Abstract
In this thesis, we study the interfacial properties of Co/Pentacene/Co/Cr/Si(100) multilayer as a vertical pseudo spin-valve structure. We probe the electronic structure, molecular orientation and magnetic characteristic at the interface of Pentacene/Co and Co/Pentacene by utilizing X-ray photoemission spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), polarized near-edge X-ray absorption fine structure (NEXAFS) and magneto-optical Kerr effect (MOKE) The interface of Pentacene/Co might be stable chemically with a dipole layer and has a hole injection barrier of 0.96 eV. Pentacene molecules prefer to lie flatly on Co surface at low coverage(about 1~4 □). With thickness increasing(at least 8 □), the packing orientation turns to tilt up on surface. When the Pentacene(1 □) is deposited on Co(34□), the coercivity becomes a little small. The result of the study of Co layer on Pentacene show that：Co diffuses into Pentacene. When third layer of Co is deposited on Pentacene. Then, Co interacts with Pentacene leading to a formation of chemical bond which destroy the well-order orientation of Pentacene. The resulting Coblat Carbide has a small coercivity (about 11~13 Oe). In summary, these two interfacial properties for Co/Pentacene and Pentacene/Co are different not only in structure but also in electronic properties.