1
|
Zhao Y, Lei Z, Wang Y, Yan W, Tan R, Jing T, Sun Q. Theoretical prediction of two-dimensional ferromagnetic Mn 2X 2 (X = As, Sb) with strain-controlled magnetocrystalline anisotropy. Phys Chem Chem Phys 2024; 26:2324-2331. [PMID: 38165825 DOI: 10.1039/d3cp03691j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Two-dimensional (2D) magnetic materials with large and tunable magnetocrystalline anisotropy (MCA) provide unique opportunities to develop various spintronic devices. We, herein, propose an experimentally feasible 2D material platform, Mn2X2 (X = As, Sb), which is a family of intrinsic ferromagnet. Using first-principles calculations, we show that 2D Mn2X2 (X = As, Sb) with a robust ferromagnetic ground state exhibits not only a large perpendicular magnetic anisotropy (PMA), but also significant strain-driven modulation behaviors under external biaxial strain. The analysis of the results demonstrates that the dominant contribution to the change of MCA of Mn2As2 and Mn2Sb2 primarily arises from the Mn and Sb atoms, respectively. Moreover, we reveal that the underlying origin is the competitive mechanism for the spin-orbit coupling (SOC) between different orbitals and spin channels. These findings indicate that 2D Mn2X2 (X = As, Sb) provides a promising material platform for the next generation of ultra-low energy memory devices.
Collapse
Affiliation(s)
- Yi Zhao
- School of Science, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| | - Zesen Lei
- School of Science, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| | - Yonghao Wang
- School of Science, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| | - Wei Yan
- School of Science, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| | - Ruishan Tan
- School of Science, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| | - Tao Jing
- College of Science, Kaili University, Kaili, Guizhou 556011, China
| | - Qilong Sun
- School of Science, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| |
Collapse
|
2
|
Gupta R, Pradhan J, Haldar A, Murapaka C, Chandra Mondal P. Chemical Approach Towards Broadband Spintronics on Nanoscale Pyrene Films. Angew Chem Int Ed Engl 2023; 62:e202307458. [PMID: 37363873 DOI: 10.1002/anie.202307458] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/26/2023] [Accepted: 06/26/2023] [Indexed: 06/28/2023]
Abstract
The injection of pure spin current into the non-magnetic layer plays a crucial role in transmitting, processing, and storing data information in the realm of spintronics. To understand broadband molecular spintronics, pyrene oligomer film (≈20 nm thickness) was prepared using an electrochemical method forming indium tin oxide (ITO) electrode/pyrene covalent interfaces. Permalloy (Ni80 Fe20 ) films with different nanoscale thicknesses were used as top contact over ITO/pyrene layers to estimate the spin pumping efficiency across the interfaces using broadband ferromagnetic resonance spectra. The spintronic devices are composed of permalloy/pyrene/ITO orthogonal configuration, showing remarkable spin pumping from permalloy to pyrene film. The large spin pumping is evident from the linewidth broadening of 5.4 mT at 9 GHz, which is direct proof of spin angular momentum transfer across the interface. A striking observation is made with the high spin-mixing conductance of ≈1.02×1018 m-2 , a value comparable to the conventional heavy metals. Large spin angular moment transfer was observed at the permalloy-pyrene interfaces, especially at the lower thickness of permalloy, indicating a strong spinterface effect. Pure spin current injection from ferromagnetic into electrochemically grown pyrene films ensures efficient broadband spin transport, which opens a new area in molecular broadband spintronics.
Collapse
Affiliation(s)
- Ritu Gupta
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh, 208016, India
| | - Jhantu Pradhan
- Department of Physics, Indian Institute of Technology Hyderabad, Kandi-502285, Telangana, India
- Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi-502285, Telangana, India
| | - Arabinda Haldar
- Department of Physics, Indian Institute of Technology Hyderabad, Kandi-502285, Telangana, India
| | - Chandrasekhar Murapaka
- Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi-502285, Telangana, India
| | - Prakash Chandra Mondal
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh, 208016, India
| |
Collapse
|
3
|
Chakraborti S, Sharma A. Non-uniform superlattice magnetic tunnel junctions. NANOTECHNOLOGY 2023; 34:185206. [PMID: 36706446 DOI: 10.1088/1361-6528/acb69b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
We propose a new class of non-uniform superlattice magnetic tunnel junctions (Nu-SLTJs) with the linear, Gaussian, Lorentzian, and Pöschl-Teller width and height based profiles manifesting a sizable enhancement in the TMR (≈104- 106%) with a significant suppression in the switching bias (≈9 folds) owing to the physics of broad-band spin filtering. By exploring the negative differential resistance region in the current-voltage characteristics of the various Nu-SLTJs, we predict the Nu-SLTJs offer fastest spin transfer torque switching in the order of a few hundred picoseconds. We self-consistently employ the atomistic non-equilibrium Green's function formalism coupled with the Landau-Lifshitz-Gilbert-Slonczewski equation to evaluate the device performance of the various Nu-SLTJs. We also present the design of minimal three-barrier Nu-SLTJs having significant TMR (≈104%) and large spin current for the ease of device fabrication. We hope that the class of Nu-SLTJs proposed in this work may lay the bedrock to embark on the exhilarating voyage of exploring various non-uniform superlattices for the next generation of spintronic devices.
Collapse
Affiliation(s)
- Sabarna Chakraborti
- Department of Electrical Engineering, Indian Institute of Technology Ropar, Nangal Rd, Hussainpur, Rupnagar, Punjab 140001, India
| | - Abhishek Sharma
- Department of Electrical Engineering, Indian Institute of Technology Ropar, Nangal Rd, Hussainpur, Rupnagar, Punjab 140001, India
| |
Collapse
|
4
|
Yan K, Hu Y, Suo Y, Qin Y, Chen X. Magnetoresistance of Ni/WSe 2/Ni junctions: robustness against the thickness of WSe 2. NANOTECHNOLOGY 2022; 33:385001. [PMID: 35696975 DOI: 10.1088/1361-6528/ac780e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
Magnetoresistive materials are vital for the development of storage devices. Using the first-principles transport simulations with nonequilibrium Green's function calculation, we investigate the magnetoresistive properties of Ni/WSe2/Ni junctions withm-layers of WSe2(m= 1, 2, ⋯ ,6). Form≤ 2, the junctions are metallic inspite of the semiconducting nature of few-layer WSe2. However, the junctions exhibit transport gaps form> 2. Interestingly, magnetoresistance of the junctions stays around 6% when there are more than one layer of WSe2in the center, which is closely related to the robust spacial variation of interfacial properties and can be attributed to no spin flipping in tunneling regions. Our results suggest that Ni/WSe2/Ni junctions have a robust magnetoresistance which is insensitive to the thickness of WSe2.
Collapse
Affiliation(s)
- Kun Yan
- School of Science, State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
| | - Yizhi Hu
- School of Science, State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
| | - Yan Suo
- School of Science, State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
| | - Yuxia Qin
- School of Science, State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
| | - Xiaobin Chen
- School of Science, State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen 518055, People's Republic of China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, People's Republic of China
| |
Collapse
|
5
|
Pham PV, Bodepudi SC, Shehzad K, Liu Y, Xu Y, Yu B, Duan X. 2D Heterostructures for Ubiquitous Electronics and Optoelectronics: Principles, Opportunities, and Challenges. Chem Rev 2022; 122:6514-6613. [PMID: 35133801 DOI: 10.1021/acs.chemrev.1c00735] [Citation(s) in RCA: 89] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A grand family of two-dimensional (2D) materials and their heterostructures have been discovered through the extensive experimental and theoretical efforts of chemists, material scientists, physicists, and technologists. These pioneering works contribute to realizing the fundamental platforms to explore and analyze new physical/chemical properties and technological phenomena at the micro-nano-pico scales. Engineering 2D van der Waals (vdW) materials and their heterostructures via chemical and physical methods with a suitable choice of stacking order, thickness, and interlayer interactions enable exotic carrier dynamics, showing potential in high-frequency electronics, broadband optoelectronics, low-power neuromorphic computing, and ubiquitous electronics. This comprehensive review addresses recent advances in terms of representative 2D materials, the general fabrication methods, and characterization techniques and the vital role of the physical parameters affecting the quality of 2D heterostructures. The main emphasis is on 2D heterostructures and 3D-bulk (3D) hybrid systems exhibiting intrinsic quantum mechanical responses in the optical, valley, and topological states. Finally, we discuss the universality of 2D heterostructures with representative applications and trends for future electronics and optoelectronics (FEO) under the challenges and opportunities from physical, nanotechnological, and material synthesis perspectives.
Collapse
Affiliation(s)
- Phuong V Pham
- School of Micro-Nano Electronics, Hangzhou Global Scientific and Technological Innovation Center (HIC), Zhejiang University, Xiaoshan 311200, China.,State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.,ZJU-UIUC Joint Institute, Zhejiang University, Jiaxing 314400, China
| | - Srikrishna Chanakya Bodepudi
- School of Micro-Nano Electronics, Hangzhou Global Scientific and Technological Innovation Center (HIC), Zhejiang University, Xiaoshan 311200, China.,State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.,ZJU-UIUC Joint Institute, Zhejiang University, Jiaxing 314400, China
| | - Khurram Shehzad
- School of Micro-Nano Electronics, Hangzhou Global Scientific and Technological Innovation Center (HIC), Zhejiang University, Xiaoshan 311200, China.,State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.,ZJU-UIUC Joint Institute, Zhejiang University, Jiaxing 314400, China
| | - Yuan Liu
- School of Physics and Electronics, Hunan University, Hunan 410082, China
| | - Yang Xu
- School of Micro-Nano Electronics, Hangzhou Global Scientific and Technological Innovation Center (HIC), Zhejiang University, Xiaoshan 311200, China.,State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.,ZJU-UIUC Joint Institute, Zhejiang University, Jiaxing 314400, China
| | - Bin Yu
- School of Micro-Nano Electronics, Hangzhou Global Scientific and Technological Innovation Center (HIC), Zhejiang University, Xiaoshan 311200, China.,State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China.,ZJU-UIUC Joint Institute, Zhejiang University, Jiaxing 314400, China
| | - Xiangfeng Duan
- Department of Chemistry and Biochemistry, University of California, Los Angeles (UCLA), Los Angeles, California 90095-1569, United States
| |
Collapse
|
6
|
Wang RN, Jin CD, Zhang H, Lian RQ, Shi XQ, Wang JL. Strain-driven phase transition and spin polarization of Re-doped transition-metal dichalcogenides. Phys Chem Chem Phys 2021; 23:9962-9970. [PMID: 33870393 DOI: 10.1039/d1cp00640a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional transition metal dichalcogenides (TMDCs) are promising in spintronics due to their spin-orbit coupling, but their intrinsic non-magnetic properties limit their further development. Here, we focus on the energy landscapes of TMDC (MX2, M = Mo, W and X = S, Se, Te) monolayers by rhenium (Re) substitution doping under axial strains, which controllably drive 1H ↔ 1Td structural transformations. For both 1H and 1Td phases without strain, Re-doped TMDCs have an n-type character and are non-magnetic, but the tensile strain could effectively induce and modulate the magnetism. Specifically, 1H-Re0.5Mo0.5S2 gets a maximum magnetic moment of 0.69 μB at a 6% uniaxial tensile strain along the armchair direction; along the zigzag direction it exhibits a significant magnetic moment (0.49 μB) at a 2.04% uniaxial tensile strain but then exhibits no magnetism in the range of [5.10%, 7.14%]. By contrast, for 1Td-Re0.5Mo0.5S2 a critical uniaxial tensile strain along the zigzag direction reaches up to ∼9.18%, and a smaller uniaxial tensile strain (∼5.10%) along the zigzag direction is needed to induce the magnetism in 1Td-Re0.5M0.5Te2. The results reveal that the magnetism of Re-doped TMDCs could be effectively induced and modulated by the tensile strain, suggesting that strain engineering could have significant applications in doped TMDCs.
Collapse
Affiliation(s)
- Rui-Ning Wang
- Key Laboratory of Optic-Electronic Information and Materials of Hebei Province, National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China.
| | | | | | | | | | | |
Collapse
|
7
|
Ávalos-Ovando O, Mastrogiuseppe D, Ulloa SE. Lateral heterostructures and one-dimensional interfaces in 2D transition metal dichalcogenides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:213001. [PMID: 30794993 DOI: 10.1088/1361-648x/ab0970] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The growth and exfoliation of two-dimensional (2D) materials have led to the creation of edges and novel interfacial states at the juncture between crystals with different composition or phases. These hybrid heterostructures (HSs) can be built as vertical van der Waals stacks, resulting in a 2D interface, or as stitched adjacent monolayer crystals, resulting in one-dimensional (1D) interfaces. Although most attention has been focused on vertical HSs, increasing theoretical and experimental interest in 1D interfaces is evident. In-plane interfacial states between different 2D materials inherit properties from both crystals, giving rise to robust states with unique 1D non-parabolic dispersion and strong spin-orbit effects. With such unique characteristics, these states provide an exciting platform for realizing 1D physics. Here, we review and discuss advances in 1D heterojunctions, with emphasis on theoretical approaches for describing those between semiconducting transition metal dichalcogenides MX 2 (with M = Mo, W and X = S, Se, Te), and how the interfacial states can be characterized and utilized. We also address how the interfaces depend on edge geometries (such as zigzag and armchair) or strain, as lattice parameters differ across the interface, and how these features affect excitonic/optical response. This review is intended to serve as a resource for promoting theoretical and experimental studies in this rapidly evolving field.
Collapse
Affiliation(s)
- O Ávalos-Ovando
- Department of Physics and Astronomy, and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, OH 45701-2979, United States of America
| | | | | |
Collapse
|
8
|
Li J, Di M, Yang Z, Xu LC, Yang Y, Liu X. Spin-filtering and tunneling magnetoresistance effects in 6,6,12-graphyne-based molecular magnetic tunnel junctions. Phys Chem Chem Phys 2019; 21:2734-2742. [PMID: 30664141 DOI: 10.1039/c8cp06927a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In the present study, by cutting 6,6,12-graphyne along vertical and horizontal directions, two kinds of 6,6,12-graphyne nanodots (6,6,12-GYNDs) with different sizes are obtained. Using these 6,6,12-GYNDs, we theoretically designed two kinds of 6,6,12-graphyne-based molecular magnetic tunnel junctions (MMTJs) and investigated their spin-dependent transport properties. Depending on the orientation of the 6,6,12-GYNDs and the connection of the 6,6,12-GYNDs to electrodes, our results show that the two MMTJs have novel transport behaviors. Two different net spin currents can be obtained by tuning the spin configurations and the maximal order of magnitudes of tunneling magnetoresistance values of the two MMTJs reaches 106%. The high spin-filtering ratio and large tunneling magnetoresistance value provide high sensitivity for practical applications. Therefore, the spin-filtering and tunneling magnetoresistance effects enable 6,6,12-graphyne-based MMTJs to be used as spintronic devices.
Collapse
Affiliation(s)
- Jin Li
- Key Lab of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China.
| | | | | | | | | | | |
Collapse
|
9
|
Wang Q, Li J, Nie Y, Xu F, Yu Y, Wang B. Pure spin current and phonon thermoelectric transport in a triangulene-based molecular junction. Phys Chem Chem Phys 2018; 20:15736-15745. [DOI: 10.1039/c8cp02322k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A triangulene-based molecular junction: a favorable spintronic device with pure spin current and efficient phonon thermoelectric transport.
Collapse
Affiliation(s)
- Qiang Wang
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- College of Physics and Energy
- College of Electronic Science and Technology
- Shenzhen University
- Shenzhen
| | - Jianwei Li
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- College of Physics and Energy
- College of Electronic Science and Technology
- Shenzhen University
- Shenzhen
| | - Yihang Nie
- Institute of Theoretical Physics
- Shanxi University
- Taiyuan 030006
- China
| | - Fuming Xu
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- College of Physics and Energy
- College of Electronic Science and Technology
- Shenzhen University
- Shenzhen
| | - Yunjin Yu
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- College of Physics and Energy
- College of Electronic Science and Technology
- Shenzhen University
- Shenzhen
| | - Bin Wang
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- College of Physics and Energy
- College of Electronic Science and Technology
- Shenzhen University
- Shenzhen
| |
Collapse
|