Document Type

Article

Publication Date

2019

DOI

10.1063/1.5111578

Publication Title

Journal of Chemical Physics

Volume

151

Issue

12

Pages

124702 (1-6)

Abstract

As a classic ferromagnetic material, nickel has been an important research candidate used to study dynamics and interactions of electron, spin, and lattice degrees of freedom. In this study, we specifically chose a thick, 150 nm ferromagnetic nickel (111) single crystal rather than 10–20 nm thin crystals that are typically used in ultrafast studies, and we revealed both the ultrafast heating within the skin depth and the heat transfer from the surface (skin) layer to the bulk of the crystal. The lattice deformation after femtosecond laser excitation was investigated by means of 8.04 keV subpicosecond x-ray pulses, generated from a table-top laser-plasma based source. The temperature evolution of the electron, spin, and lattice was determined using a three temperature model. In addition to coherent phonon oscillations, the blast force and sonic waves, induced by the hot electron temperature gradient, were also observed by monitoring the lattice contractions during the first couple of picoseconds after laser irradiation. This study further revealed the tens of picoseconds time required for heating the hundred nanometer bulk of the Ni (111) single crystals.

Comments

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP publishing. This article appeared in Journal of Chemical Physics, Volume 151, Issue 12, 124702, and may be found at https://doi.org/10.1063/1.5111578.

Original Publication Citation

Li, R., Elsayed-Ali, H., Chen, J., Dhankhar, D., Krishnamoorthi, A., & Rentzepis, P. M. (2019). Ultrafast time-resolved structural changes of thin-film ferromagnetic metal heated with femtosecond optical pulses. Journal of Chemical Physics, 151(12), 124702. doi:10.1063/1.5111578

Available for download on Thursday, September 24, 2020

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