40 



BELL SYSTEM TECHNICAL JOURNAL 



short magnets. Because of the lower density of the oxide compared 

 with that of iron, the oxide magnets have approximately the same 

 induction flux as metallic magnets on a weight basis. 



1500 



-1000 



-800 



-600 



-400 -200 200 400 



MAGNETIC FIELD IN OERSTEDS 



600 



Fig. 21 — Comparison of some magnetic characteristics of an oxide magnet with those 

 of carbon steel from Kato and Tolcei^- . 



The description of the materials given here has been obtained from 

 the Japanese publication.^^ So far as is known, no investigation of the 

 preparation or of the properties of the material has been reported in 

 this country. 



Summary of Neiv Permanent Magnet Materials 

 The properties of the new permanent magnet materials discussed are 

 summarized in Table II. 



TABLE II 



The Properties ok Some New Permanent Magnet Materials 



