Abstract
Permalloy (iron dissolved in nickel, in about a 1:4 ratio) is an important material for magnetic recording, due to its negligible magnetostriction and relatively low damping. This study of ultrafast magnetization dynamics investigates the correlation between phenomena occurring on time scales from femtoseconds to nanoseconds, following irradiation of a permalloy film by femtosecond laser pulses. The intrinsic Gilbert damping experiences a transient change with varying pump fluence, due to the rising ratio of system temperature to Curie temperature. The insight from this work is valuable for developing several varieties of magnetic data-storage technology.
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