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With the giant magnetoresistance (GMR) effect serving as a vital component in modern spintronic technologies, researchers are dedicating significant efforts to improve the performance of GMR devices through material exploration and design optimization. However, traditional GMR measurement approaches are inefficient for comprehensive material and device optimization. This study proposes a high-throughput current-in-plane GMR measurement technique based on thermal imaging of Joule heating utilizing lock-in thermography (LIT). This LIT-based technique is advantageous for efficiently evaluating films with varying compositions and thickness gradients, which is crucial for ongoing material exploration and design optimization to enhance the GMR ratio. First, it is demonstrated that using CoFe/Cu multilayers, the simple Joule heating measurement based on LIT enables quantitative estimation of the GMR ratio. Then, to confirm the usefulness of the proposed method in high-throughput material screening, a case study is shown to investigate the GMR of CoCu-based granular films with a composition gradient. These techniques allow to determine the optimum composition with maximum GMR ratio using the single composition-gradient film and reveal Co22Cu78 as the optimal composition, yielding the largest GMR ratio among the reported polycrystalline CoCu-based granular films. This demonstration accelerates the material and structural optimization of GMR devices.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Lock-in thermography, Giant magnetoresistance

刊行年月日: 2024-05-24

出版者: Wiley

掲載誌:

• Advanced Physics Research (ISSN: 27511200) vol. 3 issue. 8

研究助成金:

• JST JPMJER2201 (ERATO “Magnetic Thermal Management Materials”)
• JSPS 22H04965 (Grant-in-Aid for Scientific Research (S))
• JSPS 21K14519 (Grant-in-Aid for Early-Career Scientists)
• NEC Corporation
• JSPS P21064 (JSPS Postdoctoral Fellowship for Research in Japan (Standard))

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/apxr.202400021

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更新時刻: 2024-11-11 16:30:25 +0900

MDRでの公開時刻: 2024-11-11 16:30:25 +0900