Presentation Information
[10p-PA3-34]Self-induced spintronic terahertz emission from ferromagnetic alloys
〇(M1)Takumi Nakazono1, Shinji Isogami2, Yuta Sasaki2, Yukiko Takahashi2, Takuya Satoh1, Kihiro Yamada1 (1.Science Tokyo, 2.NIMS)
Keywords:
terahertz radiation,ANE,AHE
Conventional spintronic terahertz (THz) emitters rely on the inverse spin Hall effect. However, ferromagnetic metals inherently possess anomalous transport properties generating orthogonal electric currents. We hypothesized THz emission should arise directly from these properties. We investigated THz emission from Fe and FePt films. 12-nm-thick Fe0.5Pt0.5 films were deposited on MgO(110) at 150°C and 400°C. Fe and Fe0.5Pt0.5 films on glass were used for comparison. Electro-optic sampling showed Fe films produced no meaningful THz signal, whereas FePt films exhibited pronounced signals. This indicates FePt THz emission is driven by electric-dipole radiation from ultrafast charge currents via anomalous transport, enhanced by strong spin-orbit coupling from Pt alloying.