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Robust magnetization dynamics and magnetocaloric anomalies across the phase diagrams of noncollinear magnets

ORAL

Abstract

Incommensurate magnetic structures stabilized by the Dzyaloshinskii-Moriya interaction exhibit long-range phase coherence over macroscopic length scales. Depending on the crystal symmetry, the magnetocrystalline anisotropy controls the orientation of the propagation vector and may also enhance the robustness of the magnetic texture. We present recent studies on the magnetic phase evolution of noncollinear spin textures analyzing the nonlinear ac magnetic response and magnetocaloric effect for selected crystalline magnetic materials with broken inversion symmetry: Cr1/3NbS2, GaV4S8, and MnSi. Each realize solitonic spin textures of varying dimension and helicity due to distinct differences in magnetocrystalline anisotropy. By analyzing the anomalous nonlinear response and dynamic magnetic loss, we characterize the rigidity of the various spin textures against an ac magnetic field. Additionally, our magnetocaloric measurements uncover phase regimes characterized by field-induced spin fluctuations, where entropy increases across the metamagnetic transition. The combined analysis reveals details about the complex ordering and magnetization processes that may be useful for identifying new magnetic phases emerging from long-period spin textures.

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Presenters

  • Eleanor Clements

    Univ of South Florida

Authors

  • Eleanor Clements

    Univ of South Florida

  • Raja Das

    Phenikaa University

  • Ganesh Pokharel

    Physics, University of Tennessee, Physics and Astronomy, The University of Tennessee, Department of Physics & Astronomy, University of Tennessee, Knoxville, University of Tennessee, Department of Physics and Astronomy, The University of Tennessee, University of Tennessee, Knoxville

  • Ling Li

    University of Tennessee, Knoxville

  • David Mandrus

    Physics, University of Tennessee, Materials Science and Engineering, The University of Tennessee, Department of Materials Science & Engineering, University of Tennessee, Knoxville, The University of Tennesse, Knoxville, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Oak Ridge National Laboratory, Department of Materials Science and Engineering, University of Tennessee Knoxville, Department of Materials Science and Engineering, University of Tennessee, University of Tennessee, Knoxville, Material Science and Technology Division, Oak Ridge National Laboratory, Material Science and Technology Division, Oak Ridge National Lab

  • Michael Osofsky

    Naval Research Laboratory, United States Naval Research Laboratory, Naval Research Lab

  • Hariharan Srikanth

    Univ of South Florida

  • Manh-Huong Phan

    Department of Physics, University of South Florida, Univ of South Florida, Physics, University of South Florida