What question did this study set out to answer?

To determine the physical origin and dynamics of terahertz emission generated by femtosecond laser excitation in cobalt ferromagnetic films.

September 30, 2019Applied Physics Letters

Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films

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To determine the physical origin and dynamics of terahertz emission generated by femtosecond laser excitation in cobalt ferromagnetic films.
Measured field- and fluence-dependent terahertz emission alongside time-resolved magneto-optical Kerr effect dynamics under femtosecond optical pumping.
Systematically varied the thicknesses of cobalt ferromagnetic layers and tantalum capping layers, complemented by angle-dependent terahertz emission spectroscopy.
Terahertz emission waveforms in thick cobalt films directly match the temporal profile of photoinduced ultrafast demagnetization and remagnetization dynamics.
Angle-dependent measurements demonstrate that demagnetization dynamics govern emission in thick films, while the inverse spin Hall effect contributes to emission in thin films.

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Implication

Experimental study reveals direct terahertz emission from ultrafast magnetization dynamics in thick cobalt films, indicating radiation mechanisms driven by intrinsic spin dynamics.

Cite This Study

Huang et al. (2019) studied this question.

synapsesocial.com/papers/6a8b93ed0ca85c7e33def80c https://doi.org/10.1063/1.5087236

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Implication

Experimental study reveals direct terahertz emission from ultrafast magnetization dynamics in thick cobalt films, indicating radiation mechanisms driven by intrinsic spin dynamics.

Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films

Key Points

Discussion

Implication

Cite This Study

Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films

Key Points

Discussion

Implication

Cite This Study

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