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Magnetization-induced optical rectification and inverse spin Hall effect for interfacial terahertz generation in metallic heterostructures

Yao, Zehan LU ; Fu, Huarui ; Du, Wanyi ; Huang, Yuanyuan ; Lei, Zhen ; You, Caiyin and Xu, Xinlong (2021) In Physical Review B 103(20).
Abstract

Metallic heterostructure as promising terahertz (THz) spintronic emitters has promoted the development of both spintronics and THz science. However, the underlying physics at the metallic interface, such as the nonlinear optical effect, remains unclear. Herein, we present interface magnetization induced THz generation from metallic heterostructure consisting of Heusler alloy CoFeMnSi (CFMS) and Pd thin films. THz generation is ascribed to 35% contribution from the magnetization-induced optical rectification (MOR) and 65% contribution from inverse spin Hall effect (ISHE) based on the pump polarization and sample azimuthal angle dependent measurement. Furthermore, the contribution ratio of the MOR decreases to 12% via lowering the CFMS... (More)

Metallic heterostructure as promising terahertz (THz) spintronic emitters has promoted the development of both spintronics and THz science. However, the underlying physics at the metallic interface, such as the nonlinear optical effect, remains unclear. Herein, we present interface magnetization induced THz generation from metallic heterostructure consisting of Heusler alloy CoFeMnSi (CFMS) and Pd thin films. THz generation is ascribed to 35% contribution from the magnetization-induced optical rectification (MOR) and 65% contribution from inverse spin Hall effect (ISHE) based on the pump polarization and sample azimuthal angle dependent measurement. Furthermore, the contribution ratio of the MOR decreases to 12% via lowering the CFMS grown temperature, which is due to the reduced crystalline quality and possible metal to semiconductor transformation in CFMS. Our results not only clarify MOR and ISHE in metallic heterostructure for the scientific field, but they also benefit THz source optimization for the technology field.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
103
issue
20
article number
L201404
publisher
American Physical Society
external identifiers
  • scopus:85107078890
ISSN
2469-9950
DOI
10.1103/PhysRevB.103.L201404
language
English
LU publication?
yes
id
b16e4166-3cf7-48e7-95f8-5834dfb09537
date added to LUP
2022-03-03 08:22:44
date last changed
2023-11-21 03:23:04
@article{b16e4166-3cf7-48e7-95f8-5834dfb09537,
  abstract     = {{<p>Metallic heterostructure as promising terahertz (THz) spintronic emitters has promoted the development of both spintronics and THz science. However, the underlying physics at the metallic interface, such as the nonlinear optical effect, remains unclear. Herein, we present interface magnetization induced THz generation from metallic heterostructure consisting of Heusler alloy CoFeMnSi (CFMS) and Pd thin films. THz generation is ascribed to 35% contribution from the magnetization-induced optical rectification (MOR) and 65% contribution from inverse spin Hall effect (ISHE) based on the pump polarization and sample azimuthal angle dependent measurement. Furthermore, the contribution ratio of the MOR decreases to 12% via lowering the CFMS grown temperature, which is due to the reduced crystalline quality and possible metal to semiconductor transformation in CFMS. Our results not only clarify MOR and ISHE in metallic heterostructure for the scientific field, but they also benefit THz source optimization for the technology field.</p>}},
  author       = {{Yao, Zehan and Fu, Huarui and Du, Wanyi and Huang, Yuanyuan and Lei, Zhen and You, Caiyin and Xu, Xinlong}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{20}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Magnetization-induced optical rectification and inverse spin Hall effect for interfacial terahertz generation in metallic heterostructures}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.103.L201404}},
  doi          = {{10.1103/PhysRevB.103.L201404}},
  volume       = {{103}},
  year         = {{2021}},
}