薄膜磁気ヘッドの高周波磁化挙動

抄録

The magnetization response of thin-film heads in the high frequency region was studied using the Scanning Kerr Effect Microscope. The area of large magnetization rotation converges gradually to the center portion of the core of a thin-film head as the frequency is increased. Over 20 MHz, the domain structure changes; i.e., the number of domains increases with increase in frequency and the curvature of both sides of the 180° walls becomes gradually small. In result, the convergence region of the magnetization rotation becomes wider. Compared with the static magnetization direction and the magnetization response, at the high frequency the magntization along the track direction in static rotates large, while that slanted from the track direction rotates small.