[10p-PA3-1~41] 10 スピントロニクス・マグネティクス（ポスター）

[10p-PA3-34] Self-induced spintronic terahertz emission from ferromagnetic alloys

〇(M1)中苑 拓海¹、磯上 慎二²、佐々木 悠太²、高橋 有紀子²、佐藤 琢哉¹、山田 貴大¹ (1.東京科学大理物、2.物質・材料研究機構)

キーワード：

テラヘルツ放射、異常ネルンスト効果、異常ホール効果

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 Fe_0.5Pt_0.5 films were deposited on MgO(110) at 150°C and 400°C. Fe and Fe_0.5Pt_0.5 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.