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Wu Y, Deng L, Yin X, Tong J, Tian F, Zhang X. Valley-Related Multipiezo Effect and Noncollinear Spin Current in an Altermagnet Fe 2Se 2O Monolayer. NANO LETTERS 2024; 24:10534-10539. [PMID: 39145607 DOI: 10.1021/acs.nanolett.4c02554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
An altermagnet exhibits many novel physical phenomena because of its intrinsic antiferromagnetic coupling and natural band spin splitting, which are expected to give rise to new types of magnetic electronic components. In this study, an Fe2Se2O monolayer is proven to be an altermagnet with out-of-plane magnetic anisotropy, and its Néel temperature is determined to be 319 K. The spin splitting of the Fe2Se2O monolayer reaches 860 meV. Moreover, an Fe2Se2O monolayer presents a pair of energy valleys, which can be polarized and reversed by applying uniaxial strains along different directions, resulting in a piezovalley effect. Under the strain, the net magnetization can be induced in the Fe2Se2O monolayer by doping with holes, thereby realizing a piezomagnetic property. Interestingly, noncollinear spin current can be generated by applying an in-plane electric field on an unstrained Fe2Se2O monolayer doped with 0.2 hole/formula unit. These excellent physical properties make the Fe2Se2O monolayer a promising candidate for multifunctional spintronic and valleytronic devices.
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Affiliation(s)
- Yanzhao Wu
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Li Deng
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Xiang Yin
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Junwei Tong
- Department of Physics, Freie Universität Berlin, Berlin 14195, Germany
| | - Fubo Tian
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Xianmin Zhang
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China
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Chen Y, Samanta K, Shahed NA, Zhang H, Fang C, Ernst A, Tsymbal EY, Parkin SSP. Twist-assisted all-antiferromagnetic tunnel junction in the atomic limit. Nature 2024; 632:1045-1051. [PMID: 39143222 PMCID: PMC11358014 DOI: 10.1038/s41586-024-07818-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 07/11/2024] [Indexed: 08/16/2024]
Abstract
Antiferromagnetic spintronics1,2 shows great potential for high-density and ultrafast information devices. Magnetic tunnel junctions (MTJs), a key spintronic memory component that are typically formed from ferromagnetic materials, have seen rapid developments very recently using antiferromagnetic materials3,4. Here we demonstrate a twisting strategy for constructing all-antiferromagnetic tunnel junctions down to the atomic limit. By twisting two bilayers of CrSBr, a 2D antiferromagnet (AFM), a more than 700% nonvolatile tunnelling magnetoresistance (TMR) ratio is shown at zero field (ZF) with the entire twisted stack acting as the tunnel barrier. This is determined by twisting two CrSBr monolayers for which the TMR is shown to be derived from accumulative coherent tunnelling across the individual CrSBr monolayers. The dependence of the TMR on the twist angle is calculated from the electron-parallel momentum-dependent decay across the twisted monolayers. This is in excellent agreement with our experiments that consider twist angles that vary from 0° to 90°. Moreover, we also find that the temperature dependence of the TMR is, surprisingly, much weaker for the twisted as compared with the untwisted junctions, making the twisted junctions even more attractive for applications. Our work shows that it is possible to push nonvolatile magnetic information storage to the atomically thin limit.
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Affiliation(s)
- Yuliang Chen
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | - Kartik Samanta
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE, USA
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Naafis A Shahed
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE, USA
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Haojie Zhang
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | - Chi Fang
- Max Planck Institute of Microstructure Physics, Halle, Germany
| | - Arthur Ernst
- Max Planck Institute of Microstructure Physics, Halle, Germany
- Institute of Theoretical Physics, Johannes Kepler University, Linz, Austria
| | - Evgeny Y Tsymbal
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE, USA
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE, USA
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Shu D, Wang D, Wang Y, Tang L, Chen K. Spin Polarization Enhances the Catalytic Activity of Monolayer MoSe 2 for Oxygen Reduction Reaction. Molecules 2024; 29:3311. [PMID: 39064890 PMCID: PMC11279673 DOI: 10.3390/molecules29143311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2024] [Revised: 07/10/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
The key factors in achieving high energy efficiency for proton exchange membrane fuel cells are reducing overpotential and increasing the oxygen reduction rate. Based on first-principles calculations, we induce H atom adsorption on 4 × 4 × 1 monolayer MoSe2 to induce spin polarization, thereby improving the catalytic performance. In the calculation of supercells, the band unfolding method is used to address the band folding effect in doped systems. Furthermore, it is evident from analyzing the unique energy band configuration of MoSe2 that a higher valley splitting value has better catalytic effects on the oxygen reduction reaction. We believe that the symmetries of the distinct adsorption site result in different overpotentials. In addition, when an even number of hydrogen atoms is adsorbed, the monolayer MoSe2 has no spin polarization. The spin can affect the electron transfer process and alter the hybrid energy with the reaction products, thereby regulating its catalytic performance.
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Affiliation(s)
- Dan Shu
- School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, China;
| | - Dan Wang
- Hunan Province Key Laboratory of Material Table Interface Science and Technology, School of Electronic Information and Physics, Central South University of Forestry and Technology, Changsha 410004, China;
| | - Yan Wang
- School of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Liming Tang
- School of Physics and Electronics, Hunan University, Changsha 410082, China; (L.T.); (K.C.)
| | - Keqiu Chen
- School of Physics and Electronics, Hunan University, Changsha 410082, China; (L.T.); (K.C.)
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Wang H, Liu J, Ju W, Xu X, Chen J. Nitrogen-doped hollow carbon sphere composite Mn 3O 4 as an advanced host for lithium-sulfur battery. Sci Rep 2024; 14:13714. [PMID: 38877113 PMCID: PMC11178808 DOI: 10.1038/s41598-024-64067-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Accepted: 06/05/2024] [Indexed: 06/16/2024] Open
Abstract
As the most promising advanced energy storage system, lithium-sulfur batteries (LSBs) are highly favored by the researchers because of their advantages of high energy density (2500 W h kg-1), low cost and non-pollution. However, the low conductivity, volume expansion of sulfur, and shuttle effect are still the great hindrance to the practical application of LSBs. Herein, the above problems can be addressed through the following strategies: (1) Hollow carbon microspheres with high specific surface area were constructed as sulfur hosts to increase sulfur loading while also being able to enhance the physical adsorption of polysulfides; (2) the loading of Mn3O4 particles on the basis of hollow carbon microspheres facilitates the capture and adsorption of polysulfides; (3) the hollow carbon sphere structure as a conductive network can provide more pathways for rapid electrical/ionic transport and also accelerate electrolyte wetting. Moreover, the thinner shell of hollow carbon microsphere is conducive to ion diffusion and speed up the reaction rate. Thus, the NHCS/Mn3O4/S composites exhibit a high discharge specific capacity of 1010.3 mAh g-1 at first and still maintained a reversible capacity of 269.2 mAh g-1 after 500 cycles. This work presents a facile sustainable and efficient synergistic strategy for the development of advanced LSBs.
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Affiliation(s)
- Haibin Wang
- School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang, 421002, China.
| | - Jun Liu
- School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang, 421002, China
| | - Wenqi Ju
- School of Materials Science and Engineering, Xiangtan University, Hunan, 411105, China
| | - Xupeng Xu
- School of Materials Science and Engineering, Xiangtan University, Hunan, 411105, China
| | - Jiwei Chen
- School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang, 421002, China
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Xu L, Li C, Xiong SX, Tang S, Xu Z, Cao L, Tao J, Zhang Y, Dong K, Wang LL. A bicomponent synergistic Mo xW 1-xS 2/aluminum nitride vdW heterojunction for enhanced photocatalytic hydrogen evolution: a first principles study. Phys Chem Chem Phys 2024; 26:2973-2985. [PMID: 38224019 DOI: 10.1039/d3cp05411j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2024]
Abstract
The coupling of two-dimensional van der Waals heterojunctions is an effective way to achieve photocatalytic hydrogen production. This paper designs the MoxW1-xS2/AlN (x = 0, 0.25, 0.5, 0.75, 1) van der Waals heterojunction as a possible photocatalytic material. By using first-principles calculations, the effects of different Mo/W ratios on the band gap and photocatalytic hydrogen production performance of heterojunctions were investigated. The results show that the heterojunction is a direct Z-scheme photocatalyst and can achieve overall water splitting. By calculating the absorption spectrum, it is found that the heterojunction has a wider visible light absorption range when the bimetal is added, and there is still a strong absorption peak at 615 nm. With the increase of the Mo atom ratio, the absorption spectrum is red-shifted. The Gibbs free energy of the two-component Mo0.5W0.5S2/AlN heterojunction is only -0.028 eV. Our work provides a new perspective for the modification of 2D transition metal dichalcogenide photocatalytic heterojunctions.
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Affiliation(s)
- Liang Xu
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
- Kungfu Sci-tech Co., Ltd., Nanchang 330096, China
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Can Li
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
| | - S X Xiong
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
| | - Shuaihao Tang
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
| | - Zhiqiang Xu
- Kungfu Sci-tech Co., Ltd., Nanchang 330096, China
| | - Lei Cao
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
| | - Ji Tao
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
| | - Ying Zhang
- Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China.
| | - Kejun Dong
- Centre for Infrastructure Engineering, School of Engineering, Design and Built Environment, Western Sydney University, Penrith, NSW 2751, Australia.
| | - Ling-Ling Wang
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
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Li B, Xie Z, Liu H, Tang L, Chen K. A Review of Ultrathin Piezoelectric Films. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3107. [PMID: 37109944 PMCID: PMC10144961 DOI: 10.3390/ma16083107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/11/2023] [Accepted: 04/13/2023] [Indexed: 06/19/2023]
Abstract
Due to their high electromechanical coupling and energy density properties, ultrathin piezoelectric films have recently been intensively studied as key materials for the construction of miniaturized energy transducers, and in this paper we summarize the research progress. At the nanoscale, even a few atomic layers, ultrathin piezoelectric films have prominent shape anisotropic polarization, that is, in-plane polarization and out-of-plane polarization. In this review, we first introduce the in-plane and out-of-plane polarization mechanism, and then summarize the main ultrathin piezoelectric films studied at present. Secondly, we take perovskite, transition metal dichalcogenides, and Janus layers as examples to elaborate the existing scientific and engineering problems in the research of polarization, and their possible solutions. Finally, the application prospect of ultrathin piezoelectric films in miniaturized energy converters is summarized.
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