Anisotropy Constant Required for Thermally Assisted Magnetic Recording

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An anisotropy constant Ku required for thermally assisted magnetic recording (TAMR) was calculated. First, a heat transfer simulation was carried out to obtain the thermal gradient of media at the time of writing for the Ku calculation. Both the Curie temperature Tc and Ku should be designated for TAMR media design. Ku is a function of Tc. Therefore, we introduce a parameter Ku / Kbulk that shows the intrinsic ratio of film Ku to bulk Ku. From the information stability conditions, we estimated whether or not the media have the potential for TAMR. The limiting factor is the thermal gradient related to the information stability on the trailing side located 1 bit from the writing position during writing and at the adjacent track during rewriting, and the limiting factor determines the minimum Ku / Kbulk. Therefore, the minimum Ku / Kbulk strongly depends on the thermal gradient. Consideration was also given to the dependence of the grain number per bit on Ku / Kbulk, the dependence of the standard deviation of the grain size on Ku / Kbulk, the dependence of the thickness of the recording layer on Ku / Kbulk, and the dependence of the writing temperature on Ku / Kbulk.

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