Activation Energy Depending on the Thickness of the Ferromagnetic Layer

We present the detailed study of activation energy Ea according to the thickness of the magnetic layer (tCo=0.7,0.8 and 1nm). The study was carried out at room temperature by means of polar magneto-optical Kerr effect magnetometry (PMOKE) using a He–Ne laser (=633nm). We found that the activation field 0Ha, the coercive field 0HC and the average activation energy Ea are weak for the sample with thickness tCo = 1 nm.