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Efficient ultrafast field-driven spin current generation for spintronic terahertz frequency conversion.

Igor Ilyakov¹, Arne Brataas², Thales V A G de Oliveira³

¹Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328, Dresden, Germany. i.ilyakov@hzdr.de.

Nature Communications

|November 3, 2023

Summary

Terahertz (THz) radiation efficiently drives spin currents in heterostructures via ultrafast spin Seebeck effect. This breakthrough offers a new spintronic basis for THz frequency mixing and rectifying components.

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Area of Science:

Spintronics
Condensed Matter Physics
Optics

Background:

Efficient spin current generation and control are crucial for next-generation high-speed electronics.
Terahertz (THz) radiation offers potential for ultrafast manipulation of spin dynamics.

Purpose of the Study:

To demonstrate efficient coherent angular momentum transfer using THz light in ferromagnet/heavy-metal heterostructures.
To explore the underlying mechanisms and potential applications of THz-driven spin currents.

Main Methods:

Utilized nanometer-thick ferromagnet/heavy-metal heterostructures.
Investigated non-resonant THz light-induced phenomena without external magnetic fields or cryogenics.
Analyzed THz-induced temperature imbalance and electron-phonon relaxation dynamics.

Main Results:

Achieved efficient coherent angular momentum transfer driven by THz light.
Demonstrated an efficiency over an order of magnitude higher than THz-induced spin pumping in MnF2.
Observed THz second harmonic generation and THz optical rectification due to the ultrafast spin Seebeck effect.

Conclusions:

THz light can efficiently generate and control spin currents in heterostructures.
The ultrafast spin Seebeck effect is the primary mechanism, driven by THz-induced temperature gradients.
This work provides a spintronic foundation for THz frequency mixing and rectifying devices.