New Material Platforms for Antiferromagnetic Spintronics

报告题目:New Material Platforms for Antiferromagnetic Spintronics

报告人:邵定夫  美国内布拉斯加大学林肯分校

报告时间:2020 1 16 日 上午 10:00-11:00

报告邀请人: 江华

报告地点:致远楼 301

报告摘要: Antiferromagnetic (AFM) spintronics is an emerging field of research, which uses the antiferromagnets as the active spin-dependent elements for the next generation of spintronic applications. This talk will address three approaches predicted by density-functional theory calculations, involving new material platforms, which are promising for AFM spintronics. The first approach exploits the magnetoelectric effect at the interface between the non-collinear AFM antiperovskite ANMn3 (A = Ga, Ni, Zn, etc.) and a ferroelectric perovskite oxide. The ferroelectric modulation of the antiferromagnetic exchange coupling generates the canting of the interfacial moments, leading to the sizable net magnetization that can be reversed by the ferroelectric switching. The second approach involves Néel vector switching in non-collinear AFM antiperovskites by strain or spin-transfer torque, which changes the magnetic space groups and results in the sign and magnitude changes of the anomalous Hall conductivity. The third approach comprises the subfield of AFM spintronics known as topological AFM spintronics, where the Néel vector is used to electrically manipulate the symmetry related topological states. We demonstrate that room temperature AFM metal MnPd2 allows the electrical control of the Dirac nodal line by the Néel spin-orbit torque, leading to the sizable change of the spin-Hall conductivity. These approaches support the efficient manipulation and detection of the AFM order, which broaden the scope of material platforms that can be exploited in AFM spintronics.  

报告人简介: 邵定夫,2008年本科毕业于中国矿业大学材料科学与工程专业,2013年博士毕业于中国科学院大学凝聚态物理专业。2013年至2016年在中国科学院固体物理研究所担任助理研究员。2016年至今在美国内布拉斯加大学林肯分校物理系从事博士后研究。邵定夫博士长期从事量子材料自旋-轨道电子学特性的密度泛函理论研究,目前已经在这一领域发表SCI论文40余篇,其中以第一作者、共同第一作者及通讯作者身份,在Physical Review Letters, Science Advances 等期刊发布论文20余篇。