Spin-motive Force Induced by Domain Wall Dynamics in the Antiferromagnetic Spin Valve

In spite of no net magnetization in antiferromagnetic (AF) textures, the local magnetic properties (Neel magnetization) can be manipulated in a similar fashion to ferromagnetic (F) ones [1,2]. It is expected that, even in AF metals, spin transfer torques (STTs) lead to the domain wall (DW) motion and that the DW motion induces spin-motive force (SMF). In order to study the Neel magnetization dynamics and the resultant SMF, we treat the nano-structured F1/AF/F2 junction. The F1 and F2 leads behave as a spin current injector and a detector, respectively. Each F lead is fixed in the different magnetization direction. Torsions (DW in AF) are introduced reflecting the fixed magnetization of two F leads. We simulated the STT-induced Neel magnetization dynamics with the injecting current from F1 to F2 and evaluate induced SMF. Based on the adiabatic electron dynamics in the AF texture [2], Langevin simulations are performed at finite temperature.\\[4pt] [1] F. Y. Yang and C. L. Chien, Phys. Rev. Lett. 85, 2597 (2000); J. M. Logan et al., Appl. Phys. Lett. 100, 192405 (2012).\\[0pt] [2] R. Cheng and Q. Niu Phys. Rev. B 86, 245118 (2012); A. C. Swaving and R. A. Duine, Phys. Rev. B 83, 054428 (2011); E. G. Tvetenet al.,Phys. Rev. Lett. 110,127208 (2013).