2017年第78回応用物理学会秋季学術講演会

講演情報

一般セッション(ポスター講演)

3 光・フォトニクス » 3.9 テラヘルツ全般

[6a-PA3-1~23] 3.9 テラヘルツ全般

3.9と4.7のコードシェアセッションあり

2017年9月6日(水) 09:30 〜 11:30 PA3 (国際センター1F)

09:30 〜 11:30

[6a-PA3-19] Terahertz Emission Based on Spin Current from Ferromagnetic Heterostructures

〇(DC)Hongsong Qiu1、Kosaku Kato1、Kazumasa Hirota1、Nobuhiko Sarukura1、Masashi Yoshimura1、Makoto Nakajima1 (1.Osaka Univ.)

キーワード:THz emission, spin current, ferromagnetic heterostructure

Modern spin-based electronics (spintronics) store and process the information via the spin degree of the freedom. The processing of spin dynamics in spintronic devices is frequently relevant to the spin currents. The femtosecond laser pulse provides a novel stimulus for exciting ultrafast spin current transient on subpicosecond timescales in metallic magnetic heterostructures. In this work, we demonstrate the terahertz (THz) emission related with spin current in ferromagnetic heterostructures which contains a ferromagnetic metal layer and a non-magnetic layer. The spin current transient is temporally probed in a contactless way on the basis of inverse spin Hall effect and electric dipole radiation, which give rise to a terahertz emission. The non-magnetic layer thickness dependence of the emission amplitude is studied. This research provides new insights in excitation and detection of spin currents in terahertz regime.