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

被引：25

作者：

Huang, Lin ^{[1
]}

Kim, Ji-Wan ^{[2
,3
,4
,5
]}

Lee, Sang-Hyuk ^{[1
,6
]}

Kim, Seon-Dae ^{[1
]}

Tien, Van Manh ^{[1
]}

Shinde, Kiran Prakash ^{[1
]}

Shim, Je-Ho ^{[3
,4
,5
]}

Shin, Yooleemi ^{[2
,3
,4
,5
]}

Shin, Hee Jun ^{[7
]}

Kim, Seongheun ^{[7
]}

Park, Jaehun ^{[7
]}

Park, Seung-Young ^{[8
]}

Choi, Yeon Suk ^{[8
]}

Kim, Hyun-Joong ^{[9
]}

Hong, Jung-Il ^{[9
]}

Kim, Dong Eon ^{[3
,4
,5
]}

Kim, Dong-Hyun ^{[1
]}

机构：

[1] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, South Korea

[2] Kunsan Natl Univ, Dept Phys, Kunsan 54150, South Korea

[3] POSTECH, Dept Phys, Pohang 37673, South Korea

[4] POSTECH, Ctr Attosecond Sci & Technol, Pohang 37673, South Korea

[5] Max Planck POSTECH KOREA Res Initiat, Pohang 37673, South Korea

[6] Korea Res Inst Stand & Sci, Adv Instrumentat Inst, Daejeon 34113, South Korea

[7] POSTECH, Pohang Accelerator Lab, Pohang 37673, South Korea

[8] Korea Basic Sci Inst, Spin Engn Phys Team, Daejeon 34133, South Korea

[9] Daegu Gyeongbuk Inst Sci & Technol, Dept Emerging Mat Sci, Daegu 42988, South Korea

来源：

APPLIED PHYSICS LETTERS | 2019年 / 115卷 / 14期

基金：

新加坡国家研究基金会;

关键词：

Spin Hall effect;

D O I：

10.1063/1.5087236

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：5

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