Affiliation:
1. University of Shanghai for Science and Technology
2. Nanjing University
Abstract
The dynamic control of magnetization by short laser pulses has recently attracted interest. The transient magnetization at the metallic magnetic interface has been investigated through second-harmonic generation and the time-resolved magneto-optical effect. However, the ultrafast light-driven magneto-optical nonlinearity in ferromagnetic heterostructures for terahertz (THz) radiation remains unclear. Here, we present THz generation from a metallic heterostructure, Pt/CoFeB/Ta, which is ascribed to an ∼6–8% contribution from the magnetization-induced optical rectification and an ∼94–92% contribution from both spin-to-charge current conversion and ultrafast demagnetization. Our results show that THz-emission spectroscopy is a powerful tool to study the picosecond-time-scale nonlinear magneto-optical effect in ferromagnetic heterostructures.
Funder
National Natural Science Foundation of China
111 Project
the Key project supported by Science and Technology Commission Shanghai Municipality
Science and Technology Commission of Shanghai Municipality
General Administration of Customs People’s Republic of China
Natural Science Foundation of Jiangsu Province
National Key Research and Development Program of China
Subject
Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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