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TT: Fachverband Tiefe Temperaturen

TT 60: Spintronics (other effects) (joint session MA/TT)

TT 60.6: Vortrag

Mittwoch, 11. März 2026, 16:45–17:00, POT/0112

Spintronic THz Frequency Conversion Mediated by Ferromagnetic/Oxide Interfaces — •Kang Jin¹, Ruslan Salikhov¹, Stefan Kober², Igor Ilyakov¹, Jan-Christoph Deinert¹, Aleksandra Lindner¹, Jürgen Fassbender^1,3, Sebastian F. Maehrlein^1,3, Zhe Wang², and Jürgen Lindner¹ — ¹HZDR — ²TU Dortmund — ³TU Dresden

Frequency conversion is a key nonlinear phenomenon for communication and data processing technologies. Exploring this phenomenon at terahertz (THz) frequencies is of particular interest, as the high carrier frequency enables faster data transfer and higher operational speeds. Previous experiments have revealed that THz frequency conversion could serve as a distinctive probe for THz-light-induced ultrafast spin-transfer currents (STCs) at Ferromagnetic (FM)/Non-Magnetic (NM) interfaces. Building on these findings, we report THz frequency conversion using cost-effective NM materials (such as SiO2 and Al2O3 films) and demonstrate their origin from the interfacial inverse Rashba-Edelstein effect. We compare conversion efficiencies and characteristics of different samples, revealing that FM interfaces, featuring off-stoichiometric SixOy and AlxOy, achieve conversion efficiencies comparable to heavy metal capping layers (i.e. Ta). The deposition sequence and the oxidation level of the samples were found to critically influence the sign of the spin-charge conversion. The observed THz second harmonic generation represents a spintronic foundation for developing THz frequency mixers and rectifying components.

Keywords: Terahertz frequency conversion; Inverse Rashba-Edelstein effect; Ultrafast spintronics