Indian Researchers demonstrates DMI interaction using Graphene

Description: 

A team of Indian researchers from Indian Institute of Technology, Delhi and S. N. Bose National Centre for Basic Sciences, Kolkata—has found a new type of interaction, called Dzyaloshinskii–Moriya interactions (DMIs) when graphene is combined with the commonly used magnetic material permalloy ( 80 % Ni and 20 % Fe). The DMI is the essential ingredient for formation of swirling patterns at the interface known as “Skyrmions”, which are considered potential way for for storing and erasing data on magnetic media as well as for logic and neuromorphic computing. The team report a new and rather unusual type of DMI in graphene/Py system. They showed that the DMI in their system arises due to the defect induced extrinsic spin-orbit coupling at the graphene/Py interface. Recently, Yang et al., [1] had also reported DMI at graphene/Ferromagnet interface. However, Yang et al. explained the iDMI observed in their system using Rashba effect. The iDMI observed by In Yang et al.’s work decays exponentially and vanishes within few monolayer of FM layer. In contrast, the Indian team demonstrated significantly large value of iDMI in rather thicker Py films (up to 8 nm). The team also used simple and industry friendly sputter deposition for growth of Permalloy as opposed to molecular beam epitaxy used by Yang et al. The Indian team believes that the discovery is very important for this field of spintronics and in particular for memory, logic and neuromorphic devices using skyrmions. References [1] Hongxin Yang, et al., Nat. Mat. 17, 605 (2018)”

Contact details: 

Dr. Pranaba Kishor Muduli

Department of Physics

muduli[at]physics.iitd.ac.in