Magnetization dynamics in optically excited nanostructured nickel films
Georg M. M\"uller, Gerrit Eilers, Zhao Wang, Malte Scherff, Ran Ji,, Kornelius Nielsch, Markus M\"unzenberg
TL;DR
This study investigates how nanostructuring affects the ultrafast and GHz magnetization dynamics in nickel films, revealing no nanosize effect on femtosecond timescales but identifying magnetic modes in the GHz regime and insights into dipole interactions.
Contribution
It provides new understanding of nanosize effects on magnetization dynamics and the role of dipole interactions in nanostructured nickel films.
Findings
No nanosize effect on femtosecond timescale
Identification of magnetic modes in GHz regime
Insight into dipole interactions based on thickness dependence
Abstract
In this work, Laser-induced magnetization dynamics of nanostructured nickel films is investigated. The influence of the nanosize is discussed considering the time-scale of hundreds of femtoseconds as well as the GHz regime. While no nanosize effect is observed on the short time-scale, the excited magnetic mode in the GHz regime can be identified by comparison with micromagnetic simulations. The thickness dependence reveals insight on the dipole interaction between single nickel structures. Also, transient reflectivity changes are discussed.
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