| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Magnetic materials with high perpendicular magneto-crystalline anisotropy (MCA) have great advantage in the reduction of the switching current . Among the magnetic materials with perpendicular MCA, D022-Mn3Ga alloys have attractive features, which are high perpendicular MCA (Ku>1.0 MJ/m3), the high Curie temperature (TC=730K) and the small saturation magnetization (MS=0.25μB/atom) due to the antiferromagnetic behavior. We investigated spin dependent transport properties of magnetic tunnel junctions (MTJs) with Mn3Ga or Mn3Ge using the first-principles calculations. We found that tunneling magntoresistance (TMR) ratios of Mn3Ga/MgO MTJs is very small, which is about 40% for MnGa termination. On the other hand, we obtained over 4000% TMR ratios both for MnMn and MnGe terminations of Mn3Ge-based MTJs due to the half-metallic electronic structure on the state. We concluded that Mn3Ge is a promising material providing large TMR effects as well as strong perpendicular magnetic anisotropy.
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