Heat-assisted magnetic recording (HAMR) employs a laser-coupled near-field transducer (NFT) in the write head to locally heat the FePt recording layer. HAMR features larger temperature gradients producing higher effective field gradients at the recording transitions than PMR recording. Yet, the distributions of the FePt grains’ magnetic properties, if too large, limit the system’s areal density performance. It is therefore important to characterize the magnetic property distributions for each media, at time scales and temperatures at which the magnetic recording takes place. I will present a measurement method called THMap that uses conventional recording systems to extract the temperature and field distributions of HAMR media at recording time scales. This method also provides useful information about the head/medium recording system. If time allows, I will also touch upon optical and thermal design considerations for HAMR media looking at the relevance of anisotropic heatsinks for heat-assisted magnetic recording (HAMR).

Plus d'information : https://www.spintec.fr/seminar-characterization-of-the-switching-distributions-of-heat-assisted-magnetic-recording-media/