[9p-PB1-1~80] 10 Spintronics and Magnetics (Poster)

▲ [9p-PB1-34] Excitation Wavelength and Pump Power Dependence of Terahertz Emission of Fe/Pt Spintronic Bilayer Structure

〇(D)Miezel Legurpa Talara¹, Valynn Katrine Mag-usara¹, Yoshinori Oda¹, Hideaki Kitahara¹, Jessica Afalla¹, Garik Torosyan^2,3, Sascha Keller^3,4, Laura Scheuer^3,4, Johannes Lhuillier^2,3, Rene Beigang^3,4, Evangelos Th Papaioannou^3,4, Masahiko Tani¹ (1.Research Center for Development of Far-Infrared Region, Univ. of Fukui, Japan, 2.Photonic Center Kaiserslautern, 3.Univ. of Kaiserslautern, Research Center OPTIMAS, 4.Univ. of Kaiserslautern, Department of Physics)

Keywords:terahertz spintronics, femtosecond lasers

Spintronic heterostructures consisting of layers of ferromagnetic (FM) and nonmagnetic (NM) metals, are promising THz sources due to their considerable advantages over other conventional THz sources. Most of the studies on the THz emission of spintronic heterostructures used 800-nm and 1.55-μm as the excitation wavelengths of the laser pulses. In this paper, excitation wavelengths of 400-nm and 800-nm were used to pump the Fe/Pt spintronic heterostructure. THz-Time Domain Emission Spectroscopy (THz-TDES) measurements of the Fe/Pt spintronic bilayer structure pumped using 400-nm and 800-nm excitation wavelengths showed comparable THz amplitude. Also, THz-TDES measurements of the bilayer structure subjected to variable pump power showed the emitted THz waves to be slowly approaching saturation with increasing injection power.