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Current-induced motion of domain walls (CIMDW) with interfacialDzyaloshinskii-Moriya interaction (DMI) in heavy metal (HM)/ferromagnetic (FM)metal multilayers have attracted attention owing to their potential applicationin novel magnetic memories. In recent years, the CIMDW at ultrahigh speed hasbeen observed in a synthetic antiferromagnetic (SAF) multilayer. However, dueto the zero net magnetization, the reading of information from the SAFmultilayer is still challenging. In this work, we propose a readable racetrackmemory consisting of a synthetic ferromagnetic multilayer composed of two FMlayers with an interlayer FM coupling. One FM layer had an isotropic DMI, whilethe other had an anisotropic DMI. This difference of DMIs resulted in theopposite tilting directions of the DW planes in the two layers. This tiltingwas inhibited by a strong interlayer FM coupling, resulting in an increase inthe DW velocity and the reduction of the minimum allowed spacing between twoadjacent DWs. In addition, the FM coupling enhanced the stray field, and thestored information could be read conveniently using a conventional readinghead. Therefore, our proposal paves a way for the fabrication of a racetrackmemory with high reading speed, large storage density, and good readability.

Readable Racetrack Memory via Ferromagnetically Coupled Chiral Domain Walls