Article
Chemistry, Multidisciplinary
Weihao Li, Wenkai Zhu, Gaojie Zhang, Hao Wu, Shouguo Zhu, Runze Li, Enze Zhang, Xiaomin Zhang, Yongcheng Deng, Jing Zhang, Lixia Zhao, Haixin Chang, Kaiyou Wang
Summary: In this study, the perpendicular magnetization of the vdW ferromagnet Fe3GaTe2 was successfully switched at room temperature using spin-orbit torques with a relatively low current density. The high efficiency of this method, quantitatively determined by harmonic measurements, provides a significant basis for the development of vdW-ferromagnet-based spintronic applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Inseob Shin, Won Joon Cho, Eun-Su An, Sungyu Park, Hyeon-Woo Jeong, Seong Jang, Woon Joong Baek, Seong Yong Park, Dong-Hwan Yang, Jun Ho Seo, Gi-Yeop Kim, Mazhar N. Ali, Si-Young Choi, Hyun-Woo Lee, Jun Sung Kim, Sung Dug Kim, Gil-Ho Lee
Summary: The study explores the control of magnetization in ferromagnets using spin-orbit torque, highlighting the use of vdW topological materials WTe2 and ferromagnet Fe3GeTe2 to meet the requirements for energy-efficient spintronic devices. By engineering vdW-type materials, a significantly reduced switching current density is achieved, offering a promising approach for energy-efficient magnetization control in SOT-based spintronics.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Franziska Martin, Kyujoon Lee, Maurice Schmitt, Anna Liedtke, Aga Shahee, Haakon Thomt Simensen, Tanja Scholz, Tom G. Saunderson, Dongwook Go, Martin Gradhand, Yuriy Mokrousov, Thibaud Denneulin, Andras Kovacs, Bettina Lotsch, Arne Brataas, Mathias Klaeui
Summary: We investigate the current-induced magnetisation manipulation in two-dimensional Fe3GeTe2 material and find that its crystalline structure allows for the presence of both interfacial and bulk spin-orbit torques, enabling efficient magnetisation switching without the need for complex multilayer engineering.
MATERIALS RESEARCH LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Wei Tang, Haoliang Liu, Zhe Li, Anlian Pan, Yu-Jia Zeng
Summary: Spin-orbit torque (SOT) plays a crucial role in the electrical manipulation of magnetization in spintronic devices, with van der Waals-layered materials showing promising properties for efficient SOT applications. By converting charge current into spin current, these materials can effectively control magnetization.
Article
Chemistry, Multidisciplinary
Qidong Xie, Weinan Lin, Jinghua Liang, Hengan Zhou, Moaz Waqar, Ming Lin, Siew Lang Teo, Hao Chen, Xiufang Lu, Xinyu Shu, Liang Liu, Shaohai Chen, Chenghang Zhou, Jianwei Chai, Ping Yang, Kian Ping Loh, John Wang, Wanjun Jiang, Aurelien Manchon, Hongxin Yang, Jingsheng Chen
Summary: Van der Waals materials have attracted attention in spintronics due to their unique physical properties. This study reports the observation of current-induced spin-orbit torque (SOT) in the h-BN/SrRuO3 bilayer structure, where the vdW material is an insulator with negligible SOC. The strong SOT is capable of inducing perpendicular magnetization switching in SrRuO3, and calculations suggest a giant Rashba effect at the interface between vdW material and SrRuO3 thin film.
ADVANCED MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Wouter Mortelmans, Stefan De Gendt, Marc Heyns, Clement Merckling
Summary: The application of new materials in nanotechnology, particularly 2D chalcogenides, holds promise for groundbreaking innovations in the semiconductor industry. However, the integration of these materials poses challenges, limiting their usage to research laboratories. Achieving epitaxial growth of large-area, single-crystalline 2D chalcogenides is crucial for meeting industry demands.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Multidisciplinary
Haonan Ling, Jacob B. Khurgin, Artur R. Davoyan
Summary: Layered van der Waals materials provide unique atomic-void channels with subnanometer dimensions, offering opportunities for advanced applications such as sensing and quantum information. Theoretical limits of light guiding in these channels show that materials with strong resonances, excitonic and polaritonic properties are ideal for deeply subwavelength light guiding. Transition metal dichalcogenides with excitonic properties can concentrate over 70% of optical power within them.
Review
Chemistry, Multidisciplinary
Xiankun Zhang, Yanzhe Zhang, Huihui Yu, Hang Zhao, Zhihong Cao, Zheng Zhang, Yue Zhang
Summary: As silicon-based electronic devices face challenges of material performance decrease and interface quality degradation, ultrathin 2D materials are considered as potential candidates in future electronics due to their atomically flat surfaces and excellent immunity to short-channel effects. By freely stacking and forming high-quality heterostructure interfaces, all-2D electronics based on 2D van der Waals (vdW) interfaces can exhibit more comprehensive functionality and better performance. However, improving the compatibility of 2D material devices with silicon-based industrial technology remains a critical challenge.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Qian Chen, Weiming Lv, Shangkun Li, Wenxing Lv, Jialin Cai, Yonghui Zhu, Jiachen Wang, Rongxin Li, Baoshun Zhang, Zhongming Zeng
Summary: By inserting a monolayer MoTe2 with low crystal symmetry into Pt/Ni heterostructures, the spin orbit efficiency, out-of-plane magnetic anisotropy, and Gilbert damping of Ni have been enhanced due to orbital hybridization and increased spin scattering at the interface. Additionally, an out-of-plane damping-like torque is observed when the current is applied perpendicular to the mirror plane of the MoTe2 crystal, attributed to interfacial inversion symmetry breaking. This work offers a route for engineering SOT in Pt-based heterostructures and potential opportunities for van der Waals interfaces in spintronic devices.
Article
Chemistry, Multidisciplinary
Hongrui Zhang, Xiang Chen, Tianye Wang, Xiaoxi Huang, Xianzhe Chen, Yu-Tsun Shao, Fanhao Meng, Peter Meisenheimer, Alpha N'Diaye, Christoph Klewe, Padraic Shafer, Hao Pan, Yanli Jia, Michael F. Crommie, Lane W. Martin, Jie Yao, Ziqiang Qiu, David A. Muller, Robert J. Birgeneau, Ramamoorthy Ramesh
Summary: This study reports the experimental observation of spin-orbit torque magnetization self-switching at room temperature in a layered polar ferromagnetic metal, Fe2.5Co2.5GeTe2, providing a direct pathway towards applicable 2D spintronic devices.
ADVANCED MATERIALS
(2023)
Article
Quantum Science & Technology
Thow Min Cham, Saba Karimeddiny, Vishakha Gupta, Joseph A. Mittelstaedt, Daniel C. Ralph
Summary: Spin-orbit torques generated by exfoliated layers of low-symmetry semi-metal ZrTe3 are measured using the spin-torque ferromagnetic resonance (ST-FMR) technique. It was found that artifacts may affect the standard ST-FMR analysis within a certain thickness range. Accurate measurements can be achieved by using different methods to avoid this interference.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Review
Chemistry, Multidisciplinary
Iosif Tantis, Smita Talande, Vasileios Tzitzios, Georgia Basina, Vishal Shrivastav, Aristides Bakandritsos, Radek Zboril
Summary: This review focuses on recent advances in electrochemical energy storage (EES) technologies related to 2D crystals originating from non-layered 3D solids (non-van der Waals; nvdW) and their influence on the materials' features. The methods and challenges in top-down and bottom-up strategies towards nvdW 2D sheets and their applications in EES are discussed. Moreover, the opportunities and challenges of nvdW 2D systems in various applications are highlighted.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Xiantong Yu, Xin Wang, Feifan Zhou, Junle Qu, Jun Song
Summary: 2D van der Waals heterojunctions are a novel type of metamaterial that are flexible, adjustable, and easy to assemble. By combining different 2D materials and stacking methods, they can exhibit more abundant optical properties and have made significant progress in the field of nanophotonic devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hideki Matsuoka, Stewart Edward Barnes, Jun'ichi Ieda, Sadamichi Maekawa, Mohammad Saeed Bahramy, Bruno Kenichi Saika, Yukiharu Takeda, Hiroki Wadati, Yue Wang, Satoshi Yoshida, Kyoko Ishizaka, Yoshihiro Iwasa, Masaki Nakano
Summary: This research presents strong out-of-plane magnetic anisotropy at the interface between two different vdW materials, and proposes a simple model to explain the observations. These results demonstrate a new magnetic proximity effect at the vdW interface, expanding the horizons of emergent phenomena achievable in vdW heterostructures.
Article
Chemistry, Multidisciplinary
Rasmus H. Godiksen, Shaojun Wang, T. Raziman, Marcos H. D. Guimaraes, Jaime Gomez Rivas, Alberto G. Curto
Article
Materials Science, Multidisciplinary
C. F. Schippers, H. J. M. Swagten, M. H. D. Guimaraes
PHYSICAL REVIEW MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Marielle J. Meijer, Juriaan Lucassen, Rembert A. Duine, Henk J. M. Swagten, Bert Koopmans, Reinoud Lavrijsen, Marcos H. D. Guimaraes
Article
Physics, Applied
S. Omar, M. Gurram, K. Watanabe, T. Taniguchi, M. H. D. Guimaraes, B. J. van Wees
PHYSICAL REVIEW APPLIED
(2020)
Article
Nanoscience & Nanotechnology
Jorge Quereda, Jan Hidding, Talieh S. Ghiasi, Bart J. van Wees, Caspar H. van der Wal, Marcos H. D. Guimaraes
Summary: The study revealed the impact of Schottky contacts on CPC, showing that additional contributions are allowed when Schottky barriers are present in the device, resulting in the emergence of CPC under normal incidence illumination.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Nanoscience & Nanotechnology
F. Hendriks, M. H. D. Guimaraes
Summary: The magneto-optic Kerr effect is a powerful tool for measuring magnetism in thin films at microscopic scales. Thin-film interference can be used to engineer the magneto-optical signals of 2D magnetic materials and optimize them for a given experiment or setup, resulting in a higher sensitivity and shorter measurement times.
Review
Materials Science, Multidisciplinary
Adam J. Watson, Wenbo Lu, Marcos H. D. Guimaraes, Meike Stohr
Summary: Two-dimensional materials provide opportunities for exploring fundamental science and applications at atomic thickness limits. The family of 2D semiconductors, particularly the group-VI transition metal dichalcogenides (TMDs), have attracted attention for their potential in high on-off ratio transistors and optoelectronic devices. Methods for transferring 2D films, especially those grown by chemical vapor deposition (CVD), are crucial for further investigation and improvement of device performance.
Article
Physics, Applied
Rafael R. Rojas-Lopez, Juliana C. Brant, Maira S. O. Ramos, Tulio H. L. G. Castro, Marcos H. D. Guimaraes, Bernardo R. A. Neves, Paulo S. S. Guimaraes
Summary: The integration of MoS2 with GaAs results in a significant decrease in emission intensity of MoS2, with a dependence on the type of substrates observed in the trion to A-exciton emission ratio in photoluminescence spectra. Scanning Kelvin probe microscopy measurements suggest type-I band alignments, indicating the transfer of excitons from the MoS2 monolayer to the GaAs substrate. Overall, these findings shed light on the charge exchange leading to band offsets in 2D/3D heterojunctions and its implications for electronic devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Arunesh Roy, Marcos H. D. Guimaraes, Jagoda Slawinska
Summary: This study investigates unconventional spin Hall effects that occur in low-symmetry crystals and can be induced by breaking the crystal symmetries using an external electric field. Based on symmetry analysis, crystal structures that exhibit unusual charge-to-spin conversion were identified. Density functional theory calculations were performed to confirm the findings and demonstrate the controllable spin injection and detection using electric fields.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tom Lichtenberg, Casper F. Schippers, Sjoerd C. P. van Kooten, Stijn G. F. Evers, Beatriz Barcones, Marcos H. D. Guimaraes, Bert Koopmans
Summary: Femtosecond laser-pulse excitation allows for efficient control of magnetization at the nanoscale, offering potential for next-generation data manipulation and nonvolatile storage devices. This study investigates the magnetization dynamics of Fe3GeTe2 under laser-pulse excitation and finds an increased spin-flip probability.
Correction
Materials Science, Multidisciplinary
Jan Hidding, Sytze H. Tirion, Jamo Momand, Alexey Kaverzin, Maxim Mostovoy, Bart J. van Wees, Bart J. Kooi, Marcos H. D. Guimaraes
JOURNAL OF PHYSICS-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rafael R. Rojas-Lopez, Freddie Hendriks, Caspar H. van der Wal, Paulo S. S. Guimaraes, Marcos H. D. Guimaraes
Summary: Semiconductor transition metal dichalcogenides (TMDs) exhibit equivalent dynamics for their two spin/valley species, which is due to the energy-degenerated spin states connected through time-reversal symmetry. Application of an out-of-plane magnetic field breaks the time-reversal symmetry and leads to different bandgaps and dynamics in the K + - 2. The magnetic field can control the light-induced spin accumulation in the two valley states, with minimal effect on recombination lifetimes.
Article
Materials Science, Multidisciplinary
Tian Liu, Arunesh Roy, Jan Hidding, Homayoun Jafari, Dennis K. de Wal, Jagoda Slawinska, Marcos H. D. Guimaraes, Bart J. van Wees
Summary: The recently reported BMR effect in novel materials provides new possibilities for studying spin textures. In this study, the crystallographic dependence of BMR in thin WTe2 layers is investigated, revealing a threefold symmetry contribution of the BMR effect.
Article
Materials Science, Multidisciplinary
Jan Hidding, Sytze H. Tirion, Jamo Momand, Alexey Kaverzin, Maxim Mostovoy, Bart J. Van Wees, Bart J. Kooi, Marcos H. D. Guimaraes
Summary: There is no clear consensus on the microscopic origin of the spin-orbit torques observed in TMD/ferromagnet bilayers. Thickness-dependent SOT measurements on WSe2/permalloy bilayers reveal a large out-of-plane torque, a smaller in-plane torque, and a strong in-plane magnetic anisotropy induced in permalloy by the underlying WSe2 crystal, indicating a strong interplay between the ferromagnet and TMD with potential implications for non-volatile magnetic devices.
JOURNAL OF PHYSICS-MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Carmem M. Gilardoni, Freddie Hendriks, Caspar H. van der Wal, Marcos H. D. Guimaraes
Summary: Transition metal dichalcogenides (TMDs) exhibit interesting optical and spintronic properties due to their large spin-orbit coupling and crystal symmetries, allowing for potential development of novel optospintronic devices. Different spin-scattering processes are found in monolayer and bilayer TMDs, with distinct behaviors of electrons and holes leading to unique spin lifetimes. The presence of hidden spin polarization within each layer in bilayer and bulk TMDs enables external control of the spin lifetime through an out-of-plane electric field.