Figure 3. Magnetic analysis on the magnetic patterned Co/Pt MLs.
(a) ac-demagnetized MFM images of the uncapped (upper row) and the Ag-capped samples (lower row) at the as-deposited state, and after 250 oC, and 350 oC RTA. (b) ΔM curves with different Tann and capping conditions. (c) Tann dependence of the ac-demagnetized domain size (Ddomain) and activation volume (Vact). (d) Dependence between Ddomain and Vact. (e) Correlation between the reciprocal of activation volume (1/Vact) and nucleation field (Hn) of samples with different Tann. The red and blue arrows indicate the different amount of activation volume change from the as-deposited to the 350 oC annealed for uncapped and Ag-capped cases, respectively.