Halbach Array

5 cube magnet halbach array

magnetic card viewer      Halbach array kit      Diagram of halbach array kit     

What is a Halbach array? A Halbach array is a special arrangement of permanent magnets which increases the magnetic field on one side of the device while cancelling the field to near zero on the other side. It is the closest you can get to a one-pole/monopole magnet. In the diagram below, the magnetic field is enhanced on the bottom side and cancelled on the top side (a one-sided flux).

The pattern (on the front face; left, up, right, down) of permanent magnets can be continued indefinitely and have the same effect. It is roughly similar to many horseshoe magnets placed adjacent to each other, with alternating polarity. The effect was discovered by Mallinson in 1973, and these 'one-sided flux' structures were initially described by him as a 'curiosity', although he recognised at the time the potential for significant improvements in magnetic tape technology. In the 1980s, the late Klaus Halbach, a physicist at Lawrence Berkeley National Laboratory, invented the Halbach array to focus accelerator particle beams.

    The kit includes:
  • Aluminium magnet case (8mm x 37.5mm x 12mm)
  • 5 very strong rare earth magnets (cube shaped)
  • 5 grub screws to hold magnets in place (in some cases a spare maybe provided)
  • Alan key to tighten grub screws
  • Magnetic field viewer card
  • Instructions

Note: We have made these kits to be as simple to assemble as possible. It is much easier/stronger than gluing magnets. But assembly still requires a person with good dexterity . Be careful as the magnets are strong and can pinch the skin or fly away from one another.

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Price: £19.99 in

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Ideal for ages 14+.
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