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.
Sample Preparation: Few-layer NiI2 film were grown by molecular beam epitaxy (MBE) on highly oriented pyrolytic graphite (HOPG) and graphitized SiC(0001) substrates
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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.