Effect of underlayers of laser-assisted magnetic recording media on high-density recording

Katayama, Hiroyuki; Watanabe, Kosuke; Takayama, Kazuhisa; Sato, Jun-ichi; Miyanishi, Shintaro; Kojima, Kunio; Ohta, Kenji
December 2002
Applied Physics Letters;12/23/2002, Vol. 81 Issue 26, p4994
Academic Journal
The effect of underlayers of laser-assisted magnetic recording media has been investigated from the view point of high-density magnetic recording. The frequency response of a carrier-to-noise ratio (C/N) was measured in the media with various kinds of underlayers. It was found that they affect the high-frequency recording capability; the C/N at higher frequencies has been drastically improved for an Al-underlayered recording medium and a C/N of 40 dB was obtained at a recording frequency of 45 MHz and a track width of 0.35 μm. These results are explained by the surface morphology of the underlayer and its pinning effect on the domain-wall motion that is considered to work well for recording smaller stable domains.


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