Compensation for the Write Start Transient in Heat-Assisted Magnetic Recording

Heat-assisted magnetic recording (HAMR) uses a laser to heat the magnetic media above its Curie temperature to enable magnetic writing when the write field is limited. However, there are thermal transients caused by the thermal-mechanical response of the head and media when HAMR writing starts. Understanding this transient and compensating for it are critical to successfully implement the HAMR system. In this letter, some possible contributions to the write start transient are discussed. Methods are demonstrated for achieving more uniform recording.