Thermal Simulation for Ultrafast Laser in Multilayered Sample for Heat-Assisted Magnetic Recording Application

Heat-Assisted Magnetic Recording (HAMR) is a promising step in expanding hard disk capacity. This technique depends on the ultrafast laser to demagnetize the layer and record the data on a hard disk or any storage media. However, the recipe for the layers is challenging and gives a space to explore. The investigation of the effects of temperature profile and thermal gradient on the suggested sample FePt (8 nm)/MgO (8 nm)/SiO2 (58 nm)/Si (9.32 E-7 m) for HAMR use was the focus of this study. The simulation of the multilayered gives a view of ultrafast laser behavior (power density 1.7923 E14 W/m2 with an 800 nm wavelength) inside the sample stack. The optical consideration is calculated depending on the incident, reflected, and transmitted light on the surface between layers. Sample layer thickness plays a crucial role in reducing laser power. The temperature gradient inside the sample helps choose the appropriate laser power, which is used with the HAMR technique. Results show the influence of temperature on sample thickness and temperature as laser power. Then, it is obvious which thickness and power laser can be used efficiently.