抄録
Two-dimensional read/write simulation based on the Maxwell equations was performed by a finite element method on a system consisting of a keepered medium (KM) with a thin soft magnetic layer (keeper layer) over a recording layer and a thin-film head. In the write process, the KM is given a weaker head field than the UKM. But the KM’s magnetization is larger than that of the UKM because of an image effect in the write and after-write processes. In the read process, the keeper layer reduces the practical spacing by means of the image effect, and improves the read resolution by introducing a virtual gap (VG). Then, the keeper layer with the optimum parameters (e.g. μ = 100, t = 15 nm, Bs = 1.5 T) decreases the demagnetizing field in the recording layer (e.g. Mr = 560 kA/m, t = 36 nm, Hc = 167 kA/m) by 1/2, and increases the recorded magnetization by 1/4. As a result, the thermal stability of the recording magnetization can be doubled. Therefore, the KM will be an attractive medium with better thermal stability if the optimum parameters are chosen.
