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The signal-to-noise performance of heat-assisted magnetic recording (HAMR) is closely related to media magnetic and thermal property distribution, especially with the grain-to-grain variations in Curie temperature ($T_{c}$ ) or $T_{c}$ distribution ($\sigma T_{c}$ ). In this paper, we report an experimental study on $T_{c}$ variations and related switching field distributions (SFDs) in FePt-based...
A method based on the detection of the variation of the reflected laser beam's optical divergence was used to detect the temporary thermal protrusion at the laser heating spot.
With recent developments in Heat Assisted Magnetic Recording (HAMR), there is growing intense interest in the thermal-optical properties of the HAMR media. We detect the phase change of the optical beam as it reflects from a FePt thin film under strong thermal gradient by carrying out Close-Aperture reflection Z-scan experiments. It was found that the far field spatial distribution of the reflected...
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