| Project/Area Number |
19K15429
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 29010:Applied physical properties-related
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| Research Institution | Tohoku University |
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Principal Investigator |
Al-Mahdawi Muftah 東北大学, 先端スピントロニクス研究開発センター, 助教 (90729576)
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | spintronics / sensors / YIG / PtMn / Vortex / sensor / Kerr microscopy / noise / deep learning |
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| Outline of Research at the Start |
The spintronic sensors based on magnetic tunnel junctions (MTJs) are promising in the domains of Internet-of-Things (IoT), automotive, biomedical, etc. A main obstacle is the intrinsic magnetic noise processes. In this research, two goals will be developed: (1) analyze the microscopic origins of magnetic noise using magnetic domain images, and (2) develop new MTJ sensing devices that decrease noise by 1000 times.
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| Outline of Final Research Achievements |
The spintronic sensors based on magnetic tunnel junctions (MTJs) are promising in the domains of Internet-of-Things (IoT), automotive, biomedical, etc. A main obstacle is the intrinsic magnetic noise processes. In this research, we investigated the origin of noise in MTJ sensors, and we designed new thin-film sensing layers. First, we clarified the microscopic origins of magnetic noise using magnetic domain imaging. We found that the magnetic domain wall fluctuations are a major contribution to low-frequency noise. Secondly, we investigated new sensing layers of: (a) permalloy/platinum manganese exchange-coupled layers, (b) vortex formation in circular sensing devices, and the control of sensitivity in the vortex-type MTJs, and (c) yttrium iron garnet thin films.
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| Academic Significance and Societal Importance of the Research Achievements |
We clarified an origin of magnetic noise in magnetic tunnel junction sensors, and developed new sensing devices and materials. This advances understanding of magnetic fluctuations in micro-sized sensors, and adds to applications in cheap low-power sensors, such as IoT and biomedical fields.
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