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In this work, we study the antiferromagnetic (AFM) spin dynamics inheterostructures which consist of two kinds of AFM layers. Our micromagneticsimulations demonstrate that the AFM domain-wall (DW) can be driven by theother one (driven by field-like Neel spin-orbit torque, Phys. Rev. Lett. 117,017202 (2016)) through the interface couplings. Furthermore, the two DWs detachfrom each other when the torque increases above a critical value. The criticalfield and the highest possible velocity of the DW depending on several factorsare revealed and discussed. Bases on the calculated results, we propose amethod to modulate efficiently the multi DWs in antiferromagnet, whichdefinitely provides useful information for future AFM spintronics devicedesign.

Staggered field driven domain walls motion in antiferromagnetic heterojunctions