ホイスラー合金層を用いた多結晶面直電流型巨大磁気抵抗素子の高出力化
| Project/Area Number |
15J00221
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 国内 |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | National Institute for Materials Science (2016)
University of Tsukuba (2015) |
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Principal Investigator |
ドゥ イェ 国立研究開発法人物質・材料研究機構, 磁性・スピントロニクス材料研究拠点, 外来研究者
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| Project Period (FY) |
2015-04-24 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2016: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2015: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Spin orbitronics / giant magnetoresistance |
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| Outline of Annual Research Achievements |
For the topic of CPP-MR, we have developed a Mg-Ti-O (MTO)-based tri-layer spacer and obtained large MR output in CPP-MR devices using it. Specifically, with a tri-layer spacer of Ag/MTO/Ag, large delta-Vmax over 10 mV is obtained (highest of 16 mV) in our CPP-MR devices with RA of 200-300 mΩ μm2. We find that the large MR output is very likely to originate from the formation of metallic Ag channels penetrating the MTO layer.
For the topic of spin current generation, we have studied the spin Hall magnetoresistance (SMR) in non-magnetic/ferromagnetic (NM/FM) bilayer with novel conductive NM layer. As a result, considerable SMR ratio has been observed in such a bilayer stack, which is comparable to the SMR magnitude observed in stacks with NM being a noble metal such as Pt. The origin of such a SMR can be related to the large spin-orbit coupling in the NM layer or the Rashba-Edelstein effect at the NM/FM interfaces. On the other hand, we have studied the SMR in NM1/FM/NM2 tri-layer stack to investigate how a second interface affects the overall spin-orbit torques (SOTs) in such a system. As a result, we have found that the SOTs are strongly related to the spin diffusion length of FM layer and NM2 layer placed upon it, and specifically, related to the spin transport transparency at the FM/NM2 interfaces. By calculating the respective effective spin mixing conductance of the systems, we quantitatively evaluate the damping-like and field-like SOTs in such a system, providing useful information to the control of SOTs at NM/FM interfaces.
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| Research Progress Status |
28年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
28年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(7 results)
