Abstract: Disclosed is an apparatus and process for magnetizing permanently magnetizable strip and sheet material to form a pattern of band-like poles on the material. Two parallel stacks of permanent magnets are used, each magnet in each stack having a direction of magnetization which is perpendicular to a slot-like air gap between the stacks. The magnets in each stack are parallel to one another, with unlike poles of adjoining magnets proximate so that they mutually attract one another. Unlike poles of the respective magnets in opposite stacks are positioned diametrically opposite each other across the air gap. The apparatus does not use electromagnetic coils and can form very narrow, contiguous band-like poles on magnetizable sheet or strip material which is passed through the air gap.

Abstract: A permanently magnetizable composite is made from rare earth permanent magnet material by incorporating coarse particles of the material into a workable binder at a gradual rate such that sparking and combustion are avoided, until the particles are coated with or embedded in the binder, and then working the mixture under shearing forces sufficient to break up the particles in situ, thereby forming much finer particles directly within the binder. Extremely high particle packing fractions can be obtained in this manner, yet the residual induction of even an isotropic composite substantially exceeds the maximum that would be expected for a magnet having that packing fraction.