The pastes are engineered that way. To compensate for this behavior, different pastes were fired with each at a different thickness to find one that would give a preferred resistance. The ferrite must be given time to discharge, and the RC time constant for the ferrite would be about 17.5 s. The results of the firing were not precise as seen in Table 1 in the appendix. Large differences in the resistances across the ferrites can be seen, but they are all acceptable.
None are so high as to prevent the ferrite adequate discharge time between proton injections.
One may notice a trend in the resistances with regards to the placement of the ferrite in the furnace. It seems the back of the furnace is hotter than the front. This causes a lower resistive film to form in the back. As mentioned above, this film is usually put on alumina. One of the major differences between alumina and Ni-Zn ferrites is their crystal structures.