Anomalous spin dynamics in a two-dimensional magnet induced by anisotropic critical fluctuations

Li, Zefang; Xu, Donghai; Li, Xue; Liao, Huijuan; Xi, Xuekui; Yu, Yi-Cong; Wang, Wenhong

doi:10.1103/physrevb.106.054427

Cited by 8 publications

(10 citation statements)

References 33 publications

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“…33 According to the fitting results listed in Table 1, both the Gilbert damping and inhomogeneous broadening of Ni are increased by the FGT interface. Previous work has shown that inhomogeneous broadening may result from interfacial magnetic coupling, 34 which gives rise to the inhomogeneous magnetization texture, which is consistent with the MFM result in Fig. 1(d).…”

Section: Spin-torque Fmrsupporting

confidence: 90%

“…Beyond the spin-orbit coupling-induced g-factor shift at zero field, the Nagata theory [120,121] indicates that a correction of g-factor shift under high-temperature perturbation approximation and in the presence of finite magnetic field should be considered for the studies of critical phenomena in low-dimensional magnet. Recently, temperature dependence of g-factor in ferromagnetic semiconductor CrSiTe 3 has been investigated using broadband three-dimensional vector-ferromagnetic resonance experiments [34]. As shown in Fig.…”

Section: B Temperature Dependence Of G Shiftmentioning

confidence: 99%

“…In addition, the interlayer exchange coupling may cause the off-resonance precession of Ni at the interface, which opens an additional channel for spin angular momentum dissipation and then enhances the Gilbert damping of the Ni layer. 34 It is known that an ordered magnetic structure is more likely to be formed at a lower temperature because of the debilitated thermal effect. Therefore, the effect originating from interlayer exchange coupling is expected to be more robust at a lower temperature.…”

Section: Spin-torque Fmrmentioning

confidence: 99%

“…The success of this approach highlights that the intrinsic character of short-range interactions in finite systems can overcome thermal fluctuations and stabilize long-range magnetic order in the 2D limit [17]. Stimulated by this discovery, a rich collection of vdW magnetic materials covering a wide spectrum of magnetic properties are experimental demonstrated using exfoliation, chemical vapor deposition (CVD), and molecular beam epitaxy (MBE) methods, including binary transition metal halides (VI 3 [18], CrCl 3 [19], CrBr 3 [20]), binary transition metal chalcogenides (CrTe 2 [21][22][23], VSe 2 [24], VTe 2 and NbTe 2 [25], Cr 3 X 4 (X = S, Se, Te) [26]), ternary transition metal compounds (MPS 3 or MPSe 3 (M = Mn, Fe, Ni) [27], Fe n GeTe 2 (n = 3, 4, 5) [28][29][30][31], MnBi 2 Te 4 [32], CrSBr [33], CrSiTe 3 [34]), and other binary transition metal compounds (MnSe x [35], CrB 2 [36]). For a more extended summary of currently known 2D vdW magnets and their synthesis methods, several recent review articles focused on the material landscape are available [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

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Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Tang¹,

Alahmed²,

Mahdi³

et al. 2023

Preprint

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The discovery of atomic monolayer magnetic materials has stimulated intense research activities in the two-dimensional (2D) van der Waals (vdW) materials community. The field is growing rapidly and there has been a large class of 2D vdW magnetic compounds with unique properties, which provides an ideal platform to study magnetism in the atomically thin limit. In parallel, based on tunneling magnetoresistance and magneto-optical effect in 2D vdW magnets and their heterostructures, emerging concepts of spintronic and optoelectronic applications such as spin tunnel field-effect transistors and spin-filtering devices are explored. While the magnetic ground state has been extensively investigated, reliable characterization and control of spin dynamics play a crucial role in designing ultrafast spintronic devices. Ferromagnetic resonance (FMR) allows direct measurements of magnetic excitations, which provides insight into the key parameters of magnetic properties such as exchange interaction, magnetic anisotropy, gyromagnetic ratio, spin-orbit coupling, damping rate, and domain structure. In this review article, we present an overview of the essential progress in probing spin dynamics of 2D vdW magnets using FMR techniques. Given the dynamic nature of this field, we focus mainly on the broadband FMR, optical FMR, and spin-torque FMR, and their applications in studying prototypical 2D vdW magnets including CrX3 (X = Cl, Br, I), Fe5GeTe2, and Cr2Ge2Te6. We conclude with the recent advances in laboratory-and synchrotron-based FMR techniques and their opportunities to broaden the horizon of research pathways into atomically thin magnets.

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Section: Spin-torque Fmrsupporting

confidence: 90%

Section: B Temperature Dependence Of G Shiftmentioning

confidence: 99%

Section: Spin-torque Fmrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Tang¹,

Alahmed²,

Mahdi³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…For CST, a clear longrange FM transition is found at T c = 33 K, agreeing well with other studies. [37][38][39]41,42] A Curie-Weiss (CW) fit can well describe the inverse susceptibility 1/𝜒 of CST above 150 K, as presented in the inset of Figure 1c. At lower temperatures, 1/𝜒 deviates from the linear Curie-Weiss expectation, suggesting the appearance of sizable short-range spin fluctuations.…”

Section: Structural and Thermodynamic Propertiesmentioning

confidence: 99%

Spin‐Phonon Scattering‐Induced Low Thermal Conductivity in a van der Waals Layered Ferromagnet Cr₂Si₂Te₆

Yang

et al. 2023

Adv Funct Materials

Self Cite

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Layered van der Waals (vdW) magnets are prominent playgrounds for developing magnetoelectric, magneto‐optic, and spintronic devices. In spintronics, particularly in spincaloritronic applications, low thermal conductivity (κ) is highly desired. Herein, by combining thermal transport measurements with density functional theory calculations, this study demonstrates low κ down to 1 W m−1 K−1 in a typical vdW ferromagnet Cr2Si2Te6. In the paramagnetic state, development of magnetic fluctuations way above Tc = 33 K strongly reduces κ via spin‐phonon scattering, leading to low κ ≈ 1 W m−1 K−1 over a wide temperature range, in comparable to that of amorphous silica. In the magnetically ordered state, emergence of resonant magnon‐phonon scattering limits κ below ≈2 W m−1 K−1, which will be three times larger if magnetic scatterings are absent. Application of magnetic fields strongly suppresses the spin‐phonon scattering, giving rise to large enhancements of κ. This study's calculations well capture these complex behaviors of κ by taking the temperature‐ and magnetic‐field‐dependent spin‐phonon scattering into account. Realization of low κ, which is easily tunable by magnetic fields in Cr2Si2Te6, may further promote spincaloritronic applications of vdW magnets. This study's theoretical approach may also provide a generic understanding of spin‐phonon scattering, which appears to play important roles in various systems.

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Electron Spin Resonance Spectroscopy on Magnetic van der Waals Compounds

Kataev,

Büchner,

Alfonsov

2024

Appl Magn Reson

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The field of research on magnetic van der Waals compounds—a special subclass of quasi-two-dimensional materials—is currently rapidly expanding due to the relevance of these compounds to fundamental research where they serve as a playground for the investigation of different models of quantum magnetism and also in view of their unique magneto-electronic and magneto-optical properties pertinent to novel technological applications. The electron spin resonance (ESR) spectroscopy plays an important role in the exploration of the rich magnetic behavior of van der Waals compounds due to its high sensitivity to magnetic anisotropies and unprecedentedly high energy resolution that altogether enable one to obtain thorough insights into the details of the spin structure in the magnetically ordered state and the low-energy spin dynamics in the ordered and paramagnetic phases. This article provides an overview of the recent achievements in this field made by the ESR spectroscopic techniques encompassing representatives of antiferro- and ferromagnetic van der Waals compounds of different crystal structures and chemical composition as well as of a special category of these materials termed magnetic topological insulators.

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Anomalous spin dynamics in a two-dimensional magnet induced by anisotropic critical fluctuations

Cited by 8 publications

References 33 publications

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Spin‐Phonon Scattering‐Induced Low Thermal Conductivity in a van der Waals Layered Ferromagnet Cr₂Si₂Te₆

Electron Spin Resonance Spectroscopy on Magnetic van der Waals Compounds

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Anomalous spin dynamics in a two-dimensional magnet induced by anisotropic critical fluctuations

Cited by 8 publications

References 33 publications

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Spin‐Phonon Scattering‐Induced Low Thermal Conductivity in a van der Waals Layered Ferromagnet Cr2Si2Te6

Electron Spin Resonance Spectroscopy on Magnetic van der Waals Compounds

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Product

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Spin‐Phonon Scattering‐Induced Low Thermal Conductivity in a van der Waals Layered Ferromagnet Cr₂Si₂Te₆