Manipulation of Dyzaloshinskii-Moria interaction in Pt/Co/AlO_xheterostructure

Dzyaloshinskii-Moria interaction originates from the combination of spin-orbit coupling and broken inversion symmetry.This interaction plays a crucial role in establishing and driving spin textures such as skyrmions and chiral domain walls which are essential ingredients for next-generation data storage devices in spintronics. Quantification of this interaction  is crucial for the fabrication of such devices. In this talk, we evaluate the interfacial DMI at the ferromagnet/metal oxide interface of Pt/Co/AlO_x  trilayers using asymmetric domain wall expansion and hysteresis loop shift methods. We find the Dyzaloshinskii-Moria interaction constants ranging from 0.09 mJ/m² to 1.13 mJ/m² by tuning  annealing time, substrate type, and AlO_x thickness. In addition, we also study the influence of oxygen content on DMI at the Co/AlO_x interface of trilayers. For this purpose, we perform X-ray photoelectron spectroscopy, transmission electron microscopy, and low-temperature Hall effect characterizations to investigate the interfacial oxygen content for samples annealed for different time intervals. We found a higher degree of oxygen at the interface for 3-hour annealed samples compared to 1-hr annealed one leading to the enhancement of Dyzaloshinskii-Moria constants.