Efficient Optical Control of Magnon Dynamics in van der Waals Ferromagnets

Yu Gong; Zhonghua Yang; Alem Teklu; Ti Xie; Noah Kern; Andrew F. May; Michael McGuire; Christian Brennan; Er Jia Guo; Narayanan Kuthirummal; John Cetin; Qian Zhang; Ming Hu; Cheng Gong

doi:10.34133/ultrafastscience.0064

Efficient Optical Control of Magnon Dynamics in van der Waals Ferromagnets

Yu Gong, Zhonghua Yang, Alem Teklu, Ti Xie, Noah Kern, Andrew F. May, Michael McGuire, Christian Brennan, Er Jia Guo, Narayanan Kuthirummal, John Cetin, Qian Zhang, Ming Hu, Cheng Gong

Correlated Electron Materials

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

1 Scopus citations

Abstract

Optical control of magnons in two-dimensional (2D) materials promises new functionalities for spintronics and magnonics in atomically thin devices. Here, we report control of magnon dynamics, using laser polarization, in a ferromagnetic van der Waals (vdW) material, Fe_3.6Co_1.4GeTe₂. The magnon amplitude, frequency, and lifetime are controlled and monitored by time-resolved pump-probe spectroscopy. We show substantial (over 25%) and continuous modulation of magnon dynamics as a function of incident laser polarization. Our results suggest that the modification of the effective demagnetization field and magnetic anisotropy by the pump laser pulses with different polarizations is due to anisotropic optical absorption. This implies that pump laser pulses modify the local spin environment, which enables the launch of magnons with tunable dynamics. Our first-principles calculations confirm the anisotropic optical absorption of different crystal orientations. Our findings suggest a new route for the development of opto-spintronic or opto-magnonic devices.

Original language	English
Article number	0064
Journal	Ultrafast Science
Volume	4
DOIs	https://doi.org/10.34133/ultrafastscience.0064
State	Published - 2024

Funding

Funding: Research reported in this publication was supported in part by the NSF and SC EPSCoR/IDeA Program under NSF Award #OIA-1655740 (GEAR CRP 20-GC02, 23-GC01) and NSF Award No. 2030128, 2110033. This work was supported in part by the US Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Visiting Faculty Program (VFP). C.G. acknowledges the grant support from the Air Force Office of Scientific Research under Award No. FA9550-22-1-0349 and National Science Foundation under Award No. DMR-2326944 and No. DMR-2340773. Z.Y. acknowledges the support from the program of Educational Department of Liaoning Province (grant no. LQGD2020008). A.F.M. and M.M. acknowledge the support (Crystal growth and characterization) from the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Y.G. acknowledges the support from Dr. Jeffrey Wragg for the manuscript organization. Funding: Research reported in this publication was supported in part by the NSF and SC EPSCoR/IDeA Program under NSF Award #OIA-1655740 (GEAR CRP 20-GC02, 23-GC01) and NSF Award No. 2030128, 2110033. This work was supported in part by the US Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Visiting Faculty Program (VFP). C.G. acknowledges the grant support from the Air Force Office of Scientific Research under Award No. FA9550-22-1-0349 and National Science Foundation under Award No. DMR-2326944 and No. DMR-2340773. Z.Y. acknowledges the support from the program of Educational Department of Liaoning Province (grant no. LQGD2020008). A.F.M. and M.M. acknowledge the support (Crystal growth and characterization) from the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Y.G. acknowledges the support from Dr. Jeffrey Wragg for the manuscript organization. Author contributions: Y.G. conceived the project and designed experiments. C.B. and J.C. conducted transient reflectivity measurements under Y.G.\u2019s supervision. M.H. and Z.Y. carried out DFT calculations. T.X. conducted 2D sample exfoliation under C.G.\u2019s supervision. A.T. and N.K. carried out AFM measurements and provided figures. A.F.M and M.M. synthesized bulk FeGeTe crystals. Q.Z., C.B. and J.C. participated in the data analysis and organization. E.J.G, N.K. and C.G. participated in the result

Funders	Funder number
Workforce Development for Teachers and Scientists
Basic Energy Sciences
Division of Materials Sciences and Engineering
U.S. Department of Energy
Office of Science
National Science Foundation	23-GC01, GEAR CRP 20-GC02, 2030128, DMR-2340773, 2110033, -1655740, DMR-2326944
Air Force Office of Scientific Research	FA9550-22-1-0349
Department of Education of Liaoning Province	LQGD2020008

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title = "Efficient Optical Control of Magnon Dynamics in van der Waals Ferromagnets",

abstract = "Optical control of magnons in two-dimensional (2D) materials promises new functionalities for spintronics and magnonics in atomically thin devices. Here, we report control of magnon dynamics, using laser polarization, in a ferromagnetic van der Waals (vdW) material, Fe3.6Co1.4GeTe2. The magnon amplitude, frequency, and lifetime are controlled and monitored by time-resolved pump-probe spectroscopy. We show substantial (over 25%) and continuous modulation of magnon dynamics as a function of incident laser polarization. Our results suggest that the modification of the effective demagnetization field and magnetic anisotropy by the pump laser pulses with different polarizations is due to anisotropic optical absorption. This implies that pump laser pulses modify the local spin environment, which enables the launch of magnons with tunable dynamics. Our first-principles calculations confirm the anisotropic optical absorption of different crystal orientations. Our findings suggest a new route for the development of opto-spintronic or opto-magnonic devices.",

author = "Yu Gong and Zhonghua Yang and Alem Teklu and Ti Xie and Noah Kern and May, {Andrew F.} and Michael McGuire and Christian Brennan and Guo, {Er Jia} and Narayanan Kuthirummal and John Cetin and Qian Zhang and Ming Hu and Cheng Gong",

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year = "2024",

doi = "10.34133/ultrafastscience.0064",

language = "English",

volume = "4",

journal = "Ultrafast Science",

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T1 - Efficient Optical Control of Magnon Dynamics in van der Waals Ferromagnets

AU - Gong, Yu

AU - Yang, Zhonghua

AU - Teklu, Alem

AU - Xie, Ti

AU - Kern, Noah

AU - May, Andrew F.

AU - McGuire, Michael

AU - Brennan, Christian

AU - Guo, Er Jia

AU - Kuthirummal, Narayanan

AU - Cetin, John

AU - Zhang, Qian

AU - Hu, Ming

AU - Gong, Cheng

PY - 2024

Y1 - 2024

N2 - Optical control of magnons in two-dimensional (2D) materials promises new functionalities for spintronics and magnonics in atomically thin devices. Here, we report control of magnon dynamics, using laser polarization, in a ferromagnetic van der Waals (vdW) material, Fe3.6Co1.4GeTe2. The magnon amplitude, frequency, and lifetime are controlled and monitored by time-resolved pump-probe spectroscopy. We show substantial (over 25%) and continuous modulation of magnon dynamics as a function of incident laser polarization. Our results suggest that the modification of the effective demagnetization field and magnetic anisotropy by the pump laser pulses with different polarizations is due to anisotropic optical absorption. This implies that pump laser pulses modify the local spin environment, which enables the launch of magnons with tunable dynamics. Our first-principles calculations confirm the anisotropic optical absorption of different crystal orientations. Our findings suggest a new route for the development of opto-spintronic or opto-magnonic devices.

AB - Optical control of magnons in two-dimensional (2D) materials promises new functionalities for spintronics and magnonics in atomically thin devices. Here, we report control of magnon dynamics, using laser polarization, in a ferromagnetic van der Waals (vdW) material, Fe3.6Co1.4GeTe2. The magnon amplitude, frequency, and lifetime are controlled and monitored by time-resolved pump-probe spectroscopy. We show substantial (over 25%) and continuous modulation of magnon dynamics as a function of incident laser polarization. Our results suggest that the modification of the effective demagnetization field and magnetic anisotropy by the pump laser pulses with different polarizations is due to anisotropic optical absorption. This implies that pump laser pulses modify the local spin environment, which enables the launch of magnons with tunable dynamics. Our first-principles calculations confirm the anisotropic optical absorption of different crystal orientations. Our findings suggest a new route for the development of opto-spintronic or opto-magnonic devices.

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SN - 2097-0331

VL - 4

JO - Ultrafast Science

JF - Ultrafast Science

M1 - 0064

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Efficient Optical Control of Magnon Dynamics in van der Waals Ferromagnets

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