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Accessing Ultrafast Spin-Transport Dynamics in Copper Using Broadband Terahertz Spectroscopy.

Jiří Jechumtál¹, Reza Rouzegar^2,3, Oliver Gueckstock^2,3

¹Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic.

Physical Review Letters

|June 15, 2024

Summary

Ultrafast electron spin transport in copper layers shows ballisticlike propagation near Fermi velocity and diffusive behavior at longer distances. This research informs the design of advanced spintronic devices.

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Area of Science:

Condensed matter physics
Materials science
Spintronics

Background:

Understanding electron spin transport dynamics is crucial for developing next-generation electronic devices.
Nanometer-thick metallic layers present unique challenges and opportunities for spin transport phenomena.

Purpose of the Study:

To investigate the spatiotemporal dynamics of ultrafast electron spin transport in copper.
To determine the transport regime (ballistic vs. diffusive) in nanometer-thick copper films.

Main Methods:

Utilized ultrabroadband terahertz emission spectroscopy.
Analyzed temporal delays, broadening, and attenuation of spin-current pulses.

Main Results:

Observed ballisticlike propagation of the spin-current pulse peak, approaching the Fermi velocity.
Identified significant velocity dispersion and diffusive features.
Determined the diffusion-dominated transport regime for distances greater than 2 nm using frequency-dependent Fick's law.

Conclusions:

Electron spin transport in nanometer-thick copper exhibits both ballistic and diffusive characteristics.
The findings provide critical insights for designing efficient broadband spintronic devices.