In few-layer NiI2, increasing thickness rotates and lengthens the spin spiral wavevector, while wrinkles deflect it locally, establishing thickness and strain as tuning knobs for this 2D multiferroic.
The thickness dependence of q reveals how interlayer interactions reshape the spin spiral state
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Dimensional crossover and local strain induced deflection of the spin spiral state in multiferroic NiI2
In few-layer NiI2, increasing thickness rotates and lengthens the spin spiral wavevector, while wrinkles deflect it locally, establishing thickness and strain as tuning knobs for this 2D multiferroic.