| 摘要 |
A crystallized ferromagnetic layer containing Fe, Co and/or Ni, formed as a polycrystalline ferromagnetic layer is used as a part of the anti parallel soft under layer (APS-SUL) structure in perpendicular media to reduce the thickness of the intermediate layer. The soft under layer structure consists of a non-magnetic spacer layer, whose thickness is adjusted to form an effective anti-parallel coupling between the two ferromagnetic layers. The magnetic coupling is formed in anti-parallel directions between a lower layer made up of an amorphous ferromagnetic layer and an upper layer made up of an amorphous ferromagnetic layer and the polycrystalline ferromagnetic layer. The effective magnetization of the soft under layers at remanence is zero. The preferred thickness of the polycrystalline ferromagnetic layer is 1 nm to 20 nm. An intermediate layer, such as Ru, is formed directly on the magnetic polycrystalline soft under layer and has a thickness of about 10 nm to 20 nm. The recording magnetic layers and protective layers are formed on the intermediate layer.
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