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

Lin Huang; Ji Wan Kim; Sang Hyuk Lee; Seon Dae Kim; Van Manh Tien; Kiran Prakash Shinde; Je Ho Shim; Yooleemi Shin; Hee Jun Shin; Seongheun Kim; Jaehun Park; Seung Young Park; Yeon Suk Choi; Hyun Joong Kim; Jung Il Hong; Dong Eon Kim; Dong Hyun Kim

doi:10.1063/1.5087236

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

Lin Huang, Ji Wan Kim, Sang Hyuk Lee, Seon Dae Kim, Van Manh Tien, Kiran Prakash Shinde, Je Ho Shim, Yooleemi Shin, Hee Jun Shin, Seongheun Kim, Jaehun Park, Seung Young Park, Yeon Suk Choi, Hyun Joong Kim, Jung Il Hong, Dong Eon Kim, Dong Hyun Kim

Department of Physics and Chemistry

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

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.

Original language	English
Article number	142404
Journal	Applied Physics Letters
Volume	115
Issue number	14
DOIs	https://doi.org/10.1063/1.5087236
State	Published - 30 Sep 2019

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Huang, L., Kim, J. W., Lee, S. H., Kim, S. D., Tien, V. M., Shinde, K. P., Shim, J. H., Shin, Y., Shin, H. J., Kim, S., Park, J., Park, S. Y., Choi, Y. S., Kim, H. J., Hong, J. I., Kim, D. E., & Kim, D. H. (2019). Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films. Applied Physics Letters, 115(14), Article 142404. https://doi.org/10.1063/1.5087236

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title = "Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films",

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.",

author = "Lin Huang and Kim, \{Ji Wan\} and Lee, \{Sang Hyuk\} and Kim, \{Seon Dae\} and Tien, \{Van Manh\} and Shinde, \{Kiran Prakash\} and Shim, \{Je Ho\} and Yooleemi Shin and Shin, \{Hee Jun\} and Seongheun Kim and Jaehun Park and Park, \{Seung Young\} and Choi, \{Yeon Suk\} and Kim, \{Hyun Joong\} and Hong, \{Jung Il\} and Kim, \{Dong Eon\} and Kim, \{Dong Hyun\}",

note = "Publisher Copyright: {\textcopyright} 2019 Author(s).",

year = "2019",

month = sep,

day = "30",

doi = "10.1063/1.5087236",

language = "English",

volume = "115",

journal = "Applied Physics Letters",

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T1 - Direct observation of terahertz emission from ultrafast spin dynamics in thick ferromagnetic films

AU - Huang, Lin

AU - Kim, Ji Wan

AU - Lee, Sang Hyuk

AU - Kim, Seon Dae

AU - Tien, Van Manh

AU - Shinde, Kiran Prakash

AU - Shim, Je Ho

AU - Shin, Yooleemi

AU - Shin, Hee Jun

AU - Kim, Seongheun

AU - Park, Jaehun

AU - Park, Seung Young

AU - Choi, Yeon Suk

AU - Kim, Hyun Joong

AU - Hong, Jung Il

AU - Kim, Dong Eon

AU - Kim, Dong Hyun

PY - 2019/9/30

Y1 - 2019/9/30

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85073203071

U2 - 10.1063/1.5087236

DO - 10.1063/1.5087236

M3 - Article

AN - SCOPUS:85073203071

SN - 0003-6951

VL - 115

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 14

M1 - 142404

ER -

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

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