Analysis of magnetostriction effect in ferrite heads

We made single crystal ferrite heads with various thermal stress by changing the annealing temperature, and we traced the source of the poor performance by experiments. As a result, we revealed that the deterioration of the ferrite permeability near the gap determines, in large part, the operating characteristics of the ferrite head. Considering the result, we developed a calculation method that enables us to estimate the relationship between head characteristics and magnetoelastic effect in ferrite heads.