Previously we described a method for estimating the thermal conductivity of magneto-optic recording media. The method relies on identifying the laser power that brings the maximum temperature of the TbFeCo layer to as high as the Curie temperature. We extensively use a similar method to estimate the heat capacity of a dielectric layer, a TbFeCo layer, and an aluminum alloy layer of magneto-optic recording media. Measurements are conducted on static disks with a beam of light focused on a TbFeCo layer. The method has the advantage of thermal diffusion depending on a multilayer structure and irradiation time.
© 2002 Optical Society of America
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(210.3820) Optical data storage : Magneto-optical materials
(210.4810) Optical data storage : Optical storage-recording materials
(310.6870) Thin films : Thin films, other properties
Xiaodong Xun, Chubing Peng, and Masud Mansuripur, "Estimation of Thermal Coefficients of Magneto-Optical Media," Appl. Opt. 41, 4596-4602 (2002)