Magnetic Semiconductor corps. 2003/ 11/ 22 H. Yuasa K. Minami T. Nagatsuka J. Jogo (in USA) Dr. V. Smirnov Purpose ・GaAs基板上にCd1-xMnxGeP2薄膜の作製 (室温で強磁性を示すものとしては世界初の薄膜!!) Cd1-xMnxGeP2 (0≦x ≦1) CdGeP2 GaAs substrate MnGeP2 (x=0) (x=1) GaAs substrate GaAs substrate Cd 班 Mn 班 Sato Lab. MBE Pump C.C gauge Base pressure Substrate 3.0×10-10 Torr Flux monitor Growth temperature REED Mn:450~550℃ Screen Cd:200℃前後 TBP (Gas) Cd Mn Ge (Solid) Sato Lab. EDX (Mn) Mn Ge P 0.99 1.00 2.67 Sato Lab. EDX (Cd) Cd Ge P 0.68 1.00 2.62 Sato Lab. Intensity (cps) 1000000 ??? XRD (Mn) MnP? MnGe ? 5 2 100000 5 2 10000 5 2 1000 5 2 100 5 2 10 20 30 40 50 60 70 80 2Theta (ー) Sato Lab. Intensity (counts) XRD (Cd) 5 2 1000000 ??? 5 2 100000 5 2 10000 5 2 1000 5 2 100 5 63.5 64.0 64.5 65.0 65.5 66.0 66.5 67.0 67.5 68.0 68.5 69.0 2Theta-Omega (ー) Sato Lab. Plan ・ 組成比 ・ XRDのデータ解析 (リートベルト解析) ・ 基板の影響(InP…) ・ ラマン分光測定,TEM Sato Lab. おわり Sato Lab. Mn:Ge:P Growth Deposition temperature time 0.85:1.00:1.05 450℃ 150 min 0.81:1.00:1.11 550℃ 90 min 1.11:1.00:1.17 415℃ 180 min 0.99:1.00:1.17 500℃ 120 min 1.72:1.00:2.99 415℃ 180 min Sato Lab.
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