The Signal Corps Program on Magnetic Ferrites

The ferrite research and development program pursued by the Signal Corps over the past twelve years is reviewed and its most significant results are described. The discussion includes all major phases and sub-tasks under this program; such as the work on low-loss high-permeability materials for communication uses at frequencies from 0.1 to 500 Mc, square hysteresis loop ferrites for computer applications, work on permanent magnet materials, and materials for microwave applications up to 100 kMc. In addition, studies dealing with the effect of impurities, preparation techniques, grain size and other parameters on certain material characteristics are mentioned briefly. A list of publications originating from this work is included.