Ultrafast Spin Dynamics in the Chiral Helimagnet Cr<sub>1/3</sub>NbS<sub>2</sub>

ORAL

Abstract

The control of charge and spin degree of freedom of materials by ultrafast optical pulse enables novel sensing technology, quantum computing, terahertz emission, ultrafast optical switching, and ultrafast data storage. Chiral helimagnetic materials have recently attracted much attention for spintronic applications owing to their long-range helical magnetic order, topological spin textures, and potential for hosting skyrmions. Here, we present an ultrafast spin dynamics study in single crystals of chiral helimagnet Cr1/3NbS2 using the time-resolved magneto-optical Kerr effect technique. At low temperature and low external magnetic field, Cr1/3NbS2 exhibits a chiral helical magnetic phase with long-range helical spin order but contains a zero net magnetic moment. Due to the high uniaxial anisotropy of the crystal, a linearly polarized femtosecond laser pulse can magnetize the material in tens of ps, which brings the system into the chiral conical phase at zero-field and tilted chiral soliton lattice phase at a higher external magnetic field. In addition, we have found that the magnetic field-dependence of spin precession frequency in this helimagnet does not obey Landau-Lifshitz-Gilbert formalism as applied for ferromagnetic materials in general.

*NSF Grant no. ECCS-1952957

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Presenters

  • Minh Tuan Trinh

    • Physics, University of South Florida

Authors

  • Hengzhou Liu

    • University of South Florida
    • Physics, University of South Florida

  • Minh Tuan Trinh

    • Physics, University of South Florida

  • Ellie M Clements

    • Physics, University of South Florida

  • Ling Li

    • University of Tennessee

  • David George Mandrus

    • Materials Science and Technology Division, Oak Ridge National Labratory
    • Materials Science and Engineering, University of Tennessee
    • Department of Materials Science and Engineering, University of Tennessee
    • University of Tennessee
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
    • Oakridge National Laboratory
    • Materials Science and Engineering, University of Tennessee, Knoxville
    • Oak Ridge National Laboratory
    • University of Tennessee - Knoxville
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Department of Physics, University of Tennessee Knoxville
    • Materials Science and Technology, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Materials Science and Technology Division
    • Department of Materials Science, The University of Tennessee
    • University of Tennessee, Knoxville

  • Hariharan Srikanth

    • Physics, University of South Florida
    • Univ of South Florida

  • Manh-Huong Phan

    • Univ of South Florida
    • Physics, University of South Florida

  • Denis Karaiskaj

    • Univ of South Florida
    • University of South Florida
    • Physics, University of South Florida