Exploring the Structures, Electronic and Magnetic Properties of Low Dimensional Materials

• Main Authors: Yao-Jui Chan, 詹曜瑞
• Other Authors: Chien-Cheng Kuo
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/xcxz63

博士 === 國立中山大學 === 物理學系研究所 === 107 === The progress of current researches in the condense matter physics is driven by the discovery of the novel two dimensional materials because these materials not only reveal exotically intrinsic properties but also exist unexplored proper- ties in their hetertostructures. Therefore, it is of a great desire to study their surface and interface properties. The aims in this thesis focus on the structure, electronic, and magnetic properties of the metal/graphene heterostructure and the ultrathin ferromagnetic heterostructure on the surface and near the inter- face. The researches is conducted by using surface and interface sensitive tools the such as the XAS, XMCD and XPEEM. In first work, I focus on the interface magnetism of Co/graphene. With the help of dipolar interaction, the magneti- zation of Co nanoparticles/graphene is successfully stabilized at room tempera- ture. Besides, there exists the spin polarized state at the interface of Co nanoparti- cles/graphene. The second work is relative to the study on the interface structure and electronic properties of metal/graphene. By using XAS, the buried interface structure is unveiled the before and after the heat treatment. Final work is con- centrated on the magnetic anisotorpy and domain structures of Fe/Co coupled bilayers. The thickness dependent magnetic phase diagram is directly mapped out by the domain images. The bubble-domains are also discovered in the in- plane transition region.