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Magnetization dynamics of room-temperature vdWs magnet Fe<sub>5</sub>GeTe<sub>2</sub>

ORAL

Abstract

Two-dimensional (2D) van der Waals (vdWs) materials have gathered a lot of attention in recent years due to their potential applications for spintronic devices. A big setback with these 2D crystals is their low Curie temperatures Tc < 300 K. As a promising room-temperature vdWs magnet, Fe5GeTe2 has gained a lot of attention because of its high Tc of about 270 K[1]. In our work, we synthesized bulk Fe5GeTe2 crystals and studied the magnetic properties by temperature-dependent vibrating sample magnetometry (VSM) and ferromagnetic resonance (FMR) techniques. VSM measurements of the bulk Fe5GeTe2 sample reveal an in-plane anisotropy with a Curie temperature of 320 K. Thermal capacity measurements show that the sample experiences phase transitions which can be correlated with the changes in magnetism. From the FMR measurements, the gyromagnetic ratio shows a disparity along the in-plane and out-of-plane directions, indicative of orbital momentum contribution. Moreover, the low intrinsic damping indicates a weak intervalley scattering in Fe5GeTe2, making it an interesting platform to study spin dynamics.


[1] May et al, Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe5GeTe2. ACS Nano 13, 4436 (2019).

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Presenters

  • Laith Alahmed

    Electrical and Computer Engineering, Auburn University

Authors

  • Laith Alahmed

    Electrical and Computer Engineering, Auburn University

  • Bhuwan Nepal

    Physics and Astronomy, Alabama University, Physics, University of Alabama

  • Juan Macy

    National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Florida State University

  • Kaya Wei

    National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Florida State University, CMS, National High Magnetic Laboratory, Florida State University

  • Wenkai Zheng

    National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Florida State University

  • Arjun Sapkota

    The University of Alabama, Physics, University of Alabama

  • Alessandro Mazza

    Materials Science and Technology Division, Oak Ridge National Lab, Materials Science and Technology Division, Oak Ridge National Laboratory

  • Matthew Brahlek

    Oak Ridge National Lab, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory

  • Wencan Jin

    Auburn University, Physics, Auburn University, University of Michigan, Department of Physics, Auburn University

  • Shulei Zhang

    Case Western Reserve University, Physics, Case Western Reserve University, Department of Physics, Case Western Reserve University

  • Claudia K.A. Mewes

    The University of Alabama, Physics, University of Alabama, Physics and Astronomy, University of Alabama -Tuscaloosa

  • Luis Balicas

    National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab, Condensed Matter Science, National High Magnetic Field Laboratory

  • Tim Mewes

    Department of Physics and Astronomy, The University of Alabama, The University of Alabama, Physics and Astronomy, Alabama University, Physics, University of Alabama, Physics and Astronomy, University of Alabama -Tuscaloosa

  • Peng Li

    Auburn University, Electrical and Computer Engineering, Auburn University