Abstract
The temperature dependence of the magnetic relaxation time τ( T) is investigated in perpendicularly magnetized, ultrathin Fe/2 monolayer Ni/W(1 1 0) films by magnetic susceptibility measurements. Complex magnetic susceptibilities χ( T)= χ′( T)+i χ″( T) were measured by the polar Kerr effect as a function of temperature T. In all cases, χ′( T) and χ″( T) have broad peaks that are not obviously related to the Curie temperature T C. An experimental relaxation time τ( T) is determined from the ratio χ″( T)/ χ′( T). The results support previous arguments that the susceptibility arises from domain-wall motion.
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