Article
Materials Science, Multidisciplinary
E. Yuzuak, G. D. Yuzuak, I Ennen, A. Huetten
Summary: This study systematically investigated the properties of Tb(25)Fe(6)1Co(14) thin films and found that increasing the thickness of the Pt underlayer helped enhance the perpendicular magnetic anisotropy. It was also discovered that these films exhibited out-of-plane magnetic anisotropy even without annealing.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yangkun He, Simon Lenne, Zsolt Gercsi, Gwenael Atcheson, Jack O'Brien, Daniel Fruchart, Karsten Rode, J. M. D. Coey
Summary: This article investigates the spin structure of Mn4N films and its influence on the magnetotransport properties.
Article
Materials Science, Multidisciplinary
J. Gil-Monsalve, J. E. Abrao, E. Santos, A. Ricalde, A. Azevedo, O. Arnache
Summary: This study investigated the magnetic properties of ZnFe2O4 films grown on different substrates using ferromagnetic resonance (FMR) technique. The results showed that the anisotropy of the samples depends on the type of substrate. By analyzing the FMR data, various parameters related to the magnetic properties were extracted. The magnetic response obtained by FMR was compared with the results from a vibrating sample magnetometer.
Article
Chemistry, Physical
Himalay Basumatary, J. Arout Chelvane, D. V. Sridhara Rao, A. Talapatra, J. Mohanty, Deepak Kumar, Vajinder Singh, S. Kamat, Rajeev Ranjan
Summary: This study investigated the magnetic behavior of Tb-Fe thin films with different thicknesses, revealing the presence of out-of-plane magnetic anisotropy in these films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
A. Roman, A. Lopez Pedroso, K. Bouzehouane, J. E. Gomez, A. Butera, M. H. Aguirre, M. Medeiros Soares, C. Garcia, L. B. Steren
Summary: The competition between shape and perpendicular magnetic anisotropies in magnetic thin films leads to unconventional magnetic behaviors. In ferromagnetic thin films, the out-of-plane component of magnetic anisotropy can induce a transition from planar to stripe-like magnetic domains above a critical thickness, tc. This article presents a detailed study of the magnetization switching mechanism in FePt thin films where this phenomenon is observed. Micromagnetic simulations and experiments show that below tc, the reversal mechanism is well described by the two-phase model, while above this thickness, the magnetization within each stripe reverses through coherent rotation. The out-of-plane component and its temperature dependence of the magnetic anisotropy were also analyzed, indicating that substrate-induced strains are responsible for the abnormal coercive field behavior observed for FePt films with t > tc.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Siyue Zhang, Yu Miyazaki, Tomoyuki Yokouchi, Yuki Shiomi
Summary: We experimentally demonstrated the phase change control of Hall effects in ferromagnetic MnBi thin films at room temperature. Two distinct ferromagnetic phases were obtained using different cooling methods, and the Hall resistivity showed different characteristics between the two phases. By optimizing the ratio, the sign of the Hall resistivity can be repeatedly switched.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yuchen Ji, Zheng Liu, Peng Zhang, Lun Li, Shifei Qi, Peng Chen, Yong Zhang, Qi Yao, Zhongkai Liu, Kang L. Wang, Zhenhua Qiao, Xufeng Kou
Summary: We report the thickness-tailored quantum anomalous Hall (QAH) effect in Cr-doped (Bi,Sb)(2)Te-3thin films and demonstrate that the induced hybridization gap plays an indispensable role in determining the ground magnetic state of magnetic topological insulators (MTIs). This finding provides useful guidance for the pursuit of other QAH-based phase diagrams and functionalities through structural engineering.
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: The magnetic properties of rare earth-transition metal ferrimagnetic thin films are studied. It is found that the compensation of magnetic moments of rare earth and transition metal sublattices increases with decreasing film thickness. For thin TbFeCo films, Tb atoms do not contribute to the magnetization. The perpendicular magnetic anisotropy increases with a thin Co layer but drops to zero with a thin Tb layer. The Tb concentration at which magnetic compensation occurs decreases when the underlayer is changed from Pt to Ta.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Aleksei Grunin, Sergey Shevyrtalov, Ksenia Chichay, Olga Dikaya, Nadezhda Barkovskaya, Denis Danilov, Aleksander Goikhman
Summary: Thin Fe3Si films grown on Si/SiO2 substrates using ion-beam and pulsed laser deposition exhibit soft ferromagnetic behavior and strong in-plane uniaxial magnetic anisotropy. The presence and character of the anisotropy are not affected by the material of the capping layer or the deposition of the buffer layer. The structure of the Fe3Si film depends on the type of substrate used.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Xin Yu Zheng, Sanyum Channa, Lauren J. Riddiford, Jacob J. Wisser, Krishnamurthy Mahalingam, Cynthia T. Bowers, Michael E. McConney, Alpha T. N'Diaye, Arturas Vailionis, Egecan Cogulu, Haowen Ren, Zbigniew Galazka, Andrew D. Kent, Yuri Suzuki
Summary: This study introduces a ferromagnetic insulator spinel, Li0.5Al1.0Fe1.5O4 (LAFO), with low magnetic damping, perpendicular magnetic anisotropy, and no magnetic dead layer. By integrating these LAFO films with epitaxial Pt spin source layers, record low magnetization switching currents and high spin-orbit torque efficiencies are achieved.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Rebeca Ibarra, Edouard Lesne, Bushra Sabir, Jacob Gayles, Claudia Felser, Anastasios Markou
Summary: This work reports the structural, magnetic, and magnetotransport properties of crystalline hexagonal Heusler MnPtGa epitaxial thin films. The MnPtGa films exhibit preferential perpendicular magnetic anisotropy below the Curie temperature and undergo a spin reorientation transition at lower temperatures. The anomalous Hall conductivity of the films shows a nonmonotonic behavior as a function of temperature.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Physical
T. Fix, G. Schmerber, J. -l. Rehspringer, M. V. Rastei, S. Roques, J. Bartringer, A. Slaoui
Summary: In this study, TbMnO3 (TMO) powders were fabricated and doped with In, Lu, Gd, Sm, Nd, Y. It was found that In and Nd atoms significantly reduce the cell size while maintaining an orthorhombic structure. Epitaxially grown h-TMO, h-In-TMO, h-Y-TMO, and h-YMO were successfully obtained using pulsed laser deposition (PLD). The optical properties of the films showed a direct bandgap of 1.5-1.6 eV for h-TMO and doped h-TMO films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Tianyu Liu, Lvkang Shen, Shao-Dong Cheng, He Wang, Yixuan Li, Ming Liu
Summary: Inserting a graphene layer into magnetic oxide thin films can improve the linearity of the anomalous Hall effect, resulting in better performance and sensitivity for magnetic sensor applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Yunhe Bai, Yuanzhao Li, Jianli Luan, Ruixuan Liu, Wenyu Song, Yang Chen, Peng-Fei Ji, Qinghua Zhang, Fanqi Meng, Bingbing Tong, Lin Li, Yuying Jiang, Zongwei Gao, Lin Gu, Jinsong Zhang, Yayu Wang, Qi-Kun Xue, Ke He, Yang Feng, Xiao Feng
Summary: This study realized quantized anomalous Hall resistivity in MBE-grown MnBi2Te4 thin films by controlling the chemical potential and top gating. Post-annealing can increase the temperature for quantization but also increase the residual longitudinal resistivity.
NATIONAL SCIENCE REVIEW
(2023)
Article
Materials Science, Multidisciplinary
J. Geshev, A. M. H. de Andrade
Summary: Recent research has found that the recoil magnetization curves of Fe, Co, and Ni films lie entirely outside the major hysteresis loop, which is known as a recoil-curve overshoot. A model of exchange-coupled grains with misaligned anisotropy axes can reproduce key features of these films, such as the collapse of the hard-magnetization axis, enhanced remanent magnetization and coercivity, the recoil-curve overshoot, and kinks in major loops near saturation. In this study, an interaction plot technique is used to investigate the interactions influencing magnetization reversal.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wenrui Li, Haofei Zhao, Hao Li, Rongming Wang
Summary: Efficient and low-cost Fe-doped NiS nanosheets grown on conductive carbon fiber paper were fabricated through a two-step hydrothermal process for enhanced oxygen evolution reaction (OER) performance. The Fe-NiS@CFP catalyst exhibited superior electrocatalytic activity with low internal and interface charge-transfer resistance, leading to an overpotential of 275 mV at 100 mA cm(-2) and stable performance for at least 50 hours as an OER electrode. This work provides insights into the design and fabrication of non-noble metal sulfide electrocatalysts.
NANOSCALE ADVANCES
(2022)
Article
Physics, Applied
Zhe Guo, Ruofan Li, Shuai Zhang, Yufeng Tian, Jeongmin Hong, Long You
Summary: A recently discovered 3D magnetic field sensor based on grain reversal allows for linear modulation of magnetic field components in three directions with high linearity.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Tianyu Xia, Kai Zhao, Youqi Zhu, Xiaoyan Bai, Han Gao, Ziyu Wang, Yue Gong, Menglin Feng, Shunfang Li, Qiang Zheng, Shouguo Wang, Rongming Wang, Haizhong Guo
Summary: Mixed-dimensional Pt-Ni alloy polyhedral nanochains were fabricated to address the unbalanced relationship between activity and stability in Pt nanocatalysts. These nanochains exhibited significantly enhanced mass activity for methanol oxidation reaction and improved stability against CO poisoning. Additionally, they achieved a higher half-wave potential for oxygen reduction reaction.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xuejie Xie, Xiujuan Wang, Wei Wang, Xiaonan Zhao, Lihui Bai, Yanxue Chen, Yufeng Tian, Shishen Yan
Summary: In this study, the controllable manipulation of multiple spin configurations is achieved by controlling long-range oscillatory interlayer coupling and neighboring ferrimagnetic coupling. This is done by integrating the advantages of ferromagnetic, ferrimagnetic, and antiferromagnetic spin configurations into a synthetic antiferromagnetic (SAF) heterostructure.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Haofei Zhao, Yuchen Zhu, Huanyu Ye, Yang He, Hao Li, Yifei Sun, Feng Yang, Rongming Wang
Summary: Nanocrystals play a crucial role in material sciences and industry. Designing nanocrystals with desired structures and properties is a major challenge that requires a deep understanding of atomic-scale dynamics. In situ transmission electron microscopy (TEM), especially environmental TEM, has provided valuable insights into nanocrystals. This comprehensive review highlights the progress in the understanding of nanocrystal dynamics, including nucleation and growth, structure evolution, and dynamics in reaction conditions.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Xiang Han, Yibo Fan, Dong Wang, Wei Wang, Lihui Bai, Yanxue Chen, Shishen Yan, Yufeng Tian
Summary: A controllable field-free spin-orbit torque (SOT) switching is demonstrated in the Pt/IrMn/Co/Ru/CoPt/CoO/MgO heterojunction at room temperature, which allows for the control of in-plane exchange bias and perpendicular magnetization switching. Multiple spin logic operations and a spin logic half-adder are achieved using this controllable SOT switching, suggesting its potential for efficient spin logic and in-memory computing devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Yue Zhao, Ledong Wang, Xiang Han, Yufeng Tian, Shishen Yan, Qingjie Guo, Ya Zhai, Lihui Bai
Summary: In this work, the unique dispersion in the microwave transmission properties of the magnon-photon coupled system in the Purcell regime was studied using a Permalloy film and a superconducting cavity. It was found that the modulation of the coupled system can be achieved by varying the magnon dissipation rate. The researchers also demonstrated that the magnon-photon coupling can be enhanced by decreasing the magnon dissipation rate using a direct current.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yadi Cao, Yinghui Sun, Huanhuan Yang, Liang Zhou, Qianming Huang, Jiajie Qi, Pengfei Guan, Kaihui Liu, Rongming Wang
Summary: In this study, the directional migration and structural evolution of Au nanoparticles on anisotropic ReS2 were investigated using aberration-corrected transmission electron microscopy. It was found that Au nanoparticles with diameters below 3 nm preferentially migrate along the b-axis direction. Density functional theory calculations revealed that the lower diffusion energy barrier enables the directional migration. The coalescence kinetics of Au nanoparticles were quantitatively described using the relationship r(2) = Kt. This work provides an atomic-resolved dynamic analysis method for studying the interfacial structural evolution of metal/2D materials, which is crucial for understanding the stability of nanodevices based on mixed-dimensional nanomaterials.
Article
Materials Science, Multidisciplinary
Yu Zhang, Xue-Ai Teng, Ze-Qun Ma, Rong-Ming Wang, Woon-Ming Lau, Ai-Xian Shan
Summary: A novel synthesis strategy for FeOOH hollow tubes with one-dimensional and hollow features was proposed and successfully implemented. The FeOOH scaly hollow tubes exhibited outstanding catalytic activity, low Tafel slope, and robust stability as oxygen evolution reaction catalysts. This work enhances the feasibility to broaden the design ideas of transition metal-based catalysts.
Article
Chemistry, Multidisciplinary
Xiaoyan Bai, Tianqi Cao, Tianyu Xia, Chenxiao Wu, Menglin Feng, Xinru Li, Ziqing Mei, Han Gao, Dongyu Huo, Xiaoyan Ren, Shunfang Li, Haizhong Guo, Rongming Wang
Summary: Constructing a heterogeneous interface using different components is an effective way to achieve the bifunctionality of nanocatalysts, and synergistic interactions between multiple interfaces can optimize the performance of single-interface nanocatalysts. A multiple-interfaced sandwich-like nanostructure MoS2/NiSe2/reduced graphene oxide (rGO) is prepared, showing excellent catalytic performance in water splitting reactions. Assembled into a modified two-electrode system, the nanostructures exhibit an overpotential even exceeding that of noble metal nanocatalysts.
Article
Nanoscience & Nanotechnology
Xiaonan Zhao, Xiujuan Wang, Yanan Dong, Wei Wang, Lihui Bai, Yanxue Chen, Shishou Kang, Shishen Yan, Yufeng Tian
Summary: In the field of information hardware security, the use of purely electrical controllable spin-orbit torque in heterojunctions enables the realization of reconfigurable physical unclonable functions (rPUFs). By controlling the exchange bias and the switching polarity of magnetized CoPt in a single device, four different rPUF states can be achieved. The variation in critical switching current density allows for the development of rPUF devices with good uniqueness and low bit error rate. This work provides an approach to information hardware security and expands the application of spintronics.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Xiaodan Wang, Yao Lu, Rui Li, Dongsheng Ren, Xiaoyue Wang, Chunxue Liu, Rongming Wang, Xiang Hu, Zhenhai Wen, Xiangming He
Summary: This study reports a superlattice Zn3V2O7-C as a conversion-type cathode material for AZIBs, which exhibits high capacity and long-term stability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yuan Ma, Yongqing Chen, Tao Guo, Hong-Hui Wu, Rongming Wang, Yang He, Luning Wang, Lijie Qiao
Summary: In this study, the atomic shuffling mechanism during twinning nucleation in rhenium nanocrystals was analyzed using in situ high-resolution transmission electron microscopy. It was found that the double-layered prismatic planes initially shuffle into single-layered BCT planes, and subsequently adjacent BCT planes shuffle in opposite directions to form the basal planes of the twin embryo. Molecular dynamic simulations further confirmed this shuffling mechanism. These findings provide direct evidence of shuffle-dominated twinning nucleation with atomic details, which may contribute to better control of this critical twinning mode in HCP metals.
Article
Chemistry, Multidisciplinary
Shiyu Zhu, Yun Liu, Yue Gong, Yuting Sun, Kang Chen, Yuan Liu, Weidi Liu, Tianyu Xia, Qiang Zheng, Han Gao, Haizhong Guo, Rongming Wang
Summary: PtCo@PtIr nanoparticles with a quasi-octahedral PtCo nanocrystal core and an ultrathin PtIr atomic layer shell are successfully designed and fabricated. With their unique geometric and core-shell features, the PtCo@PtIr nanoparticles exhibit significantly higher mass and specific activities as an ORR catalyst compared to a commercial Pt/C catalyst, and show extraordinary durability. Furthermore, when evaluated with the ORR-OER dual reaction, the PtCo@PtIr nanoparticles demonstrate a small ORR-OER overpotential gap, indicating their great potential as a bifunctional electrocatalyst for fuel cell applications.
Article
Chemistry, Multidisciplinary
QiKun Huang, Senmiao Liu, Tianxiang Yang, Ronghuan Xie, Li Cai, Qiang Cao, Weiming Lu, Lihui Bai, Yufeng Tian, Shishen Yan
Summary: This study demonstrates, for the first time, the current-induced magnetic-field-free in-plane magnetization reversal in CoFeB/CuOx bilayers, indicating that light metals can play an equally important role as heavy metals in magnetization reversal.
