High frequency characteristics of multi-layered CoTaZr cores for thin film heads

Multilayered cores made of CoTaZr amorphous films with alumina interlayers were prepared and their high-frequency characteristics were investigated in order to develop magnetic thin-film heads applicable to higher transfer rate use. Compared with single-layered cores, head noise and relaxation noises decrease significantly in multilayered cores. Head noise decreases over 20% in the frequency region of 40 MHz, while relaxation noises are reduced gradually as the number of layers increases. These results are attributed to the reduction of eddy current and core losses due to wall motions. Accordingly, multilayered CoTaZr films are expected to be used to fabricate thin-film heads with low noise.<
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