Tri-layer magnetic super resolution (MSR) media was designed and fabricated for use with center aperture detection. Because short wavelength recording will be essential in achieving ultra-high density disks, the media was tested on a blue light (488 nm) magneto-optic spin stand to evaluate its MSR performance. A single layer TbFeCo disk was also prepared as a standard. Since the MSR disk forms an effective read-out aperture smaller than the diffraction limited spot size, it was observed that the tri-layer disk yielded larger carrier-to-noise ratio than the conventional TbFeCo disk for sub-micrometer mark lengths as small as 0.2 micrometers.
S. E. Kabakoff,
Duane C. Karns,
Mark H. Kryder,
"Blue wavelength magnetic superresolution", Proc. SPIE 3109, Optical Data Storage 1997 Topical Meeting, (30 July 1997); doi: 10.1117/12.280697; https://doi.org/10.1117/12.280697