Investigations on the magnetic properties of O/CoO /Ir(111) ultrathin films

• Main Authors: Chi-wei Lee, 李奇暐
• Other Authors: J.S. Tsay
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/77838723215078869966

碩士 === 國立中正大學 === 物理所 === 94 === Magnetic properties and compositions of O/CoO/Ir(111) ultrathin films have studied by using surface magneto-optic Kerr effect (SMOKE), Auger electron spectroscopy (AES) and depth profiling techniques. By way of post exposure to oxygen of Co films, oxygen shows layered distribution in the O/Co/Ir(111) system where most oxygen distributes at surface layers from the depth profiling measurements. Post annealing of the O/Co/Ir(111) structure causes the formation of CoO layer and adsorbed oxygen layer on the top. SMOKE measurements at low-temperatures show that the CoO layer exhibits high coercivity. Exchange coupling between CoO layers and subsequently deposited Co was revealed after field-cooling process. The coupling length is dependent on the thickness of CoO layer. From systematical investigations, one can obtain the optimal condition for the coupling between ferromagnetic and antiferromagnetic layers.