| Cobalt, which is naturally ferromagnetic, provides resistance to demagnetization in several groups of permanent magnet materials. |
| Thermal demagnetization was much more effective and most of the specimens were demagnetized using this technique. |
| The remainder of the collection was subjected to thermal demagnetization in MM2D demagnetizers. |
| Thermal demagnetization was less successful due to large magneto-mineralogical alterations. |
| During the thermal demagnetization procedure each sample was demagnetized with a minimum of ten steps based on a scheme designed after a detailed pilot demagnetization study. |
| The thermal demagnetization of specimens resulted in the identification of five magnetic components. |
