Granular micromagnetic HAMR model: investigation of damping dependence and parametric optimization for high performance

W. Pantasri, A. Meo, R. W. Chantrell, P. Chureemart, J. Chureemart*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Heat assisted magnetic recording (HAMR) is a novel high-density magnetic recording technology that relies on thermal assist from a laser during the writing process. To achieve high writing performance, it is important to study and optimize the crucial factors affecting the magnetization reversal mechanism at elevated temperature. In this work, we use a multiscale approach that combines atomistic and micromagnetic models to study the magnetization reversal behavior in the recording medium. The atomistic model allows to parameterize accurately the macroscopic approach, which is utilized to model the system and its dynamics. We perform a parametric investigation of the switching properties as a function of the HAMR setup characteristics as well as the material properties, such as magnetic damping. The results show that high damping and moderate external fields can achieve high-performance HAMR media characterized by high switching probability, short switching time and low peak temperature. We demonstrate that switching occurs via the linear reversal mechanism. By systematic variation of the longitudinal susceptibility we force a transition to coherent reversal and demonstrate that this reduces the switching probability, showing linear reversal to be an important component within the HAMR process.

Original languageEnglish
Article number085001
Number of pages8
JournalJournal of Physics D: Applied Physics
Issue number8
Early online date4 Dec 2023
Publication statusPublished - 23 Feb 2024

Bibliographical note

Funding Information:
J C and P C gratefully acknowledge the support from Mahasarakham University. W P would like to acknowledge PhD funding from Seagate technology (Thailand).

Publisher Copyright:
© 2023 IOP Publishing Ltd.


  • damping constant
  • heat-assisted magnetic recording technology
  • multiscale models
  • switching probability

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