| Project/Area Number |
20360133
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Tetsuya (財)高輝度光科学研究センター, 利用研究推進部門軟X線赤外チーム, チームリーダー主幹研究員 (70311355)
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| Research Collaborator |
MISTUMATA Chiharu 東北大学, 大学院・工学研究科, 客員教授
TAKAHASHI Hirokazu 東北大学, 大学院・工学研究科, 博士
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2010: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2009: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2008: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Keywords | 物性実験 / 磁性 / 磁気記録 / X線 / 分光 / 交換磁気異方性 / 磁気円二色性 / 磁気異方性 / ハードディスク / MRAM / スピンエレクトロニクス / ハードデイスク |
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| Research Abstract |
A correlation between uncompensated (UC)antiferromagnetic (AF)spins and exchange bias (E. B.)strength was investigated for Mn_<74> Ir_<26>/Co_<100-x> Fe_x bilayers. The E. B. strength had a maximum at x=25 at.%, and the x-ray magnetic circular dichroism of Mn, representing the UC-AF spins, changed systematically in sign and magnitude with respect to x. A linear correlation was found between the E. B. strength and the root mean square magnitude of the UC-Mn spins. The hidden parameter connecting these two quantities might be exchange coupling energy at the hetero-interface, which varies as a function of the ferromagnetic layer composition. Based on the above findings, we succeeded to induce large (> 1. 2 erg/cm^2)E. B. strength on L1_2-Mn_3Ir/Co_<65> Fe_<35> bilayers with inserting an ultra-thin Co-Fe layer which induces large Mn-XMCD.
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