Abstract
Use of magneto-optical (MO) medium sputtered from an intermetallic compound alloy target has advantages for mass production but may not be suitable for high-density recording due to its poor perpendicular magnetic anisotropy. The relationship between Ms Hc, the product of saturation magnetization Ms and coercivity Hc, and film microstructure is discussed in this paper; we obtained an Ms Hc of 1.3 × 106 erg/cm3 using microcolumnar structure even when the medium was sputtered from an alloy target. By adopting this film for the memory layer in a DWDD system, tiny marks less than 100 nm in size can be reliably written. As a result, high-density recording at 15 Gbit/inch2 is achieved.
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