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Ultrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet.
Lu, Xianyang; Lin, Zhiyong; Pi, Hanqi; Zhang, Tan; Li, Guanqi; Gong, Yuting; Yan, Yu; Ruan, Xuezhong; Li, Yao; Zhang, Hui; Li, Lin; He, Liang; Wu, Jing; Zhang, Rong; Weng, Hongming; Zeng, Changgan; Xu, Yongbing.
Afiliação
  • Lu X; School of Integrated Circuits, Nanjing University, Suzhou, 215163, China.
  • Lin Z; State Key Laboratory of Spintronics Devices and Technologies, Nanjing University, Suzhou, 215163, China.
  • Pi H; Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
  • Zhang T; International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
  • Li G; CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
  • Gong Y; Beijing National Research Center for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
  • Yan Y; School of Physical Science, University of Chinese Academy of Sciences, Beijing, 100049, China.
  • Ruan X; Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
  • Li Y; Department of Chemistry, University of Pennsylvania, Philadelphia, PA, 19104-6323, USA.
  • Zhang H; School of Integrated Circuits, Guangdong University of Technology, Guangzhou, 510006, China.
  • Li L; State Key Laboratory of Spintronics Devices and Technologies, Nanjing University, Suzhou, 215163, China.
  • He L; Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
  • Wu J; State Key Laboratory of Spintronics Devices and Technologies, Nanjing University, Suzhou, 215163, China.
  • Zhang R; Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
  • Weng H; State Key Laboratory of Spintronics Devices and Technologies, Nanjing University, Suzhou, 215163, China.
  • Zeng C; Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
  • Xu Y; State Key Laboratory of Spintronics Devices and Technologies, Nanjing University, Suzhou, 215163, China.
Nat Commun ; 15(1): 2410, 2024 Mar 18.
Article em En | MEDLINE | ID: mdl-38499551
ABSTRACT
The magnetic type-II Weyl semimetal (MWSM) Co3Sn2S2 has recently been found to host a variety of remarkable phenomena including surface Fermi-arcs, giant anomalous Hall effect, and negative flat band magnetism. However, the dynamic magnetic properties remain relatively unexplored. Here, we investigate the ultrafast spin dynamics of Co3Sn2S2 crystal using time-resolved magneto-optical Kerr effect and reflectivity spectroscopies. We observe a transient magnetization behavior, consisting of spin-flipping dominated fast demagnetization, slow demagnetization due to overall half-metallic electronic structures, and an unexpected ultrafast magnetization enhancement lasting hundreds of picoseconds upon femtosecond laser excitation. By combining temperature-, pump fluence-, and pump polarization-dependent measurements, we unambiguously demonstrate the correlation between the ultrafast magnetization enhancement and the Weyl nodes. Our theoretical modelling suggests that the excited electrons are spin-polarized when relaxing, leading to the enhanced spin-up density of states near the Fermi level and the consequently unusual magnetization enhancement. Our results reveal the unique role of the Weyl properties of Co3Sn2S2 in femtosecond laser-induced spin dynamics.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China
Texto completo
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XML
PubMed Links
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China