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Ultrafast Spin Dynamics of Pt/Gd 19 (Co 0.8 Fe 0.2) 81 /Ta Heterostructure Investigated by Double-Pump Terahertz Emission Spectroscopy.

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Title: Ultrafast Spin Dynamics of Pt/Gd 19 (Co 0.8 Fe 0.2) 81 /Ta Heterostructure Investigated by Double-Pump Terahertz Emission Spectroscopy.
Authors: Li, Changwei1 (AUTHOR), Lu, Bo1,2 (AUTHOR), Yu, Nuoxi1 (AUTHOR), Li, Zhangshun1,2 (AUTHOR), Xu, Haoran1 (AUTHOR), Zhang, Huiping1,2 (AUTHOR) hpzhang@usst.edu.cn, Jin, Zuanming1,2 (AUTHOR)
Source: Nanomaterials (2079-4991). Apr2026, Vol. 16 Issue 7, p390. 10p.
Subjects: Demagnetization, Heterostructures, Magnetic relaxation, Spin-spin interactions, Terahertz technology, Terahertz spectroscopy, Electron-phonon interactions, Spintronics
Abstract: Ultrafast spin dynamics is a core research focus for advancing ultrafast spintronic devices, yet its accurate quantitative probing remains a challenge with conventional time-resolved techniques. Herein, we employ double-pump optical pump–terahertz emission spectroscopy (OPTE) to investigate the ultrafast spin dynamics of a Pt/Gd19(Co0.8Fe0.2)81/Ta ferrimagnetic rare-earth–transition-metal heterostructure. Experimental measurements resolve a single-step ultrafast demagnetization process with a characteristic time of ~0.42 ± 0.02 ps, followed by two-stage magnetic recovery involving a fast relaxation and a slow relaxation process. The fast and slow recovery time constants show a distinct positive dependence on the control pump fluence, increasing from 2.49 ± 0.11 ps to 3.28 ± 0.03 ps and 57.36 ± 11.28 ps to 164.96 ± 1.61 ps, respectively, as the pump fluence rises from 0.80 to 1.19 mJ/cm2. The ~0.42 ps demagnetization timescale is consistent with that of 3d transition metals, indicating the transient magnetic response of the low-Gd-concentration heterostructure is dominated by the CoFe sublattice. Our findings validate that OPTE is an effective approach for the quantitative characterization of electron–lattice–spin coupling processes in spin-based heterostructures and provide critical experimental insights for controllable manipulation of ultrafast spin dynamics, laying a foundation for the design of ultrafast terahertz spintronic devices. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Ultrafast Spin Dynamics of Pt/Gd 19 (Co 0.8 Fe 0.2) 81 /Ta Heterostructure Investigated by Double-Pump Terahertz Emission Spectroscopy.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Changwei%22">Li, Changwei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+Bo%22">Lu, Bo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Nuoxi%22">Yu, Nuoxi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Zhangshun%22">Li, Zhangshun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xu%2C+Haoran%22">Xu, Haoran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Huiping%22">Zhang, Huiping</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> hpzhang@usst.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Jin%2C+Zuanming%22">Jin, Zuanming</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Apr2026, Vol. 16 Issue 7, p390. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Demagnetization%22">Demagnetization</searchLink><br /><searchLink fieldCode="DE" term="%22Heterostructures%22">Heterostructures</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+relaxation%22">Magnetic relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Spin-spin+interactions%22">Spin-spin interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Terahertz+technology%22">Terahertz technology</searchLink><br /><searchLink fieldCode="DE" term="%22Terahertz+spectroscopy%22">Terahertz spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Electron-phonon+interactions%22">Electron-phonon interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Spintronics%22">Spintronics</searchLink>
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  Label: Abstract
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  Data: Ultrafast spin dynamics is a core research focus for advancing ultrafast spintronic devices, yet its accurate quantitative probing remains a challenge with conventional time-resolved techniques. Herein, we employ double-pump optical pump–terahertz emission spectroscopy (OPTE) to investigate the ultrafast spin dynamics of a Pt/Gd19(Co0.8Fe0.2)81/Ta ferrimagnetic rare-earth–transition-metal heterostructure. Experimental measurements resolve a single-step ultrafast demagnetization process with a characteristic time of ~0.42 ± 0.02 ps, followed by two-stage magnetic recovery involving a fast relaxation and a slow relaxation process. The fast and slow recovery time constants show a distinct positive dependence on the control pump fluence, increasing from 2.49 ± 0.11 ps to 3.28 ± 0.03 ps and 57.36 ± 11.28 ps to 164.96 ± 1.61 ps, respectively, as the pump fluence rises from 0.80 to 1.19 mJ/cm2. The ~0.42 ps demagnetization timescale is consistent with that of 3d transition metals, indicating the transient magnetic response of the low-Gd-concentration heterostructure is dominated by the CoFe sublattice. Our findings validate that OPTE is an effective approach for the quantitative characterization of electron–lattice–spin coupling processes in spin-based heterostructures and provide critical experimental insights for controllable manipulation of ultrafast spin dynamics, laying a foundation for the design of ultrafast terahertz spintronic devices. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        PageCount: 10
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      – SubjectFull: Demagnetization
        Type: general
      – SubjectFull: Heterostructures
        Type: general
      – SubjectFull: Magnetic relaxation
        Type: general
      – SubjectFull: Spin-spin interactions
        Type: general
      – SubjectFull: Terahertz technology
        Type: general
      – SubjectFull: Terahertz spectroscopy
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      – SubjectFull: Electron-phonon interactions
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      – SubjectFull: Spintronics
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      – TitleFull: Ultrafast Spin Dynamics of Pt/Gd 19 (Co 0.8 Fe 0.2) 81 /Ta Heterostructure Investigated by Double-Pump Terahertz Emission Spectroscopy.
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            NameFull: Li, Changwei
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              Text: Apr2026
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