This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to audio speakers. Oh, and without it we’d live in eternal darkness.

Researchers have shown that certain metal-organic materials can act as permanent magnets at temperatures of up to 242 °C, while remaining magnetized in external magnetic fields as strong as 7500 ...

'Soft robots,' medical devices and implants, and next-generation drug delivery methods could soon be guided with magnetism -- thanks to a metal-free magnetic gel developed by researchers. Carbon-based ...

A simple one-step process recovers more than 90% of rare earth elements (REEs) from magnets ( Proc. Natl. Acad. Sci. U.S.A. 2025, DOI: 10.1073/pnas.2507819122).