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Magnetic Droplet Crystals

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An illustration of the experimental setup. Ferrofluid drops (black) are caught at the meniscus between oil (orange) and water (blue). An applied magnetic field (arrows) causes the drops to repel one another.

As the strength of the magnetic field increases, the droplets get further apart.

Making the drops larger (right) or stickier (left) changes the crystal pattern, too.

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