Oriented Strontium Ferrite Disc Magnet: Less Iron Oxide, 10,000 Oersted Field (Gorter, Philips 1956, Ex. 9)

A strontium ferrite magnet with less iron oxide than Example 8, oriented, heated and sintered as in Example 4. In the principal direction it held 2,700 gauss with a coercive force of 2,900 oersted and a (BH)max of 1.67 × 10⁶. Source: E. W. Gorter, G. W. Rathenau and A. L. Stuyts (Philips), US 2,762,778 (1956), Example 9. They made blocks; disc size is ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.