New grade of temperature compensated samarium cobalt permanent magnets and design considerations

Electron Energy has successfully developed a new grade of zero Reversible Temperture Coeffeicient (RTC) magnets with maximum energy product, (BH)
_max
, of 18.0 MGOe and H
_k
> 12 kOe. The new grade of zero RTC 18 augments the existing product line and surpasses the prior highest energy zero RTC grade with a (BH)max of 16 MGOe. The RTC of the newly developed magnets is suitable for TWT applications where little change in magnetic induction, B
_r
, over a wide temperature range of up to -50deg to +150degC is desired. Excellent magnetic properties were obtained with reversible temperature coefficients on the order of -0.001% /degC .