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Interface Properties of Fe\MgO\Cu-Phthalocyanine Metal-Insulator-Organic Semiconductor Structures
이년종,배유정,김태희,Eisuke Ito,Masahiko Hara 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.12
Hybrid interface structures consisting of organic copper-phthalocyanine (CuPc) and ferromagneticmetal Fe(001) with and without a MgO(001) cover were investigated by using surface sensitivetechniques of X-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy. Asystematic study of the energy level alignment at the interfaces was carried out. For the hybridinterfaces considered here, our results indicate that the insertion of an artificially-grown ultra-thinoxide layer MgO(001) can prevent Femi level pinning and induce a rather large interface dipole,thereby resulting in remarkable CuPc Fermi level shifts when the thickness of the CuPc film is lessthan 3 nm. This study provides a better understanding of spin filtering in MgO-based organic spindevices and a new way to alter the interface electronic structure of metal\organic semiconductorhybrid systems.
Ga 극초박막의 계면특성과 초전도 물성제어에 대한 연구
이년종(Nyun Jong Lee),김태희(Tae Hee Kim) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.6
Spin polarized tunneling studies were carried out with Al-Ga bilayer as a spin detector, by Meservey-Tedrow technique. The superconductor (SC)/Insulator (I)/Ferromagnet (FM) tunnel junctions were provided by ultra high vacuum molecular beam epitaxy (UHV-MBE) technique. The analysis of interfacial properties in the Al-Ga bilayer was also carried out by Auger electron spectroscopy. It was observed that the superconducting transition temperature and energy gap were raised in comparison with that of bulk Ga and pure ultrathin Al films. Current studies clearly show how one can modify the material properties at the interface just with a few monolayers.