Manufacturers
| AFT MICROWAVE | http://www.aft-microwave.com |
| Countis Laboratories | http://www.countis.com |
| Ferrite Domen | http://www.domen.ru |
| Magneton | http://www.magneton.ru |
| MCV Technologies, Inc. | http://www.mcvtech.com |
| TCI Ceramics, Inc. | http://www.magneticsgroup.com/tci.htm |
| Temex-ceramics | http://www.temex-ceramics.com |
| Trans-Tech Inc. | http://www.trans-techinc.com |
Meterial
| Type | History | 4πMs | Tc |
| Mgx Mny Fez O4 | 1952 | 2000-2400Gs | 270-300℃ |
| Ni1 Fe2 O4 | 1953 | 3200Gs | 560℃ |
| Y3 Fe5 O12 | 1956 | 1780Gs | 280℃ |
| Li0.5 Fe2.5 O4 | 1962 | 3600Gs | 645℃ |