Antiferromagnets for spinorbitronics from ab-initio theory

自旋电子学在应用和新兴技术方面的潜力是几十年来最高的。自旋-轨道相互作用作为横向自旋流背后的来源的发现，预示着一个令人兴奋的研究方向的开始，称为自旋轨道电子学。尽管目前对自旋轨道电子学的大多数研究都与顺磁体和铁磁体密切相关，但反铁磁(AFM)材料在自旋轨道驱动的输运表现形式和自旋轨道电子学的应用方面一直被忽视，尽管它们具有显著的磁不可见性、超快动力学和抗磁场能力。在过去的几年里，由于观察到反铁磁体可以作为显着的横向自旋电流的来源，并且AFM的交错磁化强度的全电子相对论转换是可能的，一个新的有前途的反铁磁旋轨道电子学领域开始出现。在这个项目中，我们将使用高度可预测的从头计算理论，它可以在同一保护伞下统一由于AFM异质结构中电流和磁化的相对论耦合而产生的效应，用于设计、理解和发现新的相对论效应，这些效应表现在：(I)自旋和反常霍尔效应、自旋轨道扭矩和电流诱导的自旋积累；(Ii)AFM磁化动力学驱动的电荷和自旋泵浦效应；以及(Iii)AFM的非平凡轨道和手征响应，包括电流诱导的轨道磁化和Dzyaloshinskii-Moriya相互作用。我们的最终目标是通过提出新的效应和提高反铁磁性电子控制的效率和材料设计来塑造反铁磁性自旋轨道电子学的未来。

The potential of spintronics for applications and new emergent technologies is highest in decades. The discovery of the spin-orbit interaction as the source behind transverse spin-currents heralds the beginning of an exciting research direction called spinorbitronics. While most of the current studies in spinorbitronics are closely associated with paramagnets and ferromagnets, antiferromagnetic (AFM) materials have been so far largely overlooked with respect to spin-orbit driven transport manifestations and spinorbitronics applications, despite their remarkable properties such as magnetic invisibility, ultrafast dynamics and robustness against magnetic fields. In the past couple of years a new promising field of antiferromagnetic spinorbitronics started to emerge owing in large to the observations that antiferromagnets can serve as sources of pronounced transverse spin currents, and that an all-electrical relativistic switching of staggered AFM magnetization is possible. In this project, we will use the highly-predictive ab-initio theory, which can unite under the same umbrella the effects due to relativistic coupling of currents and magnetization in AFM heterostructures for the design, understanding and discovery of novel relativistic effects which manifest in: (i) spin- and anomalous Hall effects, spin-orbit torques, and current-induced spin accumulation; (ii) AFM magnetization-dynamics driven charge- and spin-pumping effects, and (iii) non-trivial orbital and chiral response of AFMs in terms of current-induced orbital magnetization and Dzyaloshinskii-Moriya interaction. Our ultimate objective is shaping the future of antiferromagnetic spinorbitronics by suggesting new effects and sharpening the efficiency and materials design for electrical control of antiferromagnetism.