The domain structures of cores with patterned six-layered CoNiFePd films with alumina interlayers are investigated using spin-polarized SEM in order to develop magnetic thin film heads with narrow track widths. The films produced exhibit virtually single domains in the middle of the magnetic cores, and the direction of the magnetization is parallel to the easy axis of the films. Around the pattern edge, however, the cases exhibit a region where the magnetization orients along the pattern edge. At the pole tip, the ratio of the edge domain at the pole width increases as the track width becomes narrow. It is important to prevent the enlargement of such a region so as to maintain the permeability at the pole tip. This domain structure remains stable for different magnetization conditions. Stable domain structures in each magnetization condition are expected to be necessary for the readout waveform without distortions. Accordingly six-layered coNiFePd with single domains are suitable for magnetic thin film heads with narrow track widths.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering