Terahertz spin-current dynamics in ferromagnet/heavy-metal stacks are unchanged when pump photon energy is varied from 1.5 to 3 eV, indicating ultrafast electron heating, not hot-electron injection, dominates.
Magnon-mediated terahertz spin transport in metallic Gd|Pt stacks
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abstract
We study femtosecond spin transport in a Gd|Pt stack induced by a laser pulse. Remarkably, the dynamics of the spin current from Gd to Pt suggests that its dominant driving force is the ultrafast spin Seebeck effect. As the contribution of a transient spin voltage in the metal Gd is minor, Gd acts akin a magnetic insulator here. This view is supported by time- and spin-resolved photoemission, which indicates that a buildup of spin voltage is suppressed by exchange scattering, leading to similar amplitudes and relaxation rates of hot majority- and minority-spin electron populations.
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Ultrafast electron heating as the dominant driving force of photoinduced terahertz spin currents
Terahertz spin-current dynamics in ferromagnet/heavy-metal stacks are unchanged when pump photon energy is varied from 1.5 to 3 eV, indicating ultrafast electron heating, not hot-electron injection, dominates.