Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Terahertz Spintronics II
MA 36.2: Vortrag
Donnerstag, 21. März 2024, 09:45–10:00, EB 202
Advancing the Efficiency of Spintronic Terahertz Frequency Conversion — •Hatice Nur Koyun1, Ruslan Salikhov1, Ciaran Fowley1, Jürgen Lindner1, Stephan Winnerl1, Artur Erbe1,2, Jürgen Faßbender1,2, Manfred Helm1,2, and Sergey Kovalev1,3 — 1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Technische Universität Dresden, 01062 Dresden, Germany — 3Technische Universität Dortmund, 44227, Dortmund, Germany
Terahertz (THz) spintronics, operating on picosecond timescales, involves the generation and control of non equilibrium electron spin states within the THz frequency regime. Recent studies have shown that THz light can efficiently drive coherent spin currents in nanometer-thick ferromagnet (FM)/heavy-metal (HM) heterostructures, primarily due to demagnetization process of FM and the ultrafast spin Seebeck effect. Owing to the fact that the electron-phonon relaxation time is comparable (or smaller) to the period of a THz wave, the induced spin current from each half cycle of the THz wave results in THz second harmonic generation (TSHG) and THz optical rectification. In this study, we explore the potential of utilizing subwavelength-sized gold periodic arrays with a grating period smaller than the THz wavelength to enhance local spin currents, thereby improving the efficiency of THz frequency conversion.
Keywords: Terahertz Second Harmonic Generation; Efficiency; Spin Current; Ferromagnet/Heavy Metal Heterostructure