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Research@IITD

Direct measurement of interfacial Dzyaloshinskii–Moriya interaction at the MoS2/Ni80Fe20 interface (Editor’s-pick)

Dzyaloshinskii-Moriya interaction (DMI) is an essential ingredient for skyrmions and other chiral spin textures, which are potential candidates for memory and logic applications due to their efficient current-driven motion and smaller size. In this paper, we report on the direct observation of a sizable DMI in a large area and few layer-MoS2/Py using BLS spectroscopy. The measured DMI in this system is found to be larger compared to Graphene/Py system and is of the comparable magnitude as that of the FM/HM bilayer systems for similar thickness of FM layer. The linear dependence of the DMI with the inverse of Py thickness and the absence of DMI in the reference sample indicate that the DMI in this system originates from the interface of MoS2/Py. We found that 3-4 layer (L) MoS2/Py system shows larger iDMI as compared to 2L MoS2/Py, which is attributed to a higher density of MoO3 defect species in the case of larger defects in the 3-4L MoS2. These results will be important for development of stable canted spin structures using exciting 2D-TMDs based 2D spintronic materials.

Akash Kumar, Avinash Kumar Chaurasiya, Niru Chowdhury, Amrit Kumar Mondal, Rajni Bansal, Arun Barvat, Suraj P. Khanna, Prabir Pal, Sujeet Chaudhary, Anjan Barman, and P. K. Muduli

Appl. Phys. Lett. 116, 232405 (2020); https://doi.org/10.1063/5.0009828