Che Yixuan, Lv Haifeng, Wu Xiaojun, Yang Jinlong
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei Anhui 230026 China.
Key Laboratory of Precision and Intelligent Chemistry, CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Science, and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), University of Science and Technology of China Hefei Anhui 230026 China
Chem Sci. 2024 Jul 27;15(34):13853-63. doi: 10.1039/d4sc04125a.
Altermagnets exhibit momentum-dependent spin-splitting in a collinear antiferromagnetic order due to their peculiar crystallographic and magnetic symmetry, resulting in the creation of spin currents with light elements. Here, we report two two-dimensional (2D) metal-organic framework (MOF) semiconductors, M(pyz) (M = Ca and Sr, pyz = pyrazine), which exhibit both altermagnetism and topological nodal point and line by using first-principles calculations and group theory. The altermagnetic 2D MOFs exhibit unconventional spin-splitting and macroscopic zero magnetization caused by 4-fold rotation in crystalline real space and 2-fold rotation in spin space, leading to the generation and control of anisotropic spin currents when an in-plane electric field ( ) is applied. In particular, pure spin current with the spin Hall effect occurs when is applied along the angular bisector of the two spin arrangements. Our work indicates the existence of altermagnetic MOF systems and a universal approach to generate electric-field-controlled spin currents for potential applications in antiferromagnetic spintronics.
由于其独特的晶体学和磁对称性，交变磁体在共线反铁磁序中表现出与动量相关的自旋分裂，从而导致与轻元素产生自旋电流。在此，我们报告了两种二维（2D）金属有机框架（MOF）半导体，M(pyz)（M = Ca和Sr，pyz = 吡嗪），它们通过第一性原理计算和群论同时表现出交变磁性和拓扑节点及线。交变磁性二维MOF表现出由晶体实空间中的四重旋转和自旋空间中的二重旋转引起的非常规自旋分裂和宏观零磁化，当施加平面内电场（ ）时，导致各向异性自旋电流的产生和控制。特别是，当 沿两个自旋排列的角平分线施加时，会出现具有自旋霍尔效应的纯自旋电流。我们的工作表明存在交变磁性MOF系统以及一种产生电场控制自旋电流的通用方法，可用于反铁磁自旋电子学的潜在应用。
