Article
Chemistry, Multidisciplinary
Chunlei Li, Yaojin Li, Yifan Zhao, Yujing Du, Meng Zhao, Wanjun Peng, Yangyang Wu, Ming Liu, Ziyao Zhou
Summary: This study demonstrates a ferromagnetic/photovoltaic heterojunction that exhibits controllable magnetic dynamics under visible light illumination, offering a new approach for the development of fast, small, and energy-efficient spintronics applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
C. Guarcello, F. S. Bergeret, R. Citro
Summary: This study investigates the switching current distributions of ferromagnetic anomalous Josephson junctions under a linearly increasing bias current and uncovers a significant correlation between the position of the switching current distributions and crucial system parameters such as the strength of the spin-orbit coupling and the Gilbert damping parameter. By conducting a comprehensive analysis of the interplay among noise, magnetization, phase dynamics, and the statistical properties of the switching current distribution, a deeper understanding of these intriguing cryogenic spintronics devices is achieved.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Joscha Detzmeier, Kevin Koeniger, Tomasz Blachowicz, Andrea Ehrmann
Summary: Micromagnetic simulations on sputtered nanoparticles with different structures at zero temperature reveal that small deviations in systems due to random anisotropy orientations in different grains can lead to significant deviations in magnetization reversal processes and hysteresis loops, as well as distinctly asymmetric, horizontally shifted hysteresis loops in purely ferromagnetic nanoparticles.
Article
Materials Science, Multidisciplinary
H. J. Waring, Y. Li, C. Moutafis, I. J. Vera-Marun, T. Thomson
Summary: Researchers have found that synthetic ferromagnets have a unique layer structure, where the dynamic response of the ferromagnetic layers is closely related to the difference in magnetization and interlayer coupling. Experimental results demonstrate that conventional acoustic and optical descriptions do not fully capture the complexities of synthetic ferromagnets' dynamics.
Article
Nanoscience & Nanotechnology
Yuxin Cheng, Yaojin Li, Guohua Dong, Bin Peng, Ziyao Zhou, Ming Liu
Summary: The key concept in flexible/freestanding spintronics involves effectively controlling ultra-thin film magnetism while ensuring that functional properties are not compromised when gating methods are applied. By coupling the freestanding characteristic with important magnetic properties, it is possible to expand the storage area of freestanding spintronics. This work demonstrates the feasibility of tunable flexible spintronics through freestanding mechanisms and showcases the promising future of freestanding spintronics.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
Hassan Al-Hamdo, Tobias Wagner, Yaryna Lytvynenko, Gutenberg Kendzo, Sonka Reimers, Moritz Ruhwedel, Misbah Yaqoob, Vitaliy I. Vasyuchka, Philipp Pirro, Jairo Sinova, Mathias Klaeui, Martin Jourdan, Olena Gomonay, Mathias Weiler
Summary: We investigated the magnetization dynamics of Mn2Au/Py thin film bilayers and found two resonant modes that are attributed to the coupling between Py and Mn2Au.
PHYSICAL REVIEW LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Fanghua Tian, Xiaoqin Ke, Kaiyan Cao, Dingchen Wang, Qizhong Zhao, Jianing Li, Zhiyong Dai, Dong Wang, Yin Zhang, Chao Zhou, Yu Wang, Wenliang Zuo, Minxia Fang, Sen Yang
Summary: The properties of materials are heavily influenced by the size of domains/grains, showing a non-monotonic relationship. In bulk Ni2Mn1+xGa1-x alloys, the exchange bias effect is influenced by the size of ferromagnetic clusters and can be regulated by changing the density of the FM/AFM interface.
Article
Nanoscience & Nanotechnology
Yaroslav V. Turkin, Nataliya Pugach
Summary: The main goal of this work is to describe the dynamics of spin current and induced magnetization inside a superconducting film S in contact with a ferromagnetic insulator layer FI. The study calculates spin current and induced magnetization not only at the interface of the S/FI hybrid structure, but also inside the superconducting film. The predicted effect is the frequency dependence of the induced magnetization, with a maximum appearing at high temperatures. It is also shown that increasing the magnetization precession frequency can greatly change the spin distribution of quasiparticles at the S/FI interface.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Risto Ojajarvi, Tero T. Heikkila, P. Virtanen, M. A. Silaev
Summary: This study develops a theory of the spin battery effect in superconductor/ferromagnetic insulator systems, taking into account the magnetic proximity effect. The findings demonstrate that spin-energy mixing enabled by superconductivity can enhance spin accumulation by several orders of magnitude, leading to a giant inverse spin Hall effect. The study also suggests a nonlocal electrical detection scheme to probe the spin accumulation driven by magnetization dynamics, and predicts a giant Seebeck effect and enhanced sensitivity of magnon detection.
Article
Nanoscience & Nanotechnology
Manish Kumar Mohanta, I. S. Fathima, Amal Kishore, Abir De Sarkar
Summary: The research demonstrates that new 2D semiconductor materials, ZnTe and CdTe, with strong spin-orbit coupling and large Rashba constants, have a giant out-of-plane piezoelectric coefficient, which can be used to generate high piezo potential in spin field-effect transistors. The Rashba constants of these materials can be effectively modulated by external perturbations, and their wide band gap allows for ample room for modulation in electronic properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Can Wang, Dongmei Niu, Yao-zhuang Nie, Lin Li, Baoxing Liu, Shitan Wang, Haipeng Xie, Yongli Gao
Summary: The study conducted using photoemission spectroscopy revealed energy-level alignment and spin-polarized hybrid interface states between cobalt and rubrene. A spin polarization inversion was observed at the rubrene/Co(001) interface, attributed to chemical interaction between rubrene and Co(001), with implications for organic spintronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Xiao Liu, Haochen Yuan, Peiwen Liu, Jingyu Shi, Hailong Wang, Shuaihua Nie, Feng Jin, Zhe Zheng, Xuezhe Yu, Jianhua Zhao, Haibin Zhao, Gunter Luepke
Summary: Fast spin manipulation in magnetic heterostructures is crucial for the development of ultrafast spintronics. This study demonstrates ultrafast optically controlled interfacial exchange interactions in the ferromagnetic Co2FeAl/(Ga,Mn)As system. The results highlight the importance of interfacial exchange interactions in ferromagnetic heterostructures for ultrafast, low-power spin manipulation.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Liu Yang, Alejandro A. Jara, Zheng Duan, Andrew Smith, Brian Youngblood, Rodrigo E. Arias, Ilya N. Krivorotov
Summary: We conducted a joint experimental and theoretical study on the parametric resonance of spin-wave eigenmodes in Ni80Fe20/Pt bilayer nanowires. The spectrum of these eigenmodes in transversely magnetized nanowires was measured using electrically detected magnetic resonance, and their parametric excitation was investigated by a microwave magnetic field. An analytical theory taking into account magnetic dilution at the nanowire edges was developed to describe the spin-wave eigenmodes and their parametric excitation in the nanowire geometry. Our findings show good agreement between theory and experiment for parametric resonance of certain eigenmodes, but significant discrepancies were observed for the edge modes. It was discovered that the ellipticity of the edge modes was lower than expected, which could be attributed to strong modification of magnetism at the nanowire edges.
Article
Chemistry, Multidisciplinary
Andrew Ritchhart, Zhihengyu Chen, Agnish Behera, Ie-Rang Jeon, Karena W. Chapman, Suriyanarayanan Vaikuntanathan, John S. Anderson
Summary: This study reports the synthesis of a pseudo-1D coordination polymer material and investigates its magnetic behavior. The material exhibits a continuous and isomorphous alloy structure, and shows spin glass magnetic behavior at lower Fe loadings. The magnetic behavior is well-modeled by simulation. These findings highlight the importance of coordination polymers and MOF frameworks in tuning physical properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Igor Rozhansky, Ina Kalitukha, Grigorii S. Dimitriev, Olga S. Ken, Mikhail Dorokhin, Boris N. Zvonkov, Dmitri S. Arteev, Nikita S. Averkiev, Vladimir L. Korenev
Summary: Hybrid structures combining ferromagnetic and semiconductor constituents have great potential for future applications in spintronics. A systematic approach to study spin-dependent transport in a GaMnAs/GaAs/InGaAs quantum well hybrid structure is developed, using spin electromotive force measurements and photoluminescence detection. This method provides a powerful tool for studying the properties of such hybrid structures and can be applied to other systems, including 2D van der Waals materials.
Article
Chemistry, Multidisciplinary
Rebekah Chua, Jans Henke, Surabhi Saha, Yuli Huang, Jian Gou, Xiaoyue He, Tanmoy Das, Jasper van Wezel, Anjan Soumyanarayanan, Andrew T. S. Wee
Summary: Thinning crystalline materials to two dimensions leads to a variety of electronic phases, but the confinement of charge order to only 2D remains challenging. By studying monolayer VSe2, two CDWs with distinct origins were discovered, highlighting the importance of emergent interactions in 2D materials.
Article
Chemistry, Multidisciplinary
Shan Lin, Zhiwen Wang, Qinghua Zhang, Shengru Chen, Qiao Jin, Hongbao Yao, Shuai Xu, Fanqi Meng, Xinmao Yin, Can Wang, Chen Ge, Haizhong Guo, Chi Sin Tang, Andrew T. S. Wee, Lin Gu, Kui-juan Jin, Hongxin Yang, Er-Jia Guo
Summary: This study demonstrates the synthesis of high-quality single-phase chromium oxynitride thin films using in-situ nitrogen doping, which exhibits robust ferromagnetic and insulating state. By increasing nitrogen content, the crystal structure changes and saturation magnetization decreases significantly. The authors also achieve a large and controllable exchange bias field in the chromia heterostructures through synthetic anion engineering, reflecting potential applications in modern magnetic sensors and read heads.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Qiao Jin, Zhiwen Wang, Qinghua Zhang, Yonghong Yu, Shan Lin, Shengru Chen, Mingqun Qi, He Bai, Amanda Huon, Qian Li, Le Wang, Xinmao Yin, Chi Sin Tang, Andrew T. S. Wee, Fanqi Meng, Jiali Zhao, Jia-Ou Wang, Haizhong Guo, Chen Ge, Can Wang, Wensheng Yan, Tao Zhu, Lin Gu, Scott A. Chambers, Sujit Das, Timothy Charlton, Michael R. Fitzsimmons, Gang-Qin Liu, Shanmin Wang, Kui-Juan Jin, Hongxin Yang, Er-Jia Guo
Summary: Heterointerfaces play an important role in the discovery of novel electronic and magnetic states. This study successfully synthesized and characterized Cr2O3-CrN superlattices and observed room-temperature ferromagnetic spin ordering at the interfaces between these two antiferromagnets. The findings provide insights into the unexpected properties of oxide-nitride interfaces and offer possibilities for exploring hidden phases in low-dimensional quantum heterostructures.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
S. W. Zeng, X. M. Yin, C. J. Li, L. E. Chow, C. S. Tang, K. Han, Z. Huang, Y. Cao, D. Y. Wan, Z. T. Zhang, Z. S. Lim, C. Z. Diao, P. Yang, A. T. S. Wee, S. J. Pennycook, A. Ariando
Summary: Nickel-based complex oxides have been widely studied as a possible analog of high-temperature superconductors. The recent discovery of superconductivity in infinite-layer nickelate thin films has provided important insights into the mechanism of high-temperature superconductivity. However, challenges still remain in material synthesis, perfect diamagnetism has not been directly demonstrated, and the role of interface and strain in the superconducting properties is not well understood.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jia-Xuan Tang, Pei-Hao Wang, Yu-Rong You, Ya-Dong Wang, Zhan Xu, Zhi-Peng Hou, Hong-Guo Zhang, Gui-Zhou Xu, Feng Xu
Summary: The magnetic and electrical transport properties of hexagonal noncollinear ferromagnetic MnFeGe alloy were systematically studied, revealing the presence of abnormal M-type magnetoresistance (MR) in the low-field region, which is related to magnetic domain change and the formation of labyrinth domain and sparse bubbles.
Article
Chemistry, Multidisciplinary
Dingguan Wang, Zishen Wang, Wei Liu, Arramel, Siying Zhong, Yuan Ping Feng, Kian Ping Loh, Andrew Thye Shen Wee
Summary: The study investigates molecular clusters formed on Au(111) with diverse halogen bonds, revealing the presence of three distinct halogen bonds among the clusters. The real-space atomic information of these clusters is acquired using non-contact atomic force microscopy and low-temperature scanning tunneling microscopy.
Article
Nanoscience & Nanotechnology
Yang Chen, Shuhang Qian, Kai Wang, Xiangyuan Xing, Andrew Wee, Kian Ping Loh, Bing Wang, Dong Wu, Jiaru Chu, Andrea Alu, Peixiang Lu, Cheng-Wei Qiu
Summary: Valleytronics, a promising technology for energy-efficient signal transport on chip, faces challenges in achieving high-fidelity, high-directionality, and room-temperature valley transport. In this study, a nanophotonic circuit is demonstrated to unidirectionally route valley indices using the chirality of photons, with 98% valley fidelity and a circulation directionality of 0.44 +/- 0.04 at room temperature. This research opens up possibilities for large-scale valleytronic networks and hybrid spin-valley-photon ecosystems at the nanoscale.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Applied
Chi Sin Tang, Shengwei Zeng, Caozheng Diao, Jing Wu, Shunfeng Chen, Mark B. H. Breese, Chuanbing Cai, Thirumalai Venkatesan, Ariando Ariando, Andrew T. S. Wee, Xinmao Yin
Summary: The effects of atomic-scale disorder and charge (de)localization are of great importance in condensed matter systems and provide insights into the role of strong and weak correlations. In this study, researchers found that 2D free electrons were localized in the specific hybridized states at the LaAlO3/SrTiO3 interface. The localization of 2D electrons could be induced through temperature reduction or ionic liquid gating. Interfacial hybridization was found to play a crucial role in regulating the localization effects. This study not only highlights the importance of interfacial hybridization but also offers a new approach for device fabrication in amorphous film systems.
APPLIED PHYSICS REVIEWS
(2022)
Article
Physics, Applied
Zhan Xu, Grayson Dao Hwee Wong, Jiaxuan Tang, Er Liu, Birte Coester, Feng Xu, Leixiang Bian, Wen Siang Lew
Summary: We investigated the influence of ultrathin Ti insertion layer on the effective magnetic damping and effective spin Hall angle in Co/[Pt/Ti](n)/Pt structures through spin-torque ferromagnetic resonance measurements. The effective magnetic damping decreases initially and then increases with increasing number of insertion layers, reaching a minimum at n=5. The observed behavior can be attributed to the competition between increased longitudinal resistivity and reduced effective spin Hall conductivity due to the insertion layer. Additionally, we found that the interfacial spin transparency is improved with the presence of the insertion layer.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Liguo Zhou, Jiang Jiang, Wen Zhang, Ping Kwan Johnny Wong, Bin Xia, Dongwei Zhang, Xudong Bai, Xilong Lu
Summary: A folded half-wavelength microstrip resonator with a stepped impedance structure (FSIR) is designed to extend the second harmonic and affect the strength of the external electromagnetic coupling. The FSIRs of electromagnetic mutual cancellation structure and strong electric coupling structures are designed to realize the design of narrowband and broadband filters with extended second harmonic, respectively. A T-junction is designed to cascade the two high-order filters to achieve high isolation between two channels. The duplexer is fabricated on a single piece of 2-in double-sided YBCO (YBa2Cu3O7) thin film on an MgO substrate with a dimension of 34.86x26.30x0.50 mm(3), a thickness of 0.5 mm, and a dielectric constant of 9.8. At 77K, the measured central frequency of the duplexer are 910 and 1100 MHz, the fractional bandwidths are 2.19% and 18.18%, the out-of-band rejections are greater than 60 dB, the two second harmonic are located at 2.4 GHz and 2.5 GHz, the insertion loss is less than 0.20 dB, and the return losses are better than 16.1 dB and 17.2 dB. The test results of the duplexer are in good agreement with the simulated ones.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Chemistry, Multidisciplinary
Sheng Jiang, Sunjae Chung, Quang Tuan Le, Ping Kwan Johnny Wong, Wen Zhang, Johan Akerman
Summary: Exchange-spring STNOs are demonstrated to generate high-frequency microwave emission at zero magnetic field and observe magnetic droplet solitons. This extends the design flexibility and functionality of current STNO technology for energy-efficient high-frequency spintronics and neuromorphic applications.
Article
Multidisciplinary Sciences
Jian Gou, Hua Bai, Xuanlin Zhang, Yu Li Huang, Sisheng Duan, A. Ariando, Shengyuan A. Yang, Lan Chen, Yunhao Lu, Andrew Thye Shen Wee
Summary: Conventional ferroelectric compounds require at least two constituent ions for polarization switching. However, in a black phosphorus-like bismuth layer, a single-element ferroelectric state is observed, with concurrent ordered charge transfer and regular atom distortion between sublattices. The Bi atoms in the black phosphorous-like Bi monolayer exhibit a weak and anisotropic sp orbital hybridization, leading to the inversion-symmetry-broken buckled structure and charge redistribution. The in-plane electric polarization is induced in the Bi monolayer, which is experimentally visualized through scanning probe microscopy.
Article
Engineering, Electrical & Electronic
Yuntao Zhang, Leixiang Bian, Zhan Xu, Yong He
Summary: This paper presents a novel method for measuring weak magnetic fields using a magnetostrictive/piezoelectric composite. By exciting the composite with a step magnetic field, the magnetoelectric effect is significantly enhanced, and the weak magnetic field signal can be recovered using lock-in demodulation. The experiment achieved a sensitivity of 29.77 mV/Oe and a linearity error of 0.22% in the dc magnetic field, and a sensitivity of about 37.5 mV/Oe in the flat area of 1-50 kHz ac magnetic field.
IEEE SENSORS JOURNAL
(2023)
Letter
Multidisciplinary Sciences
T. J. Whitcher, A. D. Fauzi, C. Diao, X. Chi, A. Syahroni, T. C. Asmara, M. B. H. Breese, A. H. Castro Neto, A. T. S. Wee, M. A. Majidi, A. Rusydi
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Alfian Noviyanto, Ratih Amalia, Pramitha Yuniar Diah Maulida, Mudzakkir Dioktyanto, Bagas Haqi Arrosyid, Didik Aryanto, Lei Zhang, Andrew T. S. Wee, Arramel
Summary: In this study, manganese oxide nanoparticles were successfully synthesized using the hydrothermal method with different temperatures and NaOH concentrations. The results showed that temperature and NaOH concentration played important roles in determining the particle size, crystallinity, and oxygen vacancy occupancy of the manganese oxide nanoparticles.
