hesela.devHAMR thermal gradient
A HAMR thermal gradient is the spatial rate of temperature change in the recording medium along a specified direction.
A gradient in K/nm is not a cooling rate in K/s; location, direction and the moving heat profile matter [1]. A sharper profile does not by itself guarantee successful switching: pulse duration and field also matter, as illustrated by isolated-grain simulations with spatially uniform heating [2]. Those simulations test temporal dynamics, not a measured full-track spatial-gradient optimization.
Relations
- related
- hamr, curie-temperature-distribution, transition-jitter
Citations
- Hosen and Victora: Impact of Curie Temperature Distribution and Anisotropy Field Distribution on the User Density of HAMR Under Different Thermal Gradients, IEEE Transactions on Magnetics 59(11), 3201005 (2023), doi:10.1109/TMAG.2023.3287829; institutional abstract only
- Meo et al.: Magnetisation dynamics of granular HAMR media by means of a multiscale model, arXiv:2004.13345v1 (2020); sections II.2 and III.2, Figures 2-4