Spin-polarized currents play a key role in spintronics. Recently, it has been found that antiferromagnets with a non-spin-degenerate band structure can efficiently spin-polarize electric currents, even though their net magnetization is zero. Among the antiferromagnetic metals with magnetic space group symmetry supporting this functionality, the noncollinear antiferromagnetic antiperovskites ANMn$_3$ (A = Ga, Ni, Sn, and Pt) are especially promising. This is due to their high Néel temperatures and a good lattice match to perovskite oxide substrates, offering possibilities of high structural quality heterostructures based on these materials. Here, we investigate the spin polarization of antiferromagnetic ANMn$_3$ metals using first-principles density functional theory calculations. We find that the spin polarization of the longitudinal currents in these materials is comparable to that in widely used ferromagnetic metals, and thus can be exploited in magnetic tunnel junctions and spin transfer torque devices. Moreover, for certain film growth directions, the out-of-plane transverse spin currents with a giant charge-to-spin conversion efficiency can be achieved, implying that the ANMn$_3$ antiperovskites can be used as efficient spin sources. These properties make ANMn$_3$ compounds promising for application in spintronics.
Tunable negative thermal expansion related with the gradual evolution of antiferromagnetic ordering in antiperovskite manganese nitrides Ag1-xNMn3+x (0<x<0.6)
Turn-on of Current-Induced Spin Torque upon Noncollinear Antiferromagnetic Ordering in Delafossite PdCrO2
Cornell University（康奈尔大学）；Trinity College, University of Oxford（牛津大学三一学院）；University of Nebraska, Lincoln（内布拉斯加大学林肯分校）；Kavli Institute at Cornell for Nanoscale Science（康奈尔纳米科学卡弗里研究所）
Ferrimagnetic Order in Tetragonal Antiperovskite Mn$_3$GeN
National Renewable Energy Laboratory（国家可再生能源实验室）；Colorado State University（科罗拉多州立大学）；University of Maryland（马里兰大学）；Oak Ridge National Laboratory（橡树岭国家实验室）
Magnetic order and Li-diffusion in the 1/3-filled Kagome layers of antiperovskite Lithium-ion battery materials (Li$_2$Fe)SO and (Li$_2$Fe)SeO
Technische Universität Dresden（德累斯顿工业大学）；Leibniz Institute for Solid State and Materials Research Dresden（德累斯顿莱布尼茨固体与材料研究所）；Kirchhoff Institute for Physics, Heidelberg University（海德堡大学基尔霍夫物理研究所）；Department of Physics, Faculty of Science, Sohag University（索哈格大学理学院物理系）
High-throughput screening of Half-antiperovskites with a stacked kagome lattice
半反钙钛矿（HAP）是一类由堆叠的可果美晶格组成的材料，因此具有奇异的磁性和电子态。我们进行高通量计算的基础上的密度泛函理论（DFT）和原子自旋动力学（ASD）模拟预测稳定的磁性HAPs M $_3$ X $_2$ Z $_2$（M = Cr，Mn，Fe，Co和Ni; X是从Li到Bi的元素之一，除了稀有气体和4 $f$稀土金属; Z = S，Se和Te），与结晶和机械稳定性评估。此外，磁基态是通过利用DFT计算结合ASD模拟得到的。原子力显微镜kagome晶格中存在的自旋阻挫表现为面内FM和AFM耦合的竞争行为。对于总数为930 HAP组合物考虑，我们已经发现了23个化合物，稳定在非共线反铁磁（AFM）状态和11个化合物，具有铁磁（FM）秩序。
Field-tunable toroidal moment and anomalous Hall effect in noncollinear antiferromagnetic Weyl semimetal Co1/3TaS2
将磁性与能带拓扑结构相结合，提供了各种新颖的相位，这在其他方面是不可能的。其中，非共线金属反铁磁体因其不同的磁基态而具有丰富的拓扑物理性质。然而，由于缺乏合适的材料，特别是三角晶格反铁磁体，只有很少的实验研究。在这里，我们报告，金属三角形反铁磁体Co 1/3 TaS 2表现出大量的异常霍尔效应（AHE）有关的非共线磁序。我们的第一性原理计算发现，沙漏外尔费米子从非对称对称触发AHE。我们进一步表明，AHE在Co 1/3 TaS 2的特点是由环向力矩，一个涡旋状的多极分量，产生的手征晶格和几何挫折的组合。最后，不寻常的磁场可调性的环矩把Co 1/3 TaS 2作为一个罕见的例子，非共线金属反铁磁体充满有趣的磁性和拓扑性质。
Direct imaging and control of Berry curvature in noncollinear antiferromagnetic single-crystal thin films
University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；University of California, Irvine（加州大学尔湾分校）；University of Nebraska, Lincoln（内布拉斯加大学林肯分校）；University of Oxford（牛津大学）；University College London（伦敦大学学院）；STFC Rutherford Appleton Laboratory（英国科学与技术设施委员会鲁瑟福阿普尔顿实验室）
High-resolution neutron diffraction determination of noncollinear antiferromagnetic order in the honeycomb magnetoelectric Fe$_{4}$Nb$_{2}$O$_{9}$
Institute for Basic Science (IBS)（韩国基础科学研究院）；Yonsei University（延世大学）；Chonnam National University（全南国立大学）；Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)（韩国基础科学研究院集成纳米物理中心）；Sungkyunkwan University（成均馆大学）；Rutgers University（罗格斯大学）
Ultrafast control of spin order by linearly polarized light in noncollinear antiferromagnetic metals
Charles University（查理大学）；Institute of Physics ASCR（捷克科学院物理研究所）；Czech Technical University（捷克理工大学）；University of Cambridge（剑桥大学）；University of Glasgow（格拉斯哥大学）；LoMaRe Technologies Ltd.（洛马雷科技有限公司）；LoMaRe Chip Technology Changzhou Co., Ltd.（洛马雷芯片技术常州有限公司）；Imperial College London（帝国理工学院）
Magnetic phase diagram, magnetotransport and inverse magnetocaloric effect in the noncollinear antiferromagnet Mn$_5$Si$_3$
反铁磁体Mn $_5$ Si $_3$最近引起了人们的注意，因为非共线自旋排列已被证明产生拓扑异常霍尔效应和逆磁热效应。在这里，我们使用助熔剂生长法合成Mn $_5$ Si $_3$单晶。我们通过磁化确定了相图，并测量了磁阻和霍尔效应。我们发现在低温下的共线和非共线的反铁磁相，此外，第三个磁性相，在两个反铁磁相之间，具有铁磁特性。后者的磁性相可能是由铜夹杂物产生的应变，导致淬灭的混合字符在此化合物中的磁有序的波动。
Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator $\mathrm{MnBi_2Te_4}$
Disentangling magnetic and optical contributions in ultrafast dynamics of antiperovskite non-collinear antiferromagnets
Charles University（查理大学）；University of Cambridge（剑桥大学）；University of Glasgow（格拉斯哥大学）；Czech Technical University（捷克理工大学）；LoMaRe Technologies Ltd.（洛玛雷科技有限公司）；Jiangsu LoMaRe Chip Technology Co., Ltd.（江苏洛玛雷芯片技术有限公司）
Noncollinear spin textures and 90° domain walls in twisted XY magnets
WPI Advanced Institute for Materials Research (AIMR), Tohoku University（东北大学材料高等研究院）；Frontier Research Institute for Interdisciplinary Sciences, Tohoku University（东北大学前沿交叉科学研究院）；Elmore Family School of Electrical and Computer Engineering, Purdue University（普渡大学埃尔莫电气与计算机工程学院）；Department of Physics and Astronomy, Purdue University（普渡大学物理与天文学系）；Purdue Quantum Science and Engineering Institute and Birck Nanotechnology Center, Purdue University（普渡大学量子科学与工程研究所及伯克纳米技术中心）；Institute of Physics and Astronomy and Villum Centers for Hybrid Quantum Materials and devices, Aarhus University（奥胡斯大学物理与天文研究所及维伦混合量子材料与器件中心）；Institute for Materials Research (IMR), Tohoku University（东北大学材料研究所）；School of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China（中国人民大学物理学院及光电功能材料与微纳器件北京市重点实验室）；Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China（中国人民大学量子态构建与操控教育部重点实验室）；Research Center for Electronic and Optical Materials, National Institute for Materials Science（物质材料研究机构电子与光学材料研究中心）；Research Center for Materials Nanoarchitectonics, National Institute for Materials Science（物质材料研究机构材料纳米架构研究中心）
