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説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Magnetic recording medium, Multilevel recording, HAMR, Advanced characterization, FePt dual layers, Micromagnetic simulation, Read/write simulation

刊行年月日: 2024-03-24

出版者: Elsevier BV

掲載誌:

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

研究助成金:

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

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.actamat.2024.119869

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更新時刻: 2024-08-23 08:30:11 +0900

MDRでの公開時刻: 2024-08-23 08:30:11 +0900