R&D: Analytical Estimation of Transition Jitter for HAMR Process

IEEE Magnetics Letters has published an article written by Niranjan Natekar, and R. H. Victora, Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, USA.

Abstract: “In the HAMR process, the transition jitter is known to depend on the grain size as well as the heat spot thermal gradient. We find that the jitter also depends on the Voronoi grain size distribution, as well as exhibiting a surprising non-linear dependence on reader width. Combining the noise due to these dependencies, an analytical formulation is used to estimate the jitter in the HAMR process. The accuracy of the analytical formulation is verified by comparing the predicted jitter to micromagnetic simulations. This simple formulation provides both physical insight and conserves computational time relative to lengthy (and complex) recording simulations.“