Strontium ferrite permanent magnet-An overview

Abstract

<span style="font-size: 15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">Among the permanent magnets hard ferrites, particularly M-type hexagonal ferrites (Sr-Ferrite and Sa-Ferrite) have special place by virtue of their low cost and reasonable magnetic properties. This paper gives a brief introduction of hard ferrites with special reference to strontium ferrite permanent magnet. Processing of, sintered and plastic - bonded magnet has been discussed. The effect of composition of strontium ferrite powders and that of various additives, such as CaO, SiO_{<span style="font-size:12.5pt;mso-bidi-font-size:5.5pt; font-family:" arial","sans-serif""="">2</span>}<span style="font-size:12.5pt; mso-bidi-font-size:5.5pt;font-family:" arial","sans-serif""="">, <span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">AI_{<span style="font-size:13.0pt;mso-bidi-font-size:6.0pt;font-family:" times="" new="" roman","serif""="">2</span>}<span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">O₃, etc. on the magnetic properties have also been outlined.

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