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Superconducting hose transmits magnetic field

发布时间:2017-12-22 06:01:31来源:未知点击:

CALL it a magnet’s answer to optical fibres: a hose that can carry magnetic fields a long distance. The strength of a magnetic field drops off quickly, which is why fridge magnets don’t fly across the kitchen. Now, Carles Navau of the Autonomous University of Barcelona in Spain and colleagues have sent a field 4 centimetres. They made a hose from a cylinder of superconducting material filled with a highly magnetic cobalt-iron alloy, then ran a current through a coil at one end to produce a field (arxiv.org/abs/1304.6300). The field that leaked out of a crack in the tube 4 cm away was only about 40 per cent weaker than at the centre of the coil. Much longer distances should be possible,