| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
We have made layered films of superconducting NbN and half-metallic Heusler alloy Co2Fe0.4Mn0.6Si (CFMS). The fabrication conditions and device structures of half-metallic Josephson devices were optimized by extracting the physical parameters from transport measurements under magnetic fields. When a half-metallic layer was deposited on a superconducting layer, the coherence length and the diffusive coefficient increased, while the superconducting transition temperature and the critical field decreased. Based on the obtained results, we have fabricated NbN/CFMS/NbN structured devices and evaluated the properties of the half-metallic Josephson devices.
In addition, we have developed the epitaxial contact Andreev reflection (ECAR) spectroscopy which can decide an intrinsic spin polarization. We succeeded in determining the spin polarization of Heusler alloy Co2FeSi.
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