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Anh Tuan, Duong,Shin, Yooleemi,Phan, The-Long,Viet Cuong, Tran,Cho, Sunglae American Institute of Physics 2014 Journal of Applied Physics Vol.115 No.17
<P>The Fe1-xGax thin films (x = 0.4, 0.5) have been grown on GaSb(100) substrate using molecular beam epitaxy. An epitaxial film with bcc alpha-Fe crystal structure (A2) is observed in Fe0.6Ga0.4 film, while an impure Fe3Ga phase with DO3 structure is appeared in Fe0.5Ga0.5 film. The saturated magnetizations at room temperature are observed to be 570 emu/cm(3) and 180emu/cm(3) and the coercivities to be 170 and 364Oe for Fe0.6Ga0.4 and Fe0.5Ga0.5, respectively. A hysteresis trend in Hall resistance vs. magnetic field is observed for Fe0.5Ga0.5 film. However, there is a weak hysteresis noticed in Fe0.4Ga0.6 thin film. (C) 2014 AIP Publishing LLC.</P>
Structure and Magnetic Properties of Cu-doped Bi2Te3 and Sb2Te3 Single Crystals
Duong Anh Tuan,Jeongyong Choi,신유리미,조성래,박현민,김원동,황찬용,Dang Duc Dung 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10
We report on the structure and magnetic properties of Bi<sub>1.985</sub>Cu<sub>0.015</sub>Te<sub>3</sub> and Sb<sub>1.988</sub>Cu<sub>0.012</sub>Te<sub>3</sub> single crystals prepared by the temperature gradient solidification method. The crystals structure was rhombohedral and the lattice constants decreased with the addition of Cu. The hole carrier conduction was observed in Hall effect and thermopower measurements. The carrier densities and thermopowers at 300 K were 1.538 × 10<sup>20</sup> cm<sup>-3</sup>/ 218.5 μV/K and 1.132 × 10<sup>21</sup> cm<sup>-3</sup>/36.8 μV/K for Bi<sub>1.985</sub>Cu<sub>0.015</sub>Te<sub>3</sub> and Sb<sub>1.988</sub>Cu<sub>0.012</sub>Te<sub>3</sub>, respectively. We could observe a strong diamagnetism with weak ferromagnetic hysteresis, indicating a mixture of non-magnetic and ferromagnetic ordering between Cu-ions in Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB>.