Recent Developments in the Field of Elongated Single-Domain Iron and Iron-Cobalt Permanent Magnets

Abstract

The experimental physical and magnetic properties of elongated single‐domain permanent magnets have been previously reported and are briefly reviewed with respect to their means of preparation. A successful process is described for making ESD magnets available commercially at a limited initial rate. The material produced is described and contains elongated single‐domain particles of iron or iron‐cobalt embedded in a metallic matrix to protect them from environmental attack. Maximum magnetic energies of 2.2 megagauss‐oersteds for iron and 3.6 megagauss‐oersteds for iron‐cobalt are available.