CoFeB/MgO/CoFeB-Based Magnetic Tunnel Junction Using Soft Magnetic Composite Free Layer with TaFeB Spacer

Takafumi Nakano, Kosuke Fujiwara, Seiji Kumagai, Yasuo Ando, Mikihiko Oogane

研究成果: 書籍の章/レポート/Proceedings会議への寄与査読

抄録

CoFeB/MgO/CoFeB-based magnetic tunnel junctions (MTJs) with a soft magnetic composite free layer have been studied for an ultra-sensitive magnetic sensor. Further improvement to the tunnel magnetoresistance (TMR) ratio is still required, which has been hindered by a trade off between the TMR ratio and interlayer exchange coupling (IEC) depending on the spacer thickness of the composite free layer. In this study, we developed a TaFeB spacer to replace the conventional Ta spacer in the sensor-type MTJ and solve the aforementioned trade off. The TaFeB spacer had a wider thickness window of the IEC than the case of pure Ta. This allowed us to increase the TaFeB thickness up to 1.0 nm, resulting in an improved TMR ratio of 234% which is higher than the case using the Ta counterpart. The TaFeB spacer enables us to break the ceiling of the sensor-type MTJs, leading to a higher sensitivity.

本文言語英語
ホスト出版物のタイトル2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings
出版社Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9798350338362
DOI
出版ステータス出版済み - 2023
イベント2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Sendai, 日本
継続期間: 2023 5月 152023 5月 19

出版物シリーズ

名前2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings
2023-January

会議

会議2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023
国/地域日本
CitySendai
Period23/5/1523/5/19

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