Researchers have discovered a magnetic equivalent to electricity: single magnetic charges that can behave and interact like electrical ones. The work is the first to make use of the magnetic monopoles that exist in special crystals known as spin ice. Writing in Nature journal, a team showed that monopoles gather to form a magnetic current" like electricity. The phenomenon, dubbed "magnetricity", could be used in magnetic storage or in computing. Magnetic monopoles were first predicted to exist over a century ago, as a perfect analogue to electric charges. In September this year, two research groups independently reported the existence of monopoles - "particles" which carry an overall magnetic charge. But they exist only in the spin ice crystals. These crystals are made up of pyramids of charged atoms, or ions, arranged in such a way that when cooled to exceptionally low temperatures, the materials show tiny, discrete packets of magnetic charge. Now one of those teams has gone on to show that these "quasi-particles" of magnetic charge can move together, forming a magnetic current just like the electric current formed by moving electrons. The team ... showed that when the spin ice was placed in a magnetic field, the monopoles piled up on one side - just like electrons would pile up when placed in an electric field.

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