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Collective behavior widely exists in nature, ranging from the macroscopiccloud of swallows to the microscopic cloud of colloidal particles. The behaviorof an individual inside the collective is distinctive from its behavior alone,as it follows its neighbors. The introduction of such collective behavior intwo-dimensional (2D) materials may offer new possibilities to achieve desiredbut unattained properties. Here, we report a highly sensitive magneto-opticeffect and transmissive magneto-coloration via introducing collective behaviorinto magnetic 2D material dispersions. The increase of ionic strength in thedispersion enhances the collective behavior of colloidal particles, giving riseto a magneto-optic Cotton-Mouton coefficient up to 2700 T-2m-1 which is thehighest value obtained so far, being three orders of magnitude larger thanother known transparent media. We also reveal linearly dependence ofmagneto-coloration on the concentration and hydration radius of ions. Suchlinear dependence and the extremely large Cotton-Mouton coefficientcooperatively allow fabrication of giant magneto-birefringent devices forcolor-centered visual sensing.

Collective Behavior Induced Highly Sensitive Magneto-Optic Effect in 2D Inorganic Liquid Crystals