A Halbach array is nothing more than a special arrangement of permanent magnets that results is a magnetic field in only one side while cancelling the field to near zero on the other side. It is accomplished having a spatially rotating pattern of magnetisation. These above mentioned rotating patterns can be continued indefinitely to have the same effect. It works on the principle that any magnetization pattern where the components of magnetization are ?/ 2out of phase with each other will result in a one-sided flux.
This phenomenon was first discovered by John C. Mallinson in 1973 but later it was renowned Physicist Klaus Halbach in 1980 that invented the Halbach array to focus particle accelerator beams while at the Lawrence Berkeley National Laboratory.
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