基于锁定热成像技术的磁阻材料高通量优化

Rajkumar Modak, Takamasa Hirai, Yuya Sakuraba, Seiji Mitani, Koichi Oyanagi, Takumi Yamazaki, Takeshi Seki, Ken-ichi Uchida
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引用次数: 0

摘要

巨磁阻(GMR)效应是现代自旋电子技术的重要组成部分,研究人员正致力于通过材料探索和设计优化来提高 GMR 器件的性能。然而,传统的 GMR 测量方法在全面优化材料和器件方面效率低下。本研究提出了一种高通量面内电流 GMR 测量技术,该技术基于利用锁相热成像技术(LIT)的焦耳热成像。这种基于 LIT 的技术有利于有效评估具有不同成分和厚度梯度的薄膜,这对于不断探索材料和优化设计以提高 GMR 比率至关重要。首先,研究表明,使用 CoFe/Cu 多层膜,基于 LIT 的简单焦耳加热测量可以定量估算 GMR 比率。然后,为了证实所提出的方法在高通量材料筛选中的实用性,展示了一个案例研究,以研究具有成分梯度的 CoCu 基颗粒薄膜的 GMR。这些技术允许使用单一成分梯度薄膜确定具有最大 GMR 比率的最佳成分,并揭示了 Co22Cu78 是最佳成分,在已报道的多晶 CoCu 基颗粒薄膜中产生了最大的 GMR 比率。这一成果加速了 GMR 器件的材料和结构优化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

High-Throughput Optimization of Magnetoresistance Materials Based on Lock-In Thermography

High-Throughput Optimization of Magnetoresistance Materials Based on Lock-In Thermography

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.

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