ABSTRACT
The market for special magnetic devices is rapidly expanding. Growth is particularly strong in the medical area, where they are used for artificial hearts, artificial limbs, electronically operated heart valves, etc. (Glinka et al. 1995, Young and Pawlak 1990). However, as the number of applications grows, the specifications the devices are expected to meet become more and more demanding. Increasingly smaller devices are required to operate artificial hearts and limbs.
