Direct Observation of Terahertz Emission from Ultrafast Spin Dynamics in Thick Ferromagnetic Films
SCIE
SCOPUS
- Title
- Direct Observation of Terahertz Emission from Ultrafast Spin Dynamics in Thick Ferromagnetic Films
- Authors
- KIM, DONG EON; Huang, L.; KIM, JI-WAN; LEE, SANG HYUK; KIM, SEON DAE; TIEN,VAN MANH; SHINDE, KIRAN PRAKASH; SHIM, JE-HO; SHIN, YOOLEEMI; SHIN, HEE JUN; KIM, Seongheun; PARK, JAEHUN; PARK, SEUNG YOUNG; CHOI, YEON SUK; KIM, HYUN JOONG; HONG, JUNG IL; KIM, DONG HYUN
- Date Issued
- 2019-10
- Publisher
- AMER INST PHYSICS
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/101112
- DOI
- 10.1063/1.5087236
- ISSN
- 0003-6951
- Article Type
- Article
- Citation
- APPLIED PHYSICS LETTERS, vol. 115, no. 14, 2019-10
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- There are no files associated with this item.
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