenji Watanabe, Takashi Taniguchi, Dong Han Ha, Changyoung Kim, Ji Hoon Shim, Jonghwa Eom, Jun Sung Kim, Suyong Jung
Summary: The authors investigate the tunnelling magnetoresistance in Fe3GeTe2/hBN(WSe2)/Fe3GeTe2 magnetic tunnel junctions and report strong variations including polarization reversals with bias. Using van der Waals heterostructures with two-dimensional magnets, they demonstrate electrically tunable spin injection and detection, as well as modulated and reversed net spin polarization of the injected carriers, leading to changes in tunnelling magnetoresistance. The authors attribute the spin polarization reversals to contributions from high-energy localized spin states in the metallic ferromagnet, which is inaccessible in conventional magnetic junctions.
Article
Chemistry, Multidisciplinary
Bin Fang, Luis Sanchez-Tejerina San Jose, Aitian Chen, Yan Li, Dongxing Zheng, Yinchang Ma, Hanin Algaidi, Kai Liu, Giovanni Finocchio, Xixiang Zhang
Summary: This research demonstrates the feasibility of achieving perpendicular EB reversal in antiferromagnetic materials and ferromagnetic multilayers, providing a direction for introducing new functionality in spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Hiroaki Shishido, Yuta Hosaka, Kenta Monden, Akito Inui, Taisei Sayo, Yusuke Kousaka, Yoshihiko Togawa
Summary: Nonlocal spin polarization phenomena were investigated in devices made of chiral metallic single crystals of CrNb3S6 and NbSi2, as well as polycrystalline NbSi2. It was demonstrated that simultaneous injection of charge currents in opposite ends of the device induced controllable switching behavior of spin polarization in a nonlocal setup. This nonlocal spin polarization occurred regardless of material and device dimensions, indicating that current injection in the nonlocal configuration split spin-dependent chemical potentials throughout the chiral crystal. The proposed model of spin-dependent chemical potentials successfully explained the experimental data. The nonlocal double-injection device shows significant potential for controlling spin polarization in large areas due to the long-range nonlocal spin polarization in chiral materials.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
L. N. Jiang, Yun-Peng Wang, W. Z. Chen, X. F. Han
Summary: The high tunneling electroresistance (TER) effect in multiferroic tunnel junctions can be enhanced through interface engineering by manipulating the interfacial ferroelectric displacement to modulate the tunnel barrier width and efficiency. This revealed principle provides a novel route for enhancing TER effect through interface engineering.
Article
Chemistry, Multidisciplinary
Xiaoyue Zhang, Ning Tang, Liuyun Yang, Chi Fang, Caihua Wan, Xingchen Liu, Shixiong Zhang, Yunfan Zhang, Xinqiang Wang, Yuan Lu, Weikun Ge, Xiufeng Han, Bo Shen
Summary: The spin injection into 2D electron gas in AlN/GaN heterostructures was studied, showing long spin relaxation time and the mechanism of spin injection. The results reveal the promising potential of 2DEG in AlN/GaN heterostructures for spin field-effect transistor applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Jindi Feng, Kunpeng Li, Mingkun Zheng, Wancheng Zhang, Yong Liu, Dengjing Wang, Zhenhua Zhang, Chao Zuo, Rui Xiong, Zhihong Lu
Summary: Magnetic tunnel junctions (MTJs) with efficient spin-filtering effect and large tunneling magnetoresistance (TMR) ratio are highly desirable in spintronics. This study investigates the spin-dependent transport properties of van der Waals (vdW) MTJs comprising a 2H-WSe2 tunnel barrier and a 1T-CrSe2 or 1T-MoSe2/1T-CrSe2 electrode. The dual-electrode MTJ exhibits excellent spin-filtering effect and a giant TMR ratio, attributed to the half-metallicity of CrSe2 induced by charge transfer at the electrode interface.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yuming Jin, Jia Li, Guang Wang, Qian Zhang, Ze Liu, Xiujuan Mao
Summary: The electronic structures and Rashba effect of two-dimensional polar tetragonal perovskites TlSnX3 (X = Cl, Br, I) were investigated using density functional theory. Intrinsic Rashba effects were found, with TlSnI3 exhibiting the largest Rashba constant. Additionally, TlSnBr3 and TlSnI3 showed strong responses to an applied electric field. These materials have promising applications due to their large Rashba constants and strong electric field responses.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
I Angervo, M. Saloaro, H. Palonen, H. Huhtinen, P. Paturi, T. Makela, S. Majumdar
Summary: We present the fabrication of the first organic spin valve device based on Sr2FeMoO6, using Tris(8-hydroxyquinolinato) aluminum as a spin transport layer. The device exhibits hysteric magnetoresistance with approximately 20%-30% switching between high and low resistance states at low temperatures. This study demonstrates the potential of organic semiconductors to form suitable interfaces with double perovskite Sr2FeMoO6 for efficient low temperature operation and improve room temperature performance in tunneling devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Suchetana Mukhopadhyay, Pratap Kumar Pal, Subhadeep Manna, Chiranjib Mitra, Anjan Barman
Summary: Efficient room-temperature spin pumping is demonstrated in Sub/BiSbTe1.5Se1.5/Co20Fe60B20/SiO2 thin films using all-optical time-resolved magneto-optical Kerr effect magnetometry. The spin-mixing conductances of the interface and the spin diffusion length in the films are determined, indicating their potential as promising materials for spin-orbitronic devices.
NPG ASIA MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yin-Chun Hung, Yu-Xiang Zhao, Wei-Chen Hung
Summary: This study evaluates the feasibility of using Electrical Resistivity Tomography (ERT) to detect and discuss the location, size, and depth of underground tunnels on Kinmen Island. The results show that 2D-ERT can clearly show the tunnel location and shape, and deep learning techniques can enhance the interpretation ability and resolution of the ERT measurement results.
APPLIED SCIENCES-BASEL
(2022)
Article
Quantum Science & Technology
Koustuv Dutta, Surya N. Panda, Takeshi Seki, Santanu Pan, Koki Takanashi, Anjan Barman
Summary: In this study, spin pumping in a CFMS/Pt heterostructure was investigated using all-optical time-resolved magneto-optical Kerr magnetometry. The findings revealed a giant value of interfacial spin transparency and a small intrinsic damping, making it an ideal material for the development of advanced spin-orbitronic devices.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
K. Pasanai, S. Thasitha, P. Saokaew
Summary: Theoretical study on charge and spin transport across magnetic tunnel junctions revealed that changes in insulating layer thickness, electron effective mass mismatch, and potential barrier height can affect the conductance spectra, leading to either direct transmission or oscillation behavior. By setting parameters to real values from experiments, it was observed that direct transmission can occur under certain conditions related to insulating layer thickness and potential barrier height.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Victor Zatko, Simon M. -M. Dubois, Florian Godel, Marta Galbiati, Julian Peiro, Anke Sander, Cecile Carretero, Aymeric Vecchiola, Sophie Collin, Karim Bouzehouane, Bernard Servet, Frederic Petroff, Jean-Christophe Charlier, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor
Summary: This study reports on the significant spin-filtering effects in epitaxial graphene-based spin valves, particularly enhanced in the case of multilayer graphene. The combination of chemical vapor deposited multilayer graphene with high-quality epitaxial Ni(111) ferromagnetic spin source led to the obtained results. Complete nanometric spin valve junctions were fabricated using a local probe indentation process, and spin properties were extracted from the graphene-protected ferromagnetic electrode using a reference Al2O3/Co spin analyzer. The study discusses the emerging physical picture of graphene-ferromagnet systems and provides insight into the efficient spin filtering effects and the interfacial matching of the graphene layers with the spin-polarized Ni surface, showcasing the potential of low Resistance-Area (RA) graphene interfaces in spin-based devices.
Article
Physics, Multidisciplinary
Lu Jiang, Cun Xue, Stefan Marinkovic, E. Fourneau, Tie-Quan Xu, Xin-Wei Cai, N. D. Nguyen, A. Silhanek, You-He Zhou
Summary: Topology is crucial for understanding the physical properties of superconductors. In this study, magnetic flux avalanches in superconducting films with multiply-connected geometries were experimentally studied using magneto-optical imaging technique. A domino effect was observed, where avalanches triggered at the outer ring stimulated avalanches at the inner ring, impairing the expected magnetic shielding. Numerical simulations showed that this effect was not caused by heat conduction, but mainly due to the variation in local current distribution near the preceding flux avalanche in the outer ring, leading to a ripple effect on the local magnetic field profile in the gap. The domino effect of thermomagnetic instabilities could be switched on/off by adjusting the environmental temperature and the gap width between the concentric rings.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Stefan Marinkovic, Alejandro Fernandez-Rodriguez, Emile Fourneau, Mariona Cabero, Hailin Wang, Ngoc Duy Nguyen, Jaume Gazquez, Narcis Mestres, Anna Palau, Alejandro Silhanek
Summary: Simultaneous optical microscopy and electric transport measurements on La0.7Sr0.3MnO3 nanobridges grown on SrTiO3 (STO) provide direct evidence of directional oxygen vacancy migration under large voltage bias. Comparative study on structures with applied voltages across a micron-scale gap reveals that high electric fields induce electrolytic modifications confined to the anode. Extensive electromigration results in the formation of linear surface scars on the STO substrate, attributed to thermal rather than electrical origin, and correlated with the proliferation of edge dislocations and local lattice expansion.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Robin R. Jones, Cornelia Miksch, Hyunah Kwon, Coosje Pothoven, Kristina R. Rusimova, Maarten Kamp, Kedong Gong, Liwu Zhang, Tim Batten, Brian Smith, Alejandro V. Silhanek, Peer Fischer, Daniel Wolverson, Ventsislav K. Valev
Summary: Against the backdrop of current healthcare and climate emergencies, surface enhanced Raman scattering (SERS) is gaining popularity as a technique for identifying and fingerprinting molecules in various substances. Researchers have investigated plasmonic nanohelices and found that they possess excellent SERS properties. These nanohelices can be produced at a low cost, exhibit strong and uniform Raman enhancement effects, and are anticipated to have broad applications in surface enhanced Raman spectroscopies and material science.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Liping Zhang, Zuyu Xu, Xiaojie Li, Xu Zhang, Mingyang Qin, Ruozhou Zhang, Juan Xu, Wenxin Cheng, Jie Yuan, Huabing Wang, Alejandro V. Silhanek, Beiyi Zhu, Jun Miao, Kui Jin
Summary: High quality Nb films on both flexible polyimide (PI) and rigid Al2O3 substrates were studied. Curved Nb/PI film exhibits different superconducting transition and vortex dynamics compared to flat Nb/Al2O3 film due to gradient distribution of vortex density and variation of superconductivity. Reentrant superconductivity was induced in curved Nb/PI film by vortex pinning from both in-plane and out-of-plane vortices. These findings provide important insights for theoretical investigations and practical developments of flexible superconductors.
Article
Computer Science, Artificial Intelligence
Long H. Nguyen, Nhat Truong Pham, Van Huong Do, Liu Tai Nguyen, Thanh Tin Nguyen, Hai Nguyen, Ngoc Duy Nguyen, Thanh Thi Nguyen, Sy Dzung Nguyen, Asim Bhatti, Chee Peng Lim
Summary: COVID-19 is a global pandemic caused by the highly contagious SARS-CoV-2 virus. Developing an efficient self-testing service for SARS-CoV-2 at home is crucial, especially with the emergence of the Delta variant. This study introduces a two-stage vision-based framework called Fruit-CoV that detects SARS-CoV-2 infections using recorded cough sounds.
EXPERT SYSTEMS WITH APPLICATIONS
(2023)
Article
Physics, Applied
S. Marinkovic, E. A. Abbey, D. A. D. Chaves, S. Collienne, E. Fourneau, L. Jiang, C. Xue, Y. H. Zhou, W. A. Ortiz, M. Motta, N. D. Nguyen, A. Volodin, J. Van de Vondel, A. V. Silhanek
Summary: We investigated targeted and localized material modifications produced by electropulsing on Al-capped Nb microbridges. The affected areas showed a decrease in work function, but little morphological change was observed. The extent of the modified regions was strongly influenced by terminal geometry, and modeling estimated a threshold temperature of 435 +/- 35 K for inducing material modifications. These findings provide insights into subtle modifications and progress in nanofabrication techniques.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Emile Fourneau, Jon Ander Arregi, Aleix Barrera, Ngoc Duy Nguyen, Simon Bending, Alvaro Sanchez, Vojtech Uhlir, Anna Palau, Alejandro V. V. Silhanek
Summary: This study investigates the effects of downsizing magnetic metamaterials for on-chip integration. The non-linear magnetic response of ferromagnetic components, magnetic irreversibility, formation of magnetic domains, and the geometry and size of devices are analyzed. The results show that implementing metasurfaces at the microscale can enhance the performance of magnetic field detectors and enable remote charging of small electric devices, opening up new possibilities in information and communication technologies.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Multidisciplinary
Naama Sliti, Saad Touihri, Ngoc Duy Nguyen
Summary: In this study, a thin film of titanium dioxide (TiO2) was sandwiched between n-type aluminum-doped zinc oxide (AZO) and p-type cuprous oxide (Cu2O) to improve the efficiency of metal oxide-based solar cells. Numerical simulation was used to investigate the effects of device parameters on the performance of Cu2O-based solar cells, and optimal results were obtained. The addition of TiO2 thin film significantly increased the efficiency of the solar cell from 2.54% to 5.02%.
ENGINEERING RESEARCH EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Stefan Marinkovic, Edoardo Trabaldo, Simon Collienne, Floriana Lombardi, Thilo Bauch, Alejandro V. Silhanek
Summary: We conducted experiments on the displacement of oxygen vacancies at high current densities in YBa2Cu3O7-delta films grown on MgO substrates. Our findings indicate that the onset of vacancy migration is determined by local temperature rather than activation energy. We also observed an intermediate phase characterized by a decrease in resistivity before long-range migration of vacancies.
Article
Materials Science, Multidisciplinary
L. B. L. G. Pinheiro, L. Jiang, E. A. Abbey, Davi A. D. Chaves, A. J. Chiquito, T. H. Johansen, J. Van de Vondel, C. Xue, Y. -h. Zhou, A. V. Silhanek, W. A. Ortiz, M. Motta
Summary: This study investigates the effect of thickness gradient on the properties of superconducting materials by preparing superconducting Pb thin films with a thickness gradient. Experimental and numerical simulation results show that the thickness gradient affects the magnetic flux penetration and critical current density of the films, and wedge-shaped films are a viable approach to investigate thickness-dependent properties of superconducting materials.
Article
Chemistry, Multidisciplinary
Guillaume Libeert, Ramasamy Murugesan, Marton Guba, Wout Keijers, Simon Collienne, Bart Raes, Steven Brems, Stefan De Gendt, Alejandro Silhanek, Tibor Holtzl, Michel Houssa, Joris Van de Vondel, Ewald Janssens
Summary: This paper presents a new method to quantify the energy barriers for adsorption and desorption of gas molecules on few-atom clusters by utilizing reaction-induced changes of the doping level of a graphene substrate. The method is illustrated for oxygen adsorption on Au-3 clusters.
Article
Chemistry, Multidisciplinary
Simon Collienne, Danial Majidi, Joris Van de Vondel, Clemens B. Winkelmann, Alejandro Silhanek
Summary: In a multi-branch metallic interconnect, the material properties can be selectively modified by properly selecting the intensity and polarity of the applied current. This inexpensive and straightforward approach allows for progressive modifications at specific junctions without affecting neighboring terminals, making it a significant step towards all-electric control of multiterminal Josephson junctions.