[11a-S421-1~12] 3.9 Terahertz technologies

▲ [11a-S421-10] Spintronic CW THz Generation Using an Optimized Fe/Pt Metallic Bilayer

〇(P)Valynn Katrine Magusara¹, Fumiyoshi Kuwashima², Miezel Talara¹, Garik Torosyan³, Hideaki Kitahara¹, Sascha Keller⁴, Laura Scheuer⁴, Johannes L'huillier³, Evangelos Th. Papaioannou⁴, Rene Beigang⁴, Masahiko Tani¹ (1.Univ. of Fukui, 2.Fukui Univ. of Tech., 3.Photonic Center Kaiserslautern, 4.Univ. of Kaiserslautern)

Keywords:THz spintronics, THz generation, continuous wave THz source

Metallic spintronic heterostructures, which consist of ferromagnetic (FM) and non-ferromagnetic (NM) thin films, are now an emerging ideal class of broadband terahertz (THz) sources. They exhibit a distinct THz generation mechanism that results from the efficient conversion of optically driven spin currents from an in-plane magnetized FM layer into charge currents in an adjacent NM layer. By using an optimized spintronic bilayer structure (2-nm Fe and 3-nm Pt grown on 500-μm MgO), it has been demonstrated that metallic spintronic THz emitters are convenient sources of pulsed THz radiation at different wavelengths and average optical excitation power levels. For this work, spintronic generation of continuous THz waves (cw THz) was investigated by utilizing the same optimized Fe/Pt bilayer as the THz emitter in a cw THz generation-and-detection setup. Our results remarkably exhibit experimental proof of spintronic cw THz generation using metallic spintronic heterostructures.