Abstract
A [Co 0.4 nm/Pt 1 nm]8 multilayer with weak intergranular coupling was fabricated. The magnetization states after applying various negative fields along the easy axis were observed using a magnetic force microscope to reveal magnetization reversal behavior. Measurement results showed the magnetization reversal area separated into many small spots consisting of one or more grains. These spots reversed independently and the reversed spots did not expand at the boundary but remained stable while the negative magnetic field increased. A coherent rotation was further deduced by calculating the thermal activation volume by a dynamic coercivity method.
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