Sub-100 femtosecond time scale spin dynamics in epitaxial Fe3O4 thin film

Xianyang Lu; Guanqi Li; Yuting Gong; Xuezhong Ruan; Yu Yan; Yao Li; Liang He; Jun Du; Vlado K. Lazarov; Jing Wu; Rong Zhang; Yongbing Xu

doi:10.1016/j.apsusc.2021.151456

Sub-100 femtosecond time scale spin dynamics in epitaxial Fe₃O₄ thin film

Xianyang Lu, Guanqi Li, Yuting Gong, Xuezhong Ruan, Yu Yan, Yao Li, Liang He, Jun Du, Vlado K. Lazarov, Jing Wu^*, Rong Zhang, Yongbing Xu

^*Corresponding author for this work

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

Abstract

We have investigated the ultrafast laser-induced magnetization and reflectivity dynamics in the Fe₃O₄ thin film using all-optical pump–probe measurements. The high-quality of our sample is verified by the temperature-dependent static magnetic properties, showing a clear Verwey transition. Although the Fe₃O₄ is predicted to be a half-metal, the demagnetization process upon laser incident shows a transition-metal-like behavior. The demagnetization characteristic time has been found to be in sub-100 fs (fs) time scale, suggesting the dominant interaction of hole spin-flip processes. The spin relaxation process has been found to be around 600 fs, which is attributed to the electron–phonon coupling in accordance to the observed two electron–phonon coupling modes in reflectivity dynamics. Our results provide new insight into the ultrafast laser-induced spin dynamics in half-metallic ferrimagnet.

Original language	English
Article number	151456
Journal	APPLIED SURFACE SCIENCE
Volume	572
Early online date	30 Sept 2021
DOIs	https://doi.org/10.1016/j.apsusc.2021.151456
Publication status	Published - 15 Jan 2022

Bibliographical note

Funding Information:
This work is supported by National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant No. 61427812, 11774160, 51971109, 51871236, 61805116, and 51771053), the Natural Science Foundation of Jiangsu Province of China (No. BK20200307, BK20192006, and BK20180056), the Fundamental Research Funds for the Central Universities (Grant No. 021014380113).

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

Epitaxial FeO film
Half-metal
TR-MOKE
Ultrafast demagnetization

Access to Document

10.1016/j.apsusc.2021.151456

Cite this

@article{49039a151fb14c5ab6378d85a685ee59,

title = "Sub-100 femtosecond time scale spin dynamics in epitaxial Fe3O4 thin film",

abstract = "We have investigated the ultrafast laser-induced magnetization and reflectivity dynamics in the Fe3O4 thin film using all-optical pump–probe measurements. The high-quality of our sample is verified by the temperature-dependent static magnetic properties, showing a clear Verwey transition. Although the Fe3O4 is predicted to be a half-metal, the demagnetization process upon laser incident shows a transition-metal-like behavior. The demagnetization characteristic time has been found to be in sub-100 fs (fs) time scale, suggesting the dominant interaction of hole spin-flip processes. The spin relaxation process has been found to be around 600 fs, which is attributed to the electron–phonon coupling in accordance to the observed two electron–phonon coupling modes in reflectivity dynamics. Our results provide new insight into the ultrafast laser-induced spin dynamics in half-metallic ferrimagnet.",

keywords = "Epitaxial FeO film, Half-metal, TR-MOKE, Ultrafast demagnetization",

author = "Xianyang Lu and Guanqi Li and Yuting Gong and Xuezhong Ruan and Yu Yan and Yao Li and Liang He and Jun Du and Lazarov, {Vlado K.} and Jing Wu and Rong Zhang and Yongbing Xu",

note = "Funding Information: This work is supported by National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant No. 61427812, 11774160, 51971109, 51871236, 61805116, and 51771053), the Natural Science Foundation of Jiangsu Province of China (No. BK20200307, BK20192006, and BK20180056), the Fundamental Research Funds for the Central Universities (Grant No. 021014380113). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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T1 - Sub-100 femtosecond time scale spin dynamics in epitaxial Fe3O4 thin film

AU - Lu, Xianyang

AU - Li, Guanqi

AU - Gong, Yuting

AU - Ruan, Xuezhong

AU - Yan, Yu

AU - Li, Yao

AU - He, Liang

AU - Du, Jun

AU - Lazarov, Vlado K.

AU - Wu, Jing

AU - Zhang, Rong

AU - Xu, Yongbing

N1 - Funding Information: This work is supported by National Key Research and Development Program of China (Grant No. 2016YFA0300803), the National Natural Science Foundation of China (Grant No. 61427812, 11774160, 51971109, 51871236, 61805116, and 51771053), the Natural Science Foundation of Jiangsu Province of China (No. BK20200307, BK20192006, and BK20180056), the Fundamental Research Funds for the Central Universities (Grant No. 021014380113). Publisher Copyright: © 2021 Elsevier B.V.

PY - 2022/1/15

Y1 - 2022/1/15

N2 - We have investigated the ultrafast laser-induced magnetization and reflectivity dynamics in the Fe3O4 thin film using all-optical pump–probe measurements. The high-quality of our sample is verified by the temperature-dependent static magnetic properties, showing a clear Verwey transition. Although the Fe3O4 is predicted to be a half-metal, the demagnetization process upon laser incident shows a transition-metal-like behavior. The demagnetization characteristic time has been found to be in sub-100 fs (fs) time scale, suggesting the dominant interaction of hole spin-flip processes. The spin relaxation process has been found to be around 600 fs, which is attributed to the electron–phonon coupling in accordance to the observed two electron–phonon coupling modes in reflectivity dynamics. Our results provide new insight into the ultrafast laser-induced spin dynamics in half-metallic ferrimagnet.

AB - We have investigated the ultrafast laser-induced magnetization and reflectivity dynamics in the Fe3O4 thin film using all-optical pump–probe measurements. The high-quality of our sample is verified by the temperature-dependent static magnetic properties, showing a clear Verwey transition. Although the Fe3O4 is predicted to be a half-metal, the demagnetization process upon laser incident shows a transition-metal-like behavior. The demagnetization characteristic time has been found to be in sub-100 fs (fs) time scale, suggesting the dominant interaction of hole spin-flip processes. The spin relaxation process has been found to be around 600 fs, which is attributed to the electron–phonon coupling in accordance to the observed two electron–phonon coupling modes in reflectivity dynamics. Our results provide new insight into the ultrafast laser-induced spin dynamics in half-metallic ferrimagnet.

KW - Epitaxial FeO film

KW - Half-metal

KW - TR-MOKE

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