Dependence of HAMR Transition Curvature on Bit Length

Kun Xue, R. H. Victora

Research output: Contribution to journalArticlepeer-review


Transition curvature is a major contributor to transition broadening in current HAMR devices. In this paper, in order to clarify HAMR performance versus bit length, a detailed study of the dependence of HAMR transition curvature on bit length is presented. With the help of micromagnetic simulations, HAMR bits with three different bit lengths (10.5, 15, 21nm) are written and transition curvatures are calculated. Both thermal ECC media and pure FePt media are tested. By tracking the change of transition curvature during the HAMR cooling process, an erase-after-write effect is observed. DC-erased media, intergranular exchange and removal of dipole interactions are also examined for potential optimization of the HAMR system.

Original languageEnglish (US)
JournalIEEE Transactions on Magnetics
StateAccepted/In press - 2021

Bibliographical note

Publisher Copyright:


  • Cooling
  • HAMR
  • Heat-assisted magnetic recording
  • Heating systems
  • Media
  • Micromagnetic Simulation
  • Micromagnetics
  • Perpendicular magnetic anisotropy
  • Saturation magnetization
  • Thermal ECC media
  • Transition Curvature


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