垂直2層媒体の記録信号の安定性の外乱磁場方向依存性  [in Japanese] Dependence of the Signal Stability of Double-Layer Perpendicular Magnetic Recording Media on the Directions of the Applied Magnetic Fields  [in Japanese]

Double-layer media with single-pole heads are ideal for perpendicular magnetic recording. However, the problem of unstable recorded magnetization due to the magnetic domains of underlayers has not yet been solved. We investigated the dependence of the signal stability of a medium with an Ni-Fe underlayer and a medium with an Fe-Si-Al underlayer on the directions of the applied magnetic fields under an SPT headloaded condition and an ID/MR head-loaded condition. The results show that the recorded signal has better stability with a horizonal field than with a vertical field. They also show that the recorded signal has better stability under the ID/MR headloaded condition than under the SPT head-Loaded condition.