报告人：夏钶

报告题目：Anomalous Hall Effect in Non-collinear Anti-Ferromagnetic L12-type Mn3Ir

报告摘要：The anomalous Hall effect is generally treated as a direct response to the injecting charge current with spin-orbit interaction in magnetic materials. Recently, many works on the anomalous Hall effect in non-collinear anti-ferromagnetic materials are reported from both theoretical and experimental groups. And the physical origin of this anomalous Hall effect is mainly attributed to the Berry curvature.
In this work, using a first-principles-based scattering wave function approach, we study the anomalous Hall effect in non-collinear anti-ferromagnetic L12-type Mn3Ir and find that the corresponding anomalous Hall conductivity can be as large as 3.4×〖10〗^4 [Ω∙cm]^(-1) at low temperature, which is two orders of magnitude larger than that from Berry curvature calculations, indicating that the Berry curvature may not enough for this novel anomalous Hall effect. With a detailed analysis of the anomalous Hall effect therein, we found that the scattering process dominates. We propose that the anomalous Hall current is coming from the combination of the Ir induced conventional/inverse spin Hall effect and the spin reorientation when the corresponding spin current passes through the local magnetic moments of Mn in L12-type Mn3Ir. This indirect anomalous Hall effect should be universal in non-collinear anti-ferromagnetic materials and needed further study in the future.

报告简介：夏钶，北京计算科学研究中心Chair Professor,国家杰出青年科学基金获得者。主要从事量子输运理论、自旋电子学仿脑计算、电子结构计算方法发展等方向的研究。夏钶教授自行发展了基于第一原理计算纳米体系电子输运的理论方法，可以同时处理真实材料在实验条件下的电子及自旋输运问题，并将此方法成功地用于研究：a)磁性-非磁性界面，b)自旋极化电流对磁矩的转矩(spin torque)；c)铁磁/超导体界面的Andreev反射；d)反铁磁材料。在SCI收录的杂志上发表文章80余篇(含Nature Nano.PRL等10余篇)，在国际会议做邀请报告数十次。 http://www.csust.edu.cn/wdxy/info/1225/4622.htm?urltype=tree.TreeTempUrl&wbtreeid=1226