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TEM studies of cobalt-rare earth permanent magnets

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1 Author(s)
Livingston, J.D. ; General Electric Company, Schenectady, N.Y.

The microstructures of several cobalt-rare earth magnet alloys from various laboratories were examined by transmission electron microscopy (TEM). The magnets varied in alloying elements and in z , the ratio of transition-metal to rare-earth atoms. Matsushita magnets with z\sim8 had a relatively featureless microstructure. Toshiba magnets with z\sim7 contained a fine cellular microstructure, and Brown-Boveri magnets with z=7.8 contained fine isolated precipitates plus a partly-formed cellular structure. These observations are consistent with magnetization hehavior, which indicated nucleation-controlled coercivity for the z\sim8 magnets and pinning-controlled coercivity for the z\sim7 and z=7.8 magnets. Results are compared with earlier TEM studies.

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Magnetics, IEEE Transactions on  (Volume:14 ,  Issue: 5 )