Switching Field and Thermal Stability of CoPt/Ru Dot Arrays with Various Thicknesses

The switching fields and thermal stability of CoPt/Ru dot arrays with various dot thickness (5–20 nm) were experimentally investi-gated as a function of the dot diameter, , (130–300 nm). All dot arrays showed a single domain state, even after removal of an applied field equal to the remanence coercivity. The angular dependence of for the dot arrays indicated coherent rotation of the mag-netization during nucleation. We estimated the values of the “intrinsic ” remanence coercivity 0 obtained by subtracting the effect of thermal agitation on the magnetization and the stabilizing energy barrier to nucleatio