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Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films

Title
Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films
Authors
Huang, LinKim, Ji-WanLee, Sang-HyukKim, Seon-DaeTien, Van ManhShinde, Kiran PrakashShim, Je-HoShin, YooleemiShin, Hee JunKim, SeongheunPark, JaehunPark, Seung-YoungChoi, Yeon SukKim, Hyun-JoongHong, Jung-IlKim, Dong EonKim, Dong-Hyun
DGIST Authors
Hong, Jung-Il
Issue Date
2019-09
Citation
Applied Physics Letters, 115(14)
Type
Article
Article Type
Article
ISSN
0003-6951
Abstract
We have experimentally investigated the field- and fluence-dependent terahertz (THz) emission behaviors by a femtosecond optical pump in Co ferromagnetic films, together with the time-resolved magneto-optical Kerr effect measurement. The thickness of Co and Ta capping layers has been systematically varied. For thick films, THz emission behavior is found to be directly matched with the photoinduced ultrafast demagnetization and remagnetization dynamics. The angle-dependent THz emission measurement also confirms a direct relation between the THz emission and the photoinduced demagnetization/remagnetization dynamics in the case of thick films, while THz emission from the inverse spin Hall effect also plays a role in the case of thin Co films. © 2019 Author(s).
URI
http://hdl.handle.net/20.500.11750/10851
DOI
10.1063/1.5087236
Publisher
American Institute of Physics
Related Researcher
  • Author Hong, Jung-Il Spin Nanotech Laboratory
  • Research Interests Electric and Magnetic Properties of Nanostructured Materials; Spintronics
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceSpin Nanotech Laboratory1. Journal Articles


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