Systems and methods for extracting Curie temperature distribution in heat assisted magnetic recording media

A system for extracting a Curie temperature distribution in a heat assisted magnetic recording medium, the system comprising:

• a magnetic recording medium;
• a spindle configured to rotate the medium;
• a magnet adjacent to the medium and configured to generate a magnetic field;
• a laser configured to direct light on the medium;
• a light detector configured to detect light reflected from the medium;
• and
• a processor coupled to the spindle, the magnet, the laser, and the light detector, the processor configured to:
• saturate the medium by causing the laser to direct light on the medium and causing the magnet to generate a magnetic field on the medium;
• cause the magnet to remove the magnetic field on the medium;
• write to the medium by causing the laser to direct light on the medium;
• record measurements of light reflected from the medium made by the light detector;
• convert the measurements of reflected light into measurements of remanent thermal magnetization;
• and
• extract the Curie temperature distribution from the measurements of remanent thermal magnetization.