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説明:

We develop a high-throughput method for measuring the composition dependence of magnetoresistance (MR) and spin-transfer-torque (STT) effects in current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices and report its application to the CoFe system. The method is based on the use of composition-gradient films deposited by combinatorial sputtering. This structure allows the fabrication of devices with different compositions on a single substrate, drastically enhancing the throughput in investigating composition dependence. We fabricated CPP-GMR devices on a single GMR film consisting of a CoxFe1-x (0 ≤ x ≤ 1) composition-gradient layer, a Cu spacer layer, and a NiFe layer. The MR ratio obtained from resistance-field measurements exhibited the maximum in the broad Co concentration range of 0.3 ≤ x ≤ 0.65. In addition, the STT efficiency was estimated from the current to induce magnetization reversal of the NiFe layer by spin injection from the CoxFe1-x layer. The STT efficiency was also the highest around the same Co concentration range as for the MR ratio, and this correlation was theoretically explained by the change in the spin polarization of the CoxFe1-x layer. The results revealed the CoxFe1-x composition range suitable for spintronic applications, demonstrating the advantages of the developed method.

権利情報:

• https://creativecommons.org/licenses/by-sa/4.0/legalcode
  

キーワード: magnetoresistance, spin-transfer torque, Co-Fe system, composition-gradient film, high-throughput measurement, combinatorial sputtering

刊行年月日: 2023-12-31

出版者: Informa UK Limited

掲載誌:

• Science and Technology of Advanced Materials: Methods (ISSN: 27660400) vol. 3 issue. 1 p. 2286944-2286944

研究助成金:

• Advanced Storage Research Consortium (ASRC)
• JSPS KAKENHI 21K20434
• JST CREST JPMJCR21O1
• MEXT Initiative to Establish Next-generation Novel Integrated Circuits Centers (X-NICS) JPJ011438

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1080/27660400.2023.2286944

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更新時刻: 2024-01-05 22:13:25 +0900

MDRでの公開時刻: 2023-12-28 12:30:17 +0900