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Description:

Multi-level magnetic recording is a new concept for increasing the data storage capacity of hard disk drives. However, its implementation has been limited by a lack of suitable media capable of storing information at multiple levels. Herein, we overcome this problem by developing dual FePt-C nanogranular films separated by a Ru-C breaking layer with a cubic crystal structure. The FePt grains in the bottom and top layers of the developed media exhibited different effective magnetocrystalline anisotropies and Curie temperatures. The former is realized by different degrees of ordering in the L10-FePt grains, whereas the latter was attributed to the diffusion of Ru, thereby enabling separate magnetic recording on each layer under different magnetic fields and temperatures. Furthermore, magnetic measurements and heat-assisted magnetic recording simulations showed that these media enabled 3-level recording and could potentially be extended to 4-level recording, as the ↑↓ and ↓↑ states exhibited non-zero magnetization.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Magnetic recording medium, Multilevel recording, HAMR, Advanced characterization, FePt dual layers, Micromagnetic simulation, Read/write simulation

Date published: 2024-03-24

Publisher: Elsevier BV

Journal:

• Acta Materialia (ISSN: 13596454) vol. 271 119869

Funding:

• Government of Japan Ministry of Education Culture Sports Science and Technology
• Japan Science and Technology Agency

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.actamat.2024.119869

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Updated at: 2024-08-23 08:30:11 +0900

Published on MDR: 2024-08-23 08:30:11 +0900