The Computational Analysis of HAMR Media Noise with a Multilayer Micromagnetic Media Model

Heat-assisted magnetic recording (HAMR) media noise is a critical factor in determining HAMR recording performance. In this study, we employ an exchange-coupled multilayer media model to analyze the media noise. We present a computational investigation of THMap metrics, especially the top and bottom edges of the THMap, to extract noise power magnitude. We focus on the cap magnetic properties and interlayer vertical exchange coupling to evaluate their impact on the THMap metrics. We find that introducing the domain wall (“incomplete switching”) into a proper location of multilayer stack reduces the media noise. In parallel, we run recording simulations to relate THMap metrics to the recording performance. These results contribute to a better understanding of future HAMR media design.