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Current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices are promising candidates for next-generation hard disk drive read heads due to their low resistance-area product and high-speed operation. This study investigates Cu-based binary alloys (Cu-X) as alternative spacers to conventional Ag spacer in Co2FeGa0.5Ge0.5 (CFGG)-based CPP-GMR devices using first-principles calculations. Majority-spin ballistic conductance, which is essential in the large spin-asymmetry of the interface resistance, was evaluated for CFGG/Cu-X/CFGG(001) trilayers in comparison with CFGG/Ag/CFGG(001) trilayer. The results show that several spacer materials have possibilities to enhance the MR ratio compared to Ag. In particular, we found that B2-CuZn will be the most suitable for CFGG electrode. The large majority-spin conductance of CFGG/CuZn/CFGG(001) is attributed to p-d hybridization between CFGG and Cu s-states near the Γ point, which enhances electron transport efficiency,
while the thermal stability of the interface spin-moment at CFGG/CuZn(001) is slightly smaller than that of CFGG/Ag(001). Finally, we proposed that the insertion of Ag layer between the CFGG and CuZn interfaces will enhance not only the spin-asymmetry in the interface resistance but also the thermal stability of the interface spin-moment.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  This is the Accepted Manuscript version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6463/ae06ad.

キーワード: CPP-GMR, half-metal, first principles calculation, Heusler alloy

刊行年月日: 2025-09-29

出版者: IOP Publishing

掲載誌:

• Journal of Physics D: Applied Physics (ISSN: 00223727) vol. 58 issue. 39 p. 395303-

研究助成金:

• Core Research for Evolutional Science and Technology JPMJCR21O1
• Ministry of Education, Culture, Sports, Science and Technology JPJ011438
• Japan Society for the Promotion of Science 21H01608

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1088/1361-6463/ae06ad

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更新時刻: 2026-04-30 12:01:11 +0900

MDRでの公開時刻: 2026-09-24 08:37:00 +0900