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Heat-assisted magnetic recording (HAMR) is a promising high-density data storage technology whose intensive practical deployment requires a perfect balance of many factors, including device reliability, which is challenged by severe writing conditions. In this work, we propose HAMR media composed of Fe-Pt/Ru/Fe-Pt trilayer nanograins embedded into a carbon segregating matrix. When the Ru nonmagnetic spacer is thinner than 2~nm, the Fe-Pt layers were found to be exchange-coupled and exhibit different Curie temperatures, which is beneficial for lowering the HAMR writing temperature. Given the grain size of 17~nm, sufficient thermal stability was preserved according to the time dependence of coercivity analyzed using the Sharrock equation. The granular microstructure of Fe-Pt/Ru/Fe-Pt films with different Ru thicknesses was examined in detail, while their magnetic properties were interpreted by micromagnetic simulations distinguishing the properties of individual Fe-Pt layers. Grain size reduction, suppression of in-plane variants, improvement of the degree of L10 order in the top Fe-Pt layer - all these are further steps to optimize the developed exchange-coupled Fe-Pt/Ru/Fe-Pt nanogranular films, that would open a new avenue for tuning the HAMR media toward its ultimate performance.

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• In Copyright
  

  ©2024 American Physical Society

Keyword: Heat-assisted magnetic recording (HAMR), exchange-coupled media, FePt, Curie temperature

Date published: 2024-11-21

Publisher: American Physical Society (APS)

Journal:

• Physical Review Applied (ISSN: 23317019) vol. 22 issue. 5 054060

Funding:

• JST CREST JPMJC22C3
• MEXT program JPMXP1122715503 (Data Creation and Utilization-Type Material Research and Development Project)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5018

First published URL: https://doi.org/10.1103/physrevapplied.22.054060

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Updated at: 2024-11-23 16:30:27 +0900

Published on MDR: 2024-11-23 16:30:28 +0900