Imposition of periodic magnetization patterns on high-energy-product magnetic plates

Periodically magnetized permanent magnet plates with high-energy products are potentially very useful in high-field structures such as free-electron lasers, electrical machinery, and various mechanical applications such as magnetic bearings, for which they are already being used. A major problem is the lack of field sources with sufficient field amplitude to impose such patterns of magnetization on high-coercivity materials. This paper shows how such high amplitudes can be obtained for several patterns by use of modified sources of the augmented ‘‘magic ring’’ and ‘‘magic sphere’’ types.