Simple chemical synthesis of novel two-dimensional magnets under ambient conditions in a macroscopic scale

V. Skakalova, P. Kotrusz, K. Mustonen, T.A. Bui, M. Precner, P. Hutar, Ch. Richter, K. Hricovini
Danubia NanoTech,
Slovakia

Keywords: 2D magnets, graphene heterostructures, large scale, STEM, eletrical transport

Summary:

Danubia NanoTech has recently developed a simple chemical method that, under ambient conditions, can provide novel two-dimensional (2D) materials in a macroscopic scale [1]. The method called SinGO (Synthesis in Graphene Oxide) opens an avenue to a new class of 2D magnetic and non-magnetic metal-iodides (2D-MI) encapsulated between graphene monolayers. In this way we can produce large scale area samples utilizing chemically clean interfaces between the magnetic 2D-MI and graphene. Such vdW stacks would serve as a novel platform for nanotechnological devices in which graphene as an ideal conducting channel of Dirac electrons can guide the encoded technologically relevant information. Noting that graphene spintronics has been aiming to exploit the extraordinary Dirac electronic properties but weak spin orbit-coupling limits its applicability for generating spin currents or spin torques. The proximity-induced spin-orbit coupling and exchange interactions in graphene-encapsulated 2D-MI magnets might enable spin transport with unexplored yet physical mechanisms. Here we will present the wide range characterization of 2D (magnetic and non-magnetic) metal-iodides encapsulated in graphene including their atomic structures (STEM), magnetization and electrical transport properties for possible applications. [1] K. Mustonen et al., Toward Exotic Layered Materials: 2D Cuprous Iodide, Advanced Materials 34, 2106922 (2022).