These little magnets are made of liquid. But unlike the dancing ferrofluids you've probably seen elsewhere on YouTube, they stay magnetized even without the presence of external magnets.
A team writing this week in Science found that jamming iron-based nanoparticles at the interface of two liquids led to this characteristic. The liquid magnets can be shaped and moved by magnetic forces, electricity, and pH.
Read more: https://science.sciencemag.org/content/365/6450/264
Credit: X. Liu et al., Science 2019
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