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説明:

This study undertakes comprehensive experimental validations based on theoretical predictions of the impact of Er and Tm doping on the magnetic properties of FePt thin films. Initial theoretical investigations indicate that doping with rare earth elements may result in promising alterations to the magnetic properties of the FePt thin films, with Er doping in particular offering a promising avenue for further study. Experimental synthesis via a combinatorial high-throughput sputtering system, which enables precise control over the composition of FePt thin films, achieves the desired magnetic properties. Small quantities of dopants, specifically 0.35 at. % Er, substantially enhance the key magnetic properties of saturation magnetization), anisotropy constant⁠ at room temperature, and the Curie temperature. Precise microstructural observations of a sample show that Er segregates at grain boundaries, voids, and the substrate/FePt interface, where Er preferentially replaces Fe sites. In other regions of the FePt grains, Er is not solid-soluble, and pure FePt and FePtEr form a composite material in the order of tens of nm.

権利情報:

• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Daisuke Ogawa, Yuma Iwasaki, Jun Uzuhashi, Yuta Sasaki, Masato Kotsugi, Yukiko K. Takahashi; Er-driven magnetic tunability in FePt thin films investigated via high-throughput experiments and microstructure analysis for future HAMR media. Appl. Phys. Lett. 23 June 2025; 126 (25): 252405 and may be found at https://doi.org/10.1063/5.0273511.

キーワード: heat-assisted magnetic recording, FePt, combinatorial, high throughput, machine learning, rare-earth doping

刊行年月日: 2025-06-23

出版者: AIP Publishing

掲載誌:

• Applied Physics Letters (ISSN: 00036951) vol. 126 issue. 25 252405

研究助成金:

• National Institute for Materials Science JPMXP1122715503
• Japan Science and Technology Agency JPMJC22C3
• Core Research for Evolutional Science and Technology JPMJCR21O1

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5576

公開URL: https://doi.org/10.1063/5.0273511

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更新時刻: 2025-07-11 08:30:48 +0900

MDRでの公開時刻: 2025-07-11 08:16:43 +0900