The microstructure in magneto-optical (MO) medium sputtered from an alloy target is a key factor in high-density recording [1], [2]. However, the relationship between the microstructure and the magnetic properties of TbFeCo recording films [3], and the effect of the underlayer in an RE-TM multi-layered structural medium are not so clear. This paper describes the seeding effect of an RE-TM amorphous magnetic unerlayer for growing a TbFeCo memory layer and also discusses the feasibility of high-density recording on an MO medium.
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