The spin spiral (SS) state in monolayer (ML) NiI2 presents a promising avenue for the exploration of two-dimensional multiferroics, however the mechanisms underlying this SS state and its efficient modulation stay insufficiently understood. On this examine, we make use of first-principles calculations to disclose the most important options and bodily mechanisms governing the magnetism of ML-NiI2 below in-plane pressure, explicitly contemplating the consequences of higher-order interactions (HOIs), which have been neglected in prior analysis. Our findings determine the magnetic floor state of ML-NiI2 as an SS state characterised by a propagation vector q = 0.23, and reveal that in-plane biaxial pressure serves as an efficient methodology for tuning the interval and stability of the SS state, the annoyed ratio, magnetic anisotropy power and the energy of HOIs. Notably, the energy of HOIs considerably will increase below increased pressure, significantly for the four-site-four-spin alternate interplay, which is substantial and essential to the properties of ML-NiI2. Moreover, by way of atomistic spin dynamics simulations, the coexistence of skyrmions and anti-skyrmions with diameters of at the very least 2 nm are achieved in ML-NiI2 by way of in-plane biaxial pressure, with out the need for an exterior magnetic subject, which is extra conducive to functions for spintronic functions. The introduced outcomes set up ML-NiI2 as a potential candidate for next-generation spintronic gadgets and contribute to a deeper understanding of HOIs in two-dimensional magnets.
