Magnadur

{{short description|Material invented by Mullard, used for making permanent magnets}}

Magnadur is a sintered barium ferrite, specifically BaFe₁₂O₁₉ in an anisotropic form.{{cite book|page=132|isbn=0-582-35448-X|title=Book of Data |last1=Ellis |first1=Hendrina |last2=Trust |first2=Nuffield-Chelsea Curriculum |date=1984 |publisher=Nuffield-Chelsea Curriculumn Trust }} It is used for making permanent magnets. The material was invented by Mullard and was used initially particularly for focussing rings on cathode-ray tubes. Magnadur magnets retain their magnetism well, and are often used in education, eg. as slabs with poles on the large faces.{{cite web|url=https://spark.iop.org/play-magnets|title=Play with magnets|website=iop.org}}{{cite book|title=Understanding Primary Science: Ideas, Concepts and Explanations|first=Martin W.|last=Wenham|date=18 November 2004|publisher=SAGE Publications Ltd|url=https://archive.org/details/understandingpri0000wenh/page/234|isbn=1412901634|page=[https://archive.org/details/understandingpri0000wenh/page/234 234]}} Magnadur can also be used in DC motors.{{Cite book|title=Magnadur Magnets for Direct Current Motors|date=31 December 1970|publisher=Mullard Ltd|isbn=0901232106}}