Article
Chemistry, Multidisciplinary
Federico Binda, Stefano Fedel, Santos Francisco Alvarado, Paul Noel, Pietro Gambardella
Summary: The study investigates the spin-orbit torques (SOTs) and spin Hall magnetoresistance generated by Bi0.9Sb0.1(0001) when coupled with FeCo, confirming its effectiveness as a spin-injector material. The research finds that charge-to-spin conversion in single-crystal Bi0.9Sb0.1(0001) is isotropic despite the strong anisotropy of the topological surface states. Additionally, the damping-like SOT displays non-monotonic temperature dependence, with a minimum occurring at 20 K.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Wen-Bin Wu, Julia Kasiuk, Janusz Przewoznik, Czeslaw Kapusta, Ivan Svito, Dang Thanh Tran, Hung Manh Do, Hung Manh Dinh, Johan Akerman, Thi Ngoc Anh Nguyen
Summary: We studied the magnetoresistance mechanisms in a Pt/[Co/Pt]x5 film consisting of a ferromagnetic [Co/Pt]x5 layer with strong perpendicular magnetic anisotropy and a nonmagnetic Pt layer with strong spin-orbit coupling. Two competing contributions, sin2 theta and cos4 theta, were revealed in the electrical resistance of the film at different angles and magnetic fields, corresponding to the out-of-plane rotation of the magnetization M(theta) perpendicularly to the electric current. The cos4 theta contribution is attributed to the anisotropic magnetoresistance of the ferromagnetic layer, while the sin2 theta contribution is mainly associated with the spin Hall magnetoresistance originating from the Pt layer. The strong influence of the electric current on the magnetization of the film is of high relevance for magnetic memory design technologies.
APPLIED SURFACE SCIENCE
(2024)
Article
Physics, Applied
Longjie Yu, Shutaro Karube, Min Liu, Masakiyo Tsunoda, Mikihiko Oogane, Yasuo Ando
Summary: Non-collinear antiferromagnets possess topological spin structure, allowing for the manipulation of charge-spin conversion. In this study, we investigate the unconventional spin-orbit torque of L1(2)-ordered Mn3Pt with a triangular spin structure.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Salvatore Teresi, Nicolas Sebe, Jessy Patterson, Theo Frottier, Aurelie Kandazoglou, Paul Noel, Paolo Sgarro, Damien Terebenec, Nicolas Bernier, Francoise Hippert, Jean-Philippe Attane, Laurent Vila, Pierre Noe, Maxen Cosset-Cheneau
Summary: Driving a spin-logic circuit requires a large output signal generated by spin-charge interconversion in spin-orbit readout devices. However, obtaining high-quality topological insulators compatible with conventional industrial deposition processes remains challenging. In this study, a spin-orbit readout device made of the topological insulator Sb2Te3 deposited by large-scale industrial magnetron sputtering on SiO2 is fabricated, and a significant output voltage attributed to spin-charge interconversion is measured. These results offer a path towards integrating layered van der Waals materials in spin-logic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yevhen Zabila, Marta Marszalek, Michal Krupinski, Arkadiusz Zarzycki, Marcin Perzanowski
Summary: This study prepared semi-metallic bismuth thin films by thermal evaporation, observing stabilization of grain size at 140 nm and continuous decrease of resistivity with increasing thickness. Annealing the films at temperatures close to the melting point of Bi led to a significant increase in magnetoresistance at room temperature and in a 7T magnetic field.
Article
Materials Science, Multidisciplinary
N. Hu, Y. K. Weng, K. Chen, B. You, Y. Liu, Y. T. Chang, R. Xiong, S. Dong, C. L. Lu
Summary: In this work, the authors investigate the strain effect on the physical properties of Sr2IrO4 thin films. The film on LaAlO3 substrate with compressive strain has a lower antiferromagnetic transition temperature compared to the film on SrTiO3 substrate with tensile strain. First principles calculations reveal that epitaxial strain plays a role in tuning the canting angle of J(eff) = 1/2 moments, which affects the magnetoresistance of the films. The film on LaAlO3 has higher magnetocrystalline anisotropy energy, causing difficulties in reaching the metastable state and explaining the distinct anisotropic magnetoresistance between the two samples.
MATERIALS TODAY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zhao-Cai Wang, Lei Chen, Shuang-Shuang Li, Jing-Shi Ying, F. Tang, Guan-Yin Gao, Y. Fang, Weiyao Zhao, David Cortie, Xiaolin Wang, Ren-Kui Zheng
Summary: Linear magnetoresistance (LMR) is observed in half-metallic perovskite Sr2CrMoO6 thin films, with a maximum MR value exceeding +1600%, possibly due to high carrier density and ultrahigh mobility. This unusual behavior in ferrimagnetic double perovskite materials may broaden the applications of perovskites and stimulate research on metallic oxide ferri-/ferro-magnetic materials.
NPJ QUANTUM MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yuhan Liang, Dingsong Jiang, Yahong Chai, Yue Wang, Hetian Chen, Jing Ma, Pu Yu, Di Yi, Tianxiang Nan
Summary: In this study, we observed magnon spin transport through multiferroic BiFeO3 thin films in a spin pumping experiment at room temperature. The experimental results showed that the magnon spin transport efficiency is very high when the thickness of the BiFeO3 films exceeds 80 nm.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiashu Wang, William Powers, Zhan Zhang, Michael Smith, Bradlee J. McIntosh, Seul Ki Bac, Logan Riney, Maksym Zhukovskyi, Tatyana Orlova, Leonid P. Rokhinson, Yi-Ting Hsu, Xinyu Liu, Badih A. Assaf
Summary: This study investigates the behavior of candidate topological superconductor Sn1-xInxTe thin films in the presence of quantum confinement and lattice strain. The results reveal the coexistence of quantum interference effects and superconducting fluctuations above the critical temperature T-c. The analysis of normal state magnetoresistance indicates a transition from weak antilocalization to localization in the superconducting samples, suggesting that superconductivity primarily originates from charge carriers occupying trivial states. Additionally, a significant enhancement of conductivity is observed above T-c, indicating the presence of superconducting fluctuations.
Article
Chemistry, Multidisciplinary
Jiashu Wang, William Powers, Zhan Zhang, Michael Smith, Bradlee J. McIntosh, Seul Ki Bac, Logan Riney, Maksym Zhukovskyi, Tatyana Orlova, Leonid P. Rokhinson, Yi-Ting Hsu, Xinyu Liu, Badih A. Assaf
Summary: Research on strained Sn1-xInxTe thin films grown in the (111) plane reveals the potential hosting of Majorana zero modes and the existence of quantum interference effects and superconducting fluctuations in conductivity. The study also shows a crossover from weak antilocalization to localization in superconducting samples, indicating that superconductivity may mainly originate from charge carriers in strongly spin-orbit split trivial states. The observed significant increase in conductivity above T-c suggests the presence of superconducting fluctuations in the material.
Article
Chemistry, Multidisciplinary
Sachin Krishnia, Yanis Sassi, Fernando Ajejas, Nicolas Sebe, Nicolas Reyren, Sophie Collin, Thibaud Denneulin, Andras Kovacs, Rafal E. Dunin-Borkowski, Albert Fert, Jean-Marie George, Vincent Cros, Henri Jaffres
Summary: By inserting a nanometer-thin Al metallic layer in Pt|Co|Al|Pt, we demonstrate that a light metal interface profoundly affects the nature of spin-orbit torques and its efficiency in ultrathin Co films. The unexpectedly large H(FL)/H(DL) ratios suggest the existence of a large Rashba interaction at the Co|Al interface, which is not expected from a metallic interface. The occurrence of enhanced torques from an interfacial origin is further validated by demonstrating current-induced magnetization reversal with a significant decrease in the critical current.
Article
Multidisciplinary Sciences
Machiel Flokstra, Rhea Stewart, Chi-Ming Yim, Christopher Trainer, Peter Wahl, David Miller, Nathan Satchell, Gavin Burnell, Hubertus Luetkens, Thomas Prokscha, Andreas Suter, Elvezio Morenzoni, Irina V. Bobkova, Alexander M. Bobkov, Stephen Lee
Summary: The study found that spin-triplet pair correlations can be generated in a simple structure without the use of ferromagnetic elements. By observing the local electronic and magnetic properties, it was confirmed that the spin-orbit generated magnetization comes from equal-spin pairs rather than their orbital motion.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Rui-Hao Li, Pengtao Shen, Steven S-L Zhang
Summary: We theoretically demonstrate that class-I topological Dirac semimetals can provide a platform for electrically and magnetically tunable spin-charge conversion, with significant tunability and high efficiency.
Article
Nanoscience & Nanotechnology
Martin Testa-Anta, Charles-Henri Lambert, Can Onur Avci
Summary: Spin-orbit torques (SOTs) in heavy metal (HM)/magnetic insulator (MI) bilayers attract increasing attention due to their tunable magnetic properties and insulating nature. However, accurate determination of SOTs in MIs is limited by low electrical signals and dominant spurious thermoelectric effects. A simple method based on harmonic Hall voltage detection and macrospin simulations is reported, accurately quantifying the damping-like and field-like SOTs, and thermoelectric contributions separately in MI-based systems. This method yields precise values for SOTs in the Bi-doped YIG/Pt heterostructure and reveals the influence of current-induced Joule heating on spin transparency and SOTs.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dongchao Yang, Lizhi Yi, Shuaiwei Fan, Xiaogang He, Yunli Xu, Min Liu, Linjie Ding, Liqing Pan, John Q. Xiao
Summary: The challenge in quantitatively determining the spin Seebeck effect in ferromagnetic metals lies in the presence of various other thermoelectric signals, including the anomalous Nernst effect, magnetic proximity-induced ANE, and inverse spin Hall effect. By comparing different material layers and conducting model-assisted analyses, the pure spin Seebeck signals and coefficients of various ferromagnetic metals can be accurately determined. Understanding the properties of spin-related effects in ferromagnetic metals is crucial, and experimental measurements combined with theoretical calculations offer valuable insights into these phenomena.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Hao Li, Yali Yang, Shiqing Deng, Hui Liu, Tianyu Li, Yuzhu Song, He Bai, Tao Zhu, Jiaou Wang, Huanhua Wang, Er-Jia Guo, Xianran Xing, Hongjun Xiang, Jun Chen
Summary: Regulating the magnetic properties of multiferroics enables their potential application in spintronic devices. By utilizing oxygen defect engineering, we significantly enhanced the room temperature ferromagnetism of a representative ferrite, EuFeO3. Our findings suggest that the decrease in Fe-O-Fe bond angles caused by oxygen vacancies strengthens magnetic interactions and tilts Fe spins, leading to an approximately five-fold increase in saturation magnetization. Furthermore, we established the internal relationship between magnetism and oxygen vacancies by illustrating how magnetic structure and magnitude change with varying vacancy configuration and concentration. This strategy for regulating magnetic properties has broad applicability to various functional oxide materials.
Article
Materials Science, Multidisciplinary
Fengliang Liu, Yiqing Hao, Jinyang Ni, Yongsheng Zhao, Dongzhou Zhang, Gilberto Fabbris, Daniel Haskel, Shaobo Cheng, Xiaoshan Xu, Lifeng Yin, Hongjun Xiang, Jun Zhao, Xujie Lu, Wenbin Wang, Jian Shen, Wenge Yang
Summary: Hexagonal LuFe2O4 exhibits various charge-ordered phases with different magnetic orders under external pressure. The redistribution of charge density induced by pressure in the frustrated double-layer [Fe2O4] cluster is responsible for the correlated spin-charge phase transitions. Enhanced Coulomb interactions among Fe-Fe bonds drive the frustrated charge order into a less frustrated charge order, leading to the transition from ferrimagnetism to antiferromagnetism. This study not only elucidates the coupling mechanism among charge, spin, and lattice degrees of freedom in LuFe2O4, but also provides a new approach for tuning spin-charge orders.
NPJ QUANTUM MATERIALS
(2023)
Article
Chemistry, Physical
Huimin Zhang, Yang Zhong, Chuying Ouyang, Xingao Gong, Hongjun Xiang
Summary: Layered LiMO2 (M = Co, Ni, and Mn) materials with distinctive layer structure are commonly used as cathode materials in lithium-ion batteries. In this study, a detailed investigation of LiNiO2, LiMnO2, and a half-doped material LiNi0.5Mn0.5O2 is performed using first-principles calculations and Monte Carlo simulations. The results reveal the most stable zigzag-type structure of LiNiO2 and different magnetic ground states in these three systems. The competition between short-range and long-range spin exchange interactions leads to a spiral order in LiNiO2, while the collinear antiferromagnetic state in LiMnO2 is determined by its nearest and next-nearest neighbor antiferromagnetic spin exchange interactions. On the other hand, the collinear ferrimagnetic state in LiNi0.5Mn0.5O2 is attributed to the ferromagnetic exchange interactions between nearest neighbor Ni-Ni and Mn-Mn pairs. This work demonstrates the relevance of different exchange interactions in these cathode materials to the performance of lithium-ion batteries.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Junyi Ji, Guoliang Yu, Changsong Xu, H. J. Xiang
Summary: In this paper, a theory of bilayer stacking ferroelectricity (BSF) is proposed, which explains the ferroelectric behavior in stacked layers of the same 2D material with different rotation and translation. The theory is supported by group theory analysis and first-principles simulations, and it provides a new perspective and a solid foundation for designing a variety of bilayer ferroelectrics. The study also highlights the potential application of manipulating the electric polarization in the bilayer.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Jiabin Chen, Yang Li, Hongyu Yu, Yali Yang, Heng Jin, Bing Huang, Hongjun Xiang
Summary: Controlling magnetic properties using optical stimulation is not only interesting from a physics perspective, but also significant for practical applications like magneto-optical devices. Based on a simple tight-binding model, a general theory of light-induced magnetic phase transition in antiferromagnets is proposed, which has been confirmed by first-principles calculations on 2D van der Waals antiferromagnetic materials. The theory provides a new approach to manipulate 2D magnetism with high speed and superior resolution.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Multidisciplinary Sciences
Shaomian Qi, Di Chen, Kangyao Chen, Jianqiao Liu, Guangyi Chen, Bingcheng Luo, Hang Cui, Linhao Jia, Jiankun Li, Miaoling Huang, Yuanjun Song, Shiyi Han, Lianming Tong, Peng Yu, Yi Liu, Hongyu Wu, Shiwei Wu, Jiang Xiao, Ryuichi Shindou, X. C. Xie, Jian-Hao Chen
Summary: Researchers discovered that giant electrically tunable anisotropy in the transport of second harmonic thermal magnons can be achieved in the van der Waals antiferromagnetic insulator CrPS4 with modest gate current. Taking advantage of this large and tunable anisotropy, they demonstrated multi-bit read-only memories based on the anisotropy of magnon transport in CrPS4.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Wenjie Hu, Zefeng Zhang, Yanghui Liao, Qiang Li, Yang Shi, Huanyu Zhang, Xumeng Zhang, Chang Niu, Yu Wu, Weichao Yu, Xiaodong Zhou, Hangwen Guo, Wenbin Wang, Jiang Xiao, Lifeng Yin, Qi Liu, Jian Shen
Summary: Artificial spin ices are arrays of small magnets arranged in a lattice, which have been studied for their effective magnetic monopoles and potential for neuromorphic computing. In this study, Hu et al. successfully distinguished different spin states of artificial spin ice using transport measurements.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Jiabin Zhang, Weichao Yu, Xiheng Chen, Jiang Xiao
Summary: Micromagnetic simulation is a numerical method for solving the LLG equation in magnetic dynamics. A COMSOL-based micromagnetic simulation module is developed using the frequency domain simulation capability of COMSOL Multiphysics, which is faster and more accurate than time-domain simulations. The module is validated using three examples in the absence of dipolar field and can be combined with the AC/DC module within COMSOL for including the dipolar field.
Article
Multidisciplinary Sciences
Zhizhong Zhang, Kelian Lin, Yue Zhang, Arnaud Bournel, Ke Xia, Mathias Klaeui, Weisheng Zhao
Summary: This study proposes a neural network based on magnon scattering modulated by an omnidirectional mobile hopfion in antiferromagnets. The states of neurons are encoded in the frequency distribution of magnons, and the connections between them are related to the frequency dependence of magnon scattering. By controlling the hopfion's state, hyperparameters in the network can be modulated, realizing the first verified well-functioning meta-learning device. This research not only breaks the connection density bottleneck but also provides a guideline for future designs of neuromorphic devices.
Article
Chemistry, Physical
Yang Zhong, Hongyu Yu, Xingao Gong, Hongjun Xiang
Summary: In this study, we propose a new framework called edge-based tensor prediction graph neural network that addresses the incompatibility of traditional invariant GNNs with directional properties. By expressing tensors as linear combinations of local spatial components projected on the edge directions of clusters with varying sizes, our framework is rotationally equivariant and satisfies the symmetry of local structures. We demonstrate the accuracy and universality of our framework by successfully predicting various tensor properties from first to third order. This work enables GNNs to step into the broad field of prediction of directional properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Xuanyi Li, Changsong Xu, Boyu Liu, Xueyang Li, L. Bellaiche, Hongjun Xiang
Summary: A realistic first-principle-based spin Hamiltonian is constructed for the type-II multiferroic NiI2, which includes single ion anisotropy, isotropic Heisenberg terms, Kitaev interaction, and a biquadratic term. The model can reproduce the experimental helical ground state features and establish the relationship between Kitaev interaction and the multiferroicity of NiI2. Additionally, Monte Carlo simulations reveal three equivalent domains and different topological defects.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yingwei Chen, Yali Yang, Changsong Xu, Hongjun Xiang
Summary: In this paper, a method of constraining spin directions by imposing a local parallel magnetic field is proposed. It is found that this method is more efficient in constraining spin directions than existing methods.
Article
Materials Science, Multidisciplinary
Lei Wang, Tai Min, Ke Xia
Summary: The abnormal scaling law of the anomalous Hall effect in L12-type Mn3X (X = Ir, Pt, Rh) is found to originate from a two-center scattering (TCS) contribution using a first-principles-based scattering wave-function approach in this study. The TCS contribution dominates the anomalous Hall effect in noncollinear antiferromagnetic metals, with the anomalous Hall conductivity being as large as & sigma;H <^> 5 x 104 (0 cm)-1 in L12-type Mn3Ir at low temperature, which is two orders of magnitude larger than the current Berry curvature calculations.
Article
Materials Science, Multidisciplinary
Y. D. Sun, Lei Wang, Lili Lang, Ke Xia, S. M. Zhou
Summary: We investigated the hysteresis and training effect of spin current in Pt/Y3Fe5O12 heterostructures under successive cycles of ionic liquid gate voltage Vg. The diode-like behaviors of inverse spin Hall effect voltage and spin Hall magnetoresistance in spin pumping during the first half cycle of Vg, as well as the hysteresis in the first cycle of Vg, become weak and disappear in the second cycle due to the training effect. This study provides valuable insights into enhancing the functional performance of electrically controlled spin current devices.
Article
Optics
Shaojie Yuan, Chuanpu Liu, Jilei Chen, Song Liu, Jin Lan, Haiming Yu, Jiansheng Wu, Fei Yan, Jiang Xiao, Liang Jiang, Dapeng Yu
Summary: Recent progress in quantum computing and simulation based on superconducting qubits has entered the noisy intermediate-scale quantum (NISQ) era. This article proposes a hybrid system consisting of superconducting qubits and a yttrium iron garnet (YIG) system as an alternative way to achieve coupling for quantum information processing. Numerical simulations demonstrate coherent transfer of quantum information between the flux qubit and the standing spin waves in YIG thin films.
