Modified Strontium Ferrite, a New Permanent Magnet Material
- 1 April 1963
- journal article
- conference paper
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 34 (4) , 1273-1274
- https://doi.org/10.1063/1.1729468
Abstract
A review of the magnetoplumbite magnet development is given from the early magnets of Takei to the recent high energy barium ferrite magnets of Tomholt. A method for rapidly testing a large number of ferrite permanent magnet specimens is described which was used on several thousand specimens. The results are summarized for portions of the ternary systems M1O·M2O·Fe2O, where M1 and M2 stand for Ba, Sr, Pb, or Ca. A modified strontium ferrite magnet could be developed which appears to have a higher magnetic energy than any other oxide magnet material previously known. Typical values are: Br=4100 G, IHc=3000 Oe, (BH)max=4.0 mgo. At lower coercive forces and under careful laboratory conditions, modified strontium ferrite magnets can be prepared with a (BH)max approaching 5 mgo. A number of permanent magnet applications are mentioned for which the new material is most suitable.This publication has 2 references indexed in Scilit:
- Oxydische Dauermagnete aus Bariumoxyd und Eisen(III)-oxydArchiv für das Eisenhüttenwesen, 1953
- Über ein neues oxydisches Mineral aus Långban. (Magnetoplumbit.)Geologiska Föreningen i Stockholm Förhandlingar, 1925