Spin dynamics study in layered van der Waals single-crystal Cr2Ge2Te6

2019/03/31 by Safe Khan, S. Khan, Christoph W. Zollitsch +13 · 1 citation
Materials Science · Physics and Astronomy · #2D Materials and Applications #Anisotropy #Condensed matter physics #Exponent #Ferromagnetic resonance #Heusler alloys: electronic and magnetic properties #Iron-based superconductors research #Magnetic anisotropy #Magnetic field #Magnetization #Magnetocrystalline anisotropy #Materials science #Physics #Quantum mechanics #Saturation (graph theory) #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.100.134437

published as Phys. Rev. B 100, 134437 (2019) · 13 pages, main text: page 1-8 with 6 figures, supplementary material: page 9-13 with 4 figures. Revised Manuscript: - Added references - Corrected Typos - Replaced figure 4 with a new figure - Modified discussion about figure 5

openalex created_date 2019/03/11 · arxiv created 2019/08/25 · openalex publication_date 2019/10/30 · arxiv updated 2019/11/05 · openalex updated_date 2026/08/05

Abstract

We study the magnetization dynamics of a bulk single crystal Cr₂Ge₂Te₆ (CGT), by means of broadband ferromagnetic resonance (FMR), for temperatures from 60 K down to 2 K. We determine the Kittel relations of the fundamental FMR mode as a function of frequency and static magnetic field for the magnetocrystalline easy---and hard---axis. The uniaxial magnetocrystalline anisotropy constant is extracted and compared with the saturation magnetization, when normalized with their low temperature values. The ratios show a clear temperature dependence when plotted in the logarithmic scale, which departs from the predicted Callen-Callen power law fit of a straight line, where the scaling exponent n , K_u(T)\ensuremath∝[M_s(T)/M_s(2\phantom\rule4pt0exK)]ⁿ, contradicts the expected value of 3 for uniaxial anisotropy. Additionally, the spectroscopic g factor for both the magnetic easy---and hard---axis exhibits a temperature dependence, with an inversion between 20 K and 30 K, suggesting an influence by orbital angular momentum. Finally, we qualitatively discuss the observation of multidomain resonance phenomena in the FMR spectras, at magnetic fields below the saturation magnetization.

Citations

• Projector augmented-wave method
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• Semiempirical GGA‐type density functional constructed with a long‐range dispersion correction
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• Density-functional theory and strong interactions: Orbital ordering in Mott-Hubbard insulators
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• Interplay between Kitaev interaction and single ion anisotropy in ferromagnetic CrI3 and CrGeTe3 monolayers

Cited by

• Magnomechanical Coupling in Suspended 2D van der Waals Ferromagnets

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