Two-dimensional (2D) spintronics has emerged as a rapidly growing field due to its potential for the precise manipulation of electron spins in nanoscale devices. In this work, we investigate the magnetic properties of Janus $\text{CrI}X$ ($X=\mathrm{Cl}$, Br) monolayers using first-principles calculations and atomistic spin simulations. Our study reveals that the magnetic ground state of $\text{CrI}X$ is a helical spin spiral driven by intrachain isotropic Heisenberg frustration. Crucially, the broken inversion symmetry of the Janus structure induces a nonnegligible in-plane Dzyaloshinskii-Moriya interaction (DMI) while the low-symmetry spin-orbit-coupled environment also gives rise to substantial symmetric anisotropic exchange, which modulate the helical spin texture with a tilted spiral plane. By applying an external electric field, we demonstrate the ability to modulate these magnetic interactions through the interplay with the built-in electric field, resulting in a tunable deviation of the spin-spiral plane angle and wavelength. This direct correlation between the electric field and magnetic order highlights the magnetoelectric coupling in $\text{CrI}X$, establishing Janus $\text{CrI}X$ as a model 2D platform for studying electrically tunable noncollinear magnetism.

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• Magnetic interactions
• Magnetoelectric effect
• Monolayer films
• Two-dimensional electron system
• Density functional calculations
• Monte Carlo methods