Terahertz Spin Current Dynamics in Antiferromagnetic Hematite.

ABSTRACT: An important vision of modern magnetic research is to use antiferromagnets (AFMs) as controllable and active ultrafast components in spintronic devices. Hematite (α-Fe₂ O₃ ) is a promising model material in this respect because its pronounced Dzyaloshinskii-Moriya interaction leads to the coexistence of antiferromagnetism and weak ferromagnetism. Here, femtosecond laser pulses are used to drive terahertz (THz) spin currents from α-Fe₂ O₃ into an adjacent Pt layer. Two contributions to the generation of the spin current with distinctly different dynamics are found: the impulsive stimulated Raman scatting that relies on the AFM order and the ultrafast spin Seebeck effect that relies on the net magnetization. The total THz spin current dynamics can

SUBMITTER: Qiu H 

PROVIDER: S-EPMC10288251 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature