En enhetlig teori för antiferromagnetisk spinntronik och spinnorbitronik

Tidsperiod: 2019-01-01 till 2022-12-31

Projektledare: Dmitry Yudin

Finansiär: Vetenskapsrådet

Bidragstyp: Bidrag för anställning eller stipendier

Budget: 3 500 000 SEK

Despite being a mature field of research studying of magnetism and spin-dependent phenomena remains one of the most fascinating area in condensed matter physics. Indeed, progress in technological development over the past decades is mainly held by achievements in spintronics and related fields. Recently discovered manipulation of antiferromagnetic order parameter by purely electrical means marks a new and fast developing area of antiferromagnetic spintronics as a technological frontier. In this project we explore theoretical grounds for ultrafast antiferromagnetic domain control by optical and THz fields in the presence of external electric currents. This idea stems from a possibility for ultrafast control of effective spin interactions in antiferromagnets by short laser pulses and paves the way towards novel functionalities of spintronic devices. We pursue this avenue to explore the dynamics of antiferromagnetic domains under the combination of optical fields and electric currents that may potentially be used in developing optical interconnects and THz detectors. On the fundamental level we contribute to the emerging microscopic theory of spin torques in non-equilibrium conditions with the focus on antiferromagnet/heavy metal heterostructures that enjoy partial spin-momentum locking due to strong spin-orbit coupling, and also explore the ultrafast phenomena in bilayers composed of antiferromagnet from one side and Weyl semimetal or topological insulator from another.