Article
Materials Science, Multidisciplinary
Man Yang, Bingfeng Miao, Jun Cheng, Kang He, Xi Yang, Yulun Zeng, Ziqiang Wang, Liang Sun, Xiangrong Wang, Antonio Azevedo, Subhankar Bedanta, Haifeng Ding
Summary: This study reports spin-charge conversion in perpendicular magnetized Co/Pd multilayers, observing the anomalous inverse spin Hall effect (AISHE) and finding that the sign and magnitude of AISHE can be regulated by the magnetization of the multilayers.
Article
Materials Science, Multidisciplinary
Yao Zhang, Yuefeng Yin, Guy Dubuis, Tane Butler, Nikhil V. Medhekar, Simon Granville
Summary: In this study, thin films of Weyl semimetal Co2MnGa are demonstrated to exhibit a large anomalous Hall angle at both low temperature and room temperature, making them promising for room temperature topo-spintronics applications. However, a significant decrease in the anomalous Hall angle is observed with decreasing thickness.
NPJ QUANTUM MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jie Chen, Xing Xu, Hang Li, Tengyu Guo, Bei Ding, Peng Chen, Hongwei Zhang, Xuekui Xi, Wenhong Wang
Summary: Controlling the anomalous Hall effect in magnetic topological materials is crucial, as observed in this study where the magnetic field influenced the anomalous Hall resistivity and the sign change in Weyl semimetal HoPtBi. Further analysis revealed that this effect originated from the field-induced shift of the Weyl points via exchange splitting of bands near the Fermi level, demonstrating a large tunable effect of the magnetic field on the electronic band structure.
Article
Materials Science, Multidisciplinary
Yong-Chang Lau, Junya Ikeda, Kohei Fujiwara, Akihiro Ozawa, Jiaxin Zheng, Takeshi Seki, Kentaro Nomura, Liang Du, Quansheng Wu, Atsushi Tsukazaki, Koki Takanashi
Summary: Magnetic Weyl semimetals exhibit chiral Weyl node pairs and large intrinsic anomalous Hall effect. This study demonstrates the potential of Dirac nodes in paramagnetic state for efficient spin current generation at room temperature via the spin Hall effect.
Article
Materials Science, Multidisciplinary
Md Shahin Alam, Amar Fakhredine, Mujeeb Ahmad, P. K. Tanwar, Hung -Yu Yang, Fazel Tafti, Giuseppe Cuono, Rajibul Islam, Bahadur Singh, Artem Lynnyk, Carmine Autieri, Marcin Matusiak
Summary: We present experimental results on the anomalous Hall effect and the anomalous Nernst effect in the noncollinear Weyl semimetal CeAlSi. The anomalous Hall conductivity was measured for two different orientations of the magnetic field, and the results show that they have opposite signs. The origin of this sign difference is attributed to the reconstruction of the band structure under the variation of the spin orientation. We also observed anomalous contribution in the Nernst conductivity, and its temperature dependence is explained using a toy model based on nonzero Berry curvature near the Weyl node.
Article
Multidisciplinary Sciences
Fei Wang, Xuepeng Wang, Yi-Fan Zhao, Di Xiao, Ling-Jie Zhou, Wei Liu, Zhidong Zhang, Weiwei Zhao, Moses H. W. Chan, Nitin Samarth, Chaoxing Liu, Haijun Zhang, Cui-Zu Chang
Summary: This study reports a sign change in the anomalous Hall effect resulting from Berry curvature change at the interface of a topological insulator/magnetic topological insulator heterostructure.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Haiyang Gu, Jianjun Tian, Chaoyang Kang, Longsheng Wang, Rui Pang, Mengna Shen, Kai Liu, Limin She, Yeheng Song, Xiansheng Liu, Weifeng Zhang
Summary: A sign change in the anomalous Hall effect (AHE) is observed in Cr2.63V0.25Te4 single crystals. The material exhibits bad metal behavior below 178 K with strong electron correlation. A sharp magnetic transition is observed at this temperature. The linear Hall resistivity suggests p-type conductivity for bulk Cr2.63V0.25Te4. The AHE coefficient is negative between 3-60 K and positive between 100-180 K, indicating a change in AHE mechanism due to Fermi level crossing the overlap of 3d band in ferromagnetic transition-metal materials.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Maoxiang Fu, Qiang Cao, Jiahui Liu, Kun Zhang, Guolei Liu, Shishou Kang, Yanxue Chen, Shishen Yan, Lihui Bai, Liangmo Mei, Zhen-Dong Sun
Summary: An unconventional carrier-dependent anomalous Hall effect is reported in ferromagnetic semiconductor (ZnCo)O films, exhibiting a quadratic scaling relation. The separation of the effect from the nonlinear ordinary Hall effect is shown to be necessary for proper scaling. Interestingly, a quadratic scaling relation between anomalous Hall conductivity and longitudinal conductivity is obtained.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yi-Fan Zhao, Ling-Jie Zhou, Fei Wang, Guang Wang, Tiancheng Song, Dmitry Ovchinnikov, Hemian Yi, Ruobing Mei, Ke Wang, Moses H. W. Chan, Chao-Xing Liu, Xiaodong Xu, Cui-Zu Chang
Summary: The study utilized molecular beam epitaxy (MBE) to grow MnBi2Te4 films of various thicknesses and observed a nonsquare hysteresis loop in films with a thickness greater than 2 septuple layers (SL). The hysteresis loop was found to consist of two anomalous Hall (AH) components, one from the dominant MnBi2Te4 phase and the other from the minor Mn-doped Bi2Te3 phase. The AH component extracted from the MnBi2Te4 phase exhibited clear even-odd layer-dependent behavior.
Article
Chemistry, Physical
Yongcheng Deng, Runze Li, Xionghua Liu
Summary: Research shows that even thin Mn3Sn films as thin as 20 nm exhibit a significant anomalous Hall effect, which varies depending on the relative crystalline structure of different thickness samples. Additionally, a phase diagram of the AHE in Mn3Sn films annealed at different temperatures with different thicknesses was obtained, and current-induced antiferromagnetic state switching was achieved in Mn3Sn (20 nm) / Pt (4 nm) samples. These findings could potentially advance the development of antiferromagnetic spintronics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Byungmin Sohn, Eunwoo Lee, Se Young Park, Wonshik Kyung, Jinwoong Hwang, Jonathan D. Denlinger, Minsoo Kim, Donghan Kim, Bongju Kim, Hanyoung Ryu, Soonsang Huh, Ji Seop Oh, Jong Keun Jung, Dongjin Oh, Younsik Kim, Moonsup Han, Tae Won Noh, Bohm-Jung Yang, Changyoung Kim
Summary: Magnetism and spin-orbit coupling play crucial roles in topological transport phenomena in itinerant ferromagnets. Two-dimensional systems may have stable nodal structures, and perovskite oxides generally support symmetry-protected nodal lines and points in their spin-polarized band structures.
Article
Physics, Applied
Huimin Han, Ying Sun, Kewen Shi, Xiuliang Yuan, Jie Ren, Jin Cui, Dongmei Hu, Kaiqi Zhang, Cong Wang
Summary: This study observed the anomalous Hall effect in an antiperovskite film and discovered an unusual sign reversal in the Hall measurements. The reversal was found to be caused by a magnetic transition occurring at around 240K. These findings are significant for effectively controlling magnetic configuration and innovative applications in spintronic memory devices.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ze-Yu Zhang, Jia-Wei Jiang, Xiao-Hui Shi, Xiang Liu, Xia Chen, Zhi-Peng Hou, Wen-Bo Mi
Summary: The spin-dependent transport properties of Pt/Mn4N bilayers on MgO (001) substrates have been systematically investigated. The results show that the Hall resistivity of the bilayers is strongly dependent on temperature, applied current intensity, Mn4N and Pt layer thicknesses. The temperature-dependent sign reversal of the anomalous Hall resistivity is dominated by the competition between the magnetic proximity and spin Hall effects. Furthermore, the magnitude of the anomalous Hall resistivity can be manipulated by applied current density.
Article
Chemistry, Multidisciplinary
Yazhou Deng, Ziji Xiang, Bin Lei, Kejia Zhu, Haimen Mu, Weizhuang Zhuo, Xiangyu Hua, Mingjie Wang, Zhengfei Wang, Guopeng Wang, Mingliang Tian, Xianhui Chen
Summary: This study reports the layer-number-dependent magnetotransport properties in the 2D ferromagnet Fe5GeTe2. It is found that the ferromagnetism changes from soft to hard upon thinning, and a perpendicular easy-axis anisotropy is achieved in bilayer flakes. The monolayer flakes exhibit spin-glass-like behavior. These results demonstrate the tunability of magnetotransport properties in atomically thin van der Waals magnets, which holds promise for engineering high-performance spintronic devices.
Article
Chemistry, Multidisciplinary
Jianhua Cui, Bin Lei, Mengzhu Shi, Ziji Xiang, Tao Wu, Xianhui Chen
Summary: This study investigates the thickness-dependent magnetic properties in exfoliated MnBi4Te7 thin flakes. An obvious odd-even layer-number effect is observed in few-layer MnBi4Te7. Noticeably, a sign reversal of the anomalous Hall effect is shown in monolayer MnBi4Te7. Compared to MnBi2Te4, the interlayer antiferromagnetic exchange coupling, which is essential for the realization of the quantum anomalous Hall effect, is greatly suppressed in MnBi4Te7. The demonstration of thickness-dependent magnetic properties is helpful for further exploring the topological quantum phenomena in MnBi4Te7.
Article
Materials Science, Multidisciplinary
Harish K. Singh, Amit Sehrawat, Chen Shen, Ilias Samathrakis, Ingo Opahle, Hongbin Zhang, Ruiwen Xie
Summary: We use density functional theory (DFT) and atomistic spin dynamics (ASD) simulations to predict stable magnetic half-antiperovskites (HAPs) M3X2Z2 and evaluate their thermodynamical and mechanical stabilities. The magnetic ground states are obtained by combining DFT calculations with ASD simulations. We have found 23 compounds stabilized at non-collinear antiferromagnetic (AFM) state and 11 compounds with ferromagnetic (FM) order out of 930 HAP compositions considered.
Article
Chemistry, Multidisciplinary
Mahdad Mohammadi, Ruiwen Xie, Niloofar Hadaeghi, Aldin Radetinac, Alexey Arzumanov, Philipp Komissinskiy, Hongbin Zhang, Lambert Alff
Summary: This study demonstrates that the absorption and reflection edges of SrV1-xMoxO3 solid solution can be shifted to the edges of the visible light spectrum, making it a potential alternative to indium tin oxide (ITO) with extremely low sheet resistance. The optimum composition with x = 0.5 shows a resistivity of 32 mu omega cm and transmittance above 84% across the visible spectrum. The shift of the plasma frequency is governed by the interplay of d-band filling and electronic correlations. This research contributes to the understanding of highly conducting perovskites for sustainable transparent conductors and emergent plasmonics.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
E. Santos, J. E. Abrao, Dongwook Go, L. K. de Assis, Yuriy Mokrousov, J. B. S. Mendes, A. Azevedo
Summary: In this study, experimental evidence of strong inverse orbital torque in YIG/Pt/CuOx is reported, which is mediated by spin-orbital mixed electronic states in Pt. By injecting spin current from YIG to Pt, a pronounced inverse spin Hall effect-like signal is observed. The signal is partially explained by the inverse spin-orbital Hall effect in Pt, but a substantial increase is also found in YIG/Pt/CuOx structures compared to YIG/Pt, which is attributed to the inverse orbital Rashba-Edelstein effect at the Pt/CuOx interface mediated by the spin-orbital coupled states in Pt. This work contributes to the understanding of spin-orbital intertwined physics in nonequilibrium and provides a way for electrical detection of the orbital current in orbitronic device applications.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Hiroki Hayashi, Daegeun Jo, Dongwook Go, Tenghua Gao, Satoshi Haku, Yuriy Mokrousov, Hyun-Woo Lee, Kazuya Ando
Summary: Modern spintronics relies on the generation of spin currents through spin-orbit coupling. The spin-current generation has been believed to be triggered by current-induced orbital dynamics, which governs the angular momentum transfer from the lattice to the electrons in solids. The fundamental role of the orbital response in the angular momentum dynamics suggests the importance of the orbital counterpart of spin currents: orbital currents. Here, we demonstrate the generation of giant orbital currents and uncover fundamental features of the orbital response.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Dongwook Go, Daegeun Jo, Kyoung-Whan Kim, Soogil Lee, Min-Gu Kang, Byong-Guk Park, Stefan Bluegel, Hyun-Woo Lee, Yuriy Mokrousov
Summary: Contrary to the common assumption, the orbital response in ferromagnets can exhibit remarkable long-ranged behavior, even in the presence of strong crystal field potential and orbital quenching. By studying a bilayer structure composed of a nonmagnet and a ferromagnet, it is found that induced orbital angular momentum can extend far beyond the spin dephasing length, even when an external electric field is applied only on the nonmagnet. This behavior is attributed to nearly degenerate orbital characters imposed by crystal symmetry, which form hotspots for the intrinsic orbital response. The findings suggest the potential use of long-range orbital response in orbitronic device applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Metallurgy & Metallurgical Engineering
Kun Hu, Chen Shen, Hua-shan Liu, Hong-bin Zhang
Summary: The phase equilibria of the Zr-Co-Ge ternary system were measured at different temperatures using alloy sampling combined with EPMA and XRD techniques. The isothermal sections were constructed, confirming previously reported ternary compounds and discovering a new ternary phase. The study also deduced an invariant reaction and found that Ge can substitute Co in some Co-Zr intermediate phases.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Chemistry, Multidisciplinary
Nuno M. Fortunato, Andreas Taubel, Alberto Marmodoro, Lukas Pfeuffer, Ingo Ophale, Hebert Ebert, Oliver Gutfleisch, Hongbin Zhang
Summary: Magnetic refrigeration is an efficient and eco-friendly alternative to traditional vapor-cooling, but its implementation relies on materials with tailored magnetic and structural properties. This study introduces a high-throughput computational workflow for designing magnetocaloric materials, using density functional theory calculations to screen potential candidates in the MM'X compound family (M/M' = metal, X = main group element). Out of 274 stable compositions, 46 magnetic compounds are found to stabilize in both austenite and martensite phases. By evaluating and comparing the structural phase transition and magnetic ordering temperatures, nine compounds with structural transitions are identified as potential candidates based on the concept of the Curie temperature window. Additionally, the use of doping to tailor magnetostructural coupling and isostructural substitution as a general approach to engineer magnetocaloric materials is suggested.
Article
Chemistry, Physical
Yixuan Zhang, Ruiwen Xie, Teng Long, Damian Guenzing, Heiko Wende, Katharina J. Ollefs, Hongbin Zhang
Summary: X-ray absorption spectroscopy (XAS) is a well-established method for characterizing electronic structure. We propose an Adversarial Bayesian optimization (ABO) algorithm that combines active learning to efficiently fit many-body model Hamiltonians and sample points. Using NiO as an example, we demonstrate that less than 30 sampling points can recover the complete XAS and corresponding models. Experimental XAS spectra analysis also shows that less than 80 sampling points provide reasonable XAS and reliable atomic model parameters. Our ABO algorithm has great potential for automated physics-driven XAS analysis and active learning sampling in the future.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ruijuan Yan, Chen Shen, Marc Widenmeyer, Ting Luo, Robert Winkler, Esmaeil Adabifiroozjaei, Ruiwen Xie, Songhak Yoon, Emmanuelle Suard, Leopoldo Molina-Luna, Hongbin Zhang, Wenjie Xie, Anke Weidenkaff
Summary: The density functional theory (DFT) calculations and experiments have confirmed that the 3d elements occupying the B position in ABC-type half-Heusler compounds are natural over-stoichiometry. In this work, Cu interstitial defects are intentionally introduced to optimize the electrical and thermal transport properties of ZrNiSn compound. The correlations between the phase structure, microstructure, and thermoelectric properties of ZrNiCuxSn (x = 0-0.20) are investigated using various techniques.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Chen Shen, Mian Dai, Xingxing Xiao, Niloofar Hadaeghi, Wenjie Xie, Anke Weidenkaff, Terumasa Tadano, Hongbin Zhang
Summary: We investigate the role of quartic anharmonicity in lattice dynamics and thermal transport of cubic EuTiO3 using ab initio self-consistent phonon theory, compressive sensing techniques, and experimental thermal conductivity measurement. We find that the strong quartic anharmonicity of oxygen atoms plays an important role in phonon quasiparticles free from imaginary frequencies in EuTiO3 and causes the hardening of vibrational frequencies of soft modes. The calculated thermal conductivity of 8.2 W/mK at 300 K matched the experimental value of 6.1 W/mK, and considering boundary scattering improved the agreement with the experiment to 6.9 W/mK at 300 K.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Kun Hu, Ruiwen Xie, Chen Shen, Hailong Peng, Huashan Liu, Hongbin Zhang
Summary: In this study, high-throughput density functional theory calculations were performed on Co-based Heusler alloys. The calculations validated with 65 experimentally known cases and predicted 158 novel compounds. All-d metal Heuslers were found to have different hybridization characteristics compared to conventional Heuslers, and the Slater-Pauling rule was found to accurately describe the relationship between magnetic properties and valence electrons. In addition, magneto-crystalline anisotropy was calculated for stable tetragonal compounds.
Article
Chemistry, Multidisciplinary
Chen Shen, Tianshu Li, Yixuan Zhang, Ruiwen Xie, Teng Long, Nuno M. Fortunato, Fei Liang, Mian Dai, Jiahong Shen, Christopher M. Wolverton, Hongbin Zhang
Summary: Chalcogenides, particularly ternary chalcogenides, have potential applications in optoelectronics, thermoelectrics, transparent contacts, and thin-film transistors. Despite the relatively low number of successfully synthesized compounds, there are numerous unexplored chalcogenides with fascinating physical characteristics. In this study, a systematic high-throughput screening process combined with first-principles calculations was implemented to study ternary chalcogenides and generate a large computational material database. Machine learning models were used to predict the thermodynamic stability of novel materials, and the electronic structures and performance of stable candidates were evaluated.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Ziyuan Rao, Yue Li, Hongbin Zhang, Timoteo Colnaghi, Andreas Marek, Markus Rampp, Baptiste Gault
Summary: Computational methods and machine learning algorithms are crucial for automatic information extraction in materials science. A machine learning-based approach working directly on original periodic atom arrangements shows high accuracy and tolerance to random displacements and missing atoms. This approach successfully reconstructs ordered L12 precipitates and advances crystal structure identification for incomplete data.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
M. Merte, F. Freimuth, D. Go, T. Adamantopoulos, F. R. Lux, L. Plucinski, O. Gomonay, S. Bluegel, Y. Mokrousov
Summary: In this study, first principles methods are used to explore the physics of charge photocurrents, spin photocurrents, and the inverse Faraday effect in antiferromagnetic Mn2Au. The emergence of large spin photocurrents and the possibility of tracking the dynamics of staggered moments during switching are predicted. It is also suggested that even a small canting in Mn2Au can give rise to colossal chiral spin photocurrents. The unique blend of prominent photocurrents in Mn2Au makes it a unique platform for advanced optospintronics applications.
Article
Chemistry, Physical
Niels Kubitza, Ruiwen Xie, Ivan Tarasov, Chen Shen, Hongbin Zhang, Ulf Wiedwald, Christina S. Birkel
Summary: By microwave heating, we have successfully synthesized a previously unknown MAX phase solid-solution (V1-x Cr x )(2)GaC, which exhibits a crucial coupling between chemical composition and electronic structure, providing important guidelines for the synthesis of long-range ordered magnetic MAX phases.
CHEMISTRY OF MATERIALS
(2023)