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Accessing Ultrafast Spin-Transport Dynamics in Copper Using Broadband Terahertz Spectroscopy
Jiří Jechumtál1, Reza Rouzegar2,3, Oliver Gueckstock2,3
1Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic.
Abstract:
We study the spatiotemporal dynamics of ultrafast electron spin transport across nanometer-thick copper layers using ultrabroadband terahertz emission spectroscopy. Our analysis of temporal delays, broadening, and attenuation of the spin-current pulse reveals ballisticlike propagation of the pulse peak, approaching the Fermi velocity, and diffusive features including a significant velocity dispersion. A comparison to the frequency-dependent Fick's law identifies the diffusion-dominated transport regime for distances >2 nm. These findings lay the groundwork for designing future broadband spintronic devices.
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