| Project/Area Number |
22246091
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
HONO KAZUHIRO 独立行政法人物質・材料研究機構, 磁性材料ユニット, フェロー (60229151)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Yukiko 独立行政法人物質・材料研究機構, 磁性材料ユニット, 主幹研究員 (50421392)
HAYASHI Masamitsu 独立行政法人物質・材料研究機構, 磁性材料ユニット, 主任研究員 (70517854)
ラジャニカンス アマナブロル 独立行政法人物質・材料研究機構, 磁性材料センター, NIMSポスドク研究員 (40515590)
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| Co-Investigator(Renkei-kenkyūsha) |
MITANI Seiji 独立行政法人物質・材料研究機構, 磁性材料ユニット, グループリーダー (20250813)
KASAI Shinya 独立行政法人物質・材料研究機構, 磁性材料ユニット, 主任研究員 (20378855)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥49,920,000 (Direct Cost: ¥38,400,000、Indirect Cost: ¥11,520,000)
Fiscal Year 2013: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥36,270,000 (Direct Cost: ¥27,900,000、Indirect Cost: ¥8,370,000)
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| Keywords | 磁性材料 / スピントロニクス / ハーフメタル / ホイスラー合金 / スピン分極率 / CPP-GMR / 巨大磁気抵抗 |
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| Research Abstract |
We have explored highly spin polarized ferromagnetic Heusler alloys by point contact Andreev reflection measurements. Among various Co2Fe(Z,Z') and Co2Mn(Z,Z') alloys that we explored, we found Co2Fe(Ga,Ge) and Co2Mn(Ga,Ge) alloys are of a particular interest in view of their high spin polarization.
Using these Heusler alloys as FM layers in combination with Ag, Cu, NiAl, Cu2TiAl as nonferromagnetic (NM) spacer layers, we fabricated current- perpendicular-to-plane giant magnetoresistance (CPP-GMR) pseudo spin vales. We have demonstrated a large MR output of (delta)RA > 12 m(omega)(mu)m2 with a MR ratio of DR/R=12% at room temperature from an optimally annealed Co2Mn(Ge,Ga)/Ag/Co2Mn(Ge,Ga) PSV. We also found the crystallographic orientation dependence of MR outputs for the first time and demonstrated a [001]-textured polycrystalline Heusler/Ag/Heusler CPP-GMR, which paved a new path for higher MR output of CPP-GMR devices.
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