Abstract
A laser-assisted magnetic recording method is expected to be suited for high-density recording [1-3]. TbFeCo media are desirable for the laser-assisted magnetic recording because they have high perpendicular magnetic anisotropy and coercivity. However, small magnetic domains on TbFeCo media tend to be recorded irregularly in size by their wall motion due to the strong exchange coupling. Recently, it was demonstrated that a NiP underlayer weakens the exchange coupling of a TbFeCo film [4]. We have also reported that an Al-underlayered TbFeCo medium improves the recording density drastically [5]. A thin Al underlayer has dense and minute grain structures; thereby, these structures become the pinning sites of domain-wall movement. In this paper, we report the dependence of recording density on Al underlayer thickness. We investigated the effect of the Al underlayer thickness from the viewpoint of a read/write performance.
© 2003 Optical Society of America
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