Extrinsic anomalous Hall effect in van der Waals ferromagnet Fe5GeTe2

Suzuki, Ryuki; Gao, Tenghua; Okamoto, Hiroyuki; Ando, Kotoji

doi:10.1063/5.0112456

Cited by 7 publications

(2 citation statements)

References 40 publications

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“…Figure c shows the Hall resistance as the function of magnetic field at 200 K and different angles. When θ = 0°, a large anomalous Hall effect and anomalous Hall angle (4.3%) are observed, which is consistent with previous literature reports. − The Hall resistance gradually reduces as the θ enhancing from 0 to 90°. This phenomenon arises due to the gradual reduction of the vertical component of the external magnetic field with the increasing angle.…”

Section: Resultssupporting

confidence: 92%

Antisymmetric Peaks Observed in the Hall Resistance of Fe₅GeTe₂ Ferromagnets: Implications for Spintronic Devices

Zhang,

Wang,

Feng

et al. 2023

ACS Appl. Nano Mater.

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is a van der Waals ferromagnetic metal, which has a Curie temperature at room temperature higher than that of Fe 3 GeTe 2 . Despite extensive studies on Fe 5 GeTe 2 's performance, its magnetism remains poorly understood, particularly the in-plane electrical transport and angle dependence, which have not been reported yet. In this paper, we report angle-dependent Hall resistance and magnetoresistance in Fe 5 GeTe 2 flakes, demonstrating that the Hall resistance shows an antisymmetric peak when the magnetic field is parallel to the current. Systematic temperature and angle dependence magneto-transport characterizations reveal that the observed antisymmetric peak in the Hall resistance is closely correlated with the magnetic order in Fe 5 GeTe 2 , providing evidence of its significant in-plane magnetic anisotropy. Our findings offer insights into the electrical transport properties of Fe 5 GeTe 2 , which are essential for the development and application of Fe 5 GeTe 2 -based spintronic devices.

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Section: Resultssupporting

confidence: 92%

Antisymmetric Peaks Observed in the Hall Resistance of Fe₅GeTe₂ Ferromagnets: Implications for Spintronic Devices

Zhang,

Wang,

Feng

et al. 2023

ACS Appl. Nano Mater.

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“…The mass increase of the conduction electrons leads to electrodynamical changes such as a strong increase in the Sommerfeld coefficient 8,37 and a transfer of optical spectral weight toward lower frequencies 45 . Besides the Kondo physics, FGT also exhibits strong electron-phonon (e-ph) coupling 15,46 and large anomalous Hall effect, which are linked to the presence of topological nodal states 45,47,48 and an enhanced skew scattering 49 , respectively for F3GT and F5GT.…”

Section: Introductionmentioning

confidence: 99%

Light-driven Electrodynamics and Demagnetization in FenGeTe2 (n = 3, 5) Thin Films

Lupi,

Tomarchio,

Polewczyk

et al. 2024

Preprint

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Two-dimensional materials-based ultrafast spintronics is expected to surpass conventional data storage and manipulation technologies, that are now reaching their fundamental limits. The newly discovered van der Waals (VdW) magnets provide a new platform for ultrafast spintronics since their magnetic and electrical properties can be tuned by many external factors, such as strain, voltage, magnetic field, or light absorption for instance. Here, we report on the direct relationship between magnetic order and Terahertz (THz) electrodynamics in FenGeTe2 (n = 3, 5) (FGT) films after being illuminated by a femtosecond optical pulse, studying their ultrafast THz response as a function of the optical pump-THz probe temporal delay. In Fe5GeTe2, we find clear evidence that light-induced electronic excitations directly influence THz electrodynamics similarly to a demagnetization process, contrasting with the effects observed in Fe3GeTe2, which are characterized by a thermal energy transfer among electrons, magnons, and phonons. We address these effects as a function of the pump fluence and pump-probe delay, and by tuning the temperature across the magnetic ordering Curie temperature, highlighting the microscopic mechanisms describing the out-of-equilibrium evolution of the THz conductivity. Finally, we find evidence for the incoherent-coherent crossover predicted by the Kondo-Ising scenario in Fe3GeTe2 and successfully simulate its light-driven electrodynamics through a three-temperature model. As indicated by these results, FGT surpasses conventional metals in terms of modulating its properties using an optical lever.

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Intrinsic Anomalous Hall Conductivity of Strained Fe: A Combination Approach

Ly,

Kien,

Cuong

2024

IEEJ Transactions Elec Engng

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In this study, the effect of elastic biaxial strain on electronic structure and the anomalous Hall conductivity (AHC) of α‐Fe has been systematically studied by using the combination of a first principles calculation with the tight binding method through the Wannier function. It is found that applying strain in cubic structure of α‐Fe results in the reduction of crystal symmetry and gives the modification on the bands near Fermi level, which causes a significant change in the AHC of strained systems. The AHC of strained α‐Fe is found to be sensitive with applying strain, which shows the large enhancement of AHC at +2% tensile strain with AHC value is up to 929 Ω−1 cm−1 (increases more than 30%) compared with the unstrained one, while slightly reduces when applying compressive strain. The modification of AHC is found to be related to the change of Berry curvature contributed from the spin orbit coupling (SOC) induced energy gap near Fermi level. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Extrinsic anomalous Hall effect in van der Waals ferromagnet Fe5GeTe2

Cited by 7 publications

References 40 publications

Antisymmetric Peaks Observed in the Hall Resistance of Fe₅GeTe₂ Ferromagnets: Implications for Spintronic Devices

Antisymmetric Peaks Observed in the Hall Resistance of Fe₅GeTe₂ Ferromagnets: Implications for Spintronic Devices

Light-driven Electrodynamics and Demagnetization in FenGeTe2 (n = 3, 5) Thin Films

Intrinsic Anomalous Hall Conductivity of Strained Fe: A Combination Approach

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Extrinsic anomalous Hall effect in van der Waals ferromagnet Fe5GeTe2

Cited by 7 publications

References 40 publications

Antisymmetric Peaks Observed in the Hall Resistance of Fe5GeTe2 Ferromagnets: Implications for Spintronic Devices

Antisymmetric Peaks Observed in the Hall Resistance of Fe5GeTe2 Ferromagnets: Implications for Spintronic Devices

Light-driven Electrodynamics and Demagnetization in FenGeTe2 (n = 3, 5) Thin Films

Intrinsic Anomalous Hall Conductivity of Strained Fe: A Combination Approach

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Antisymmetric Peaks Observed in the Hall Resistance of Fe₅GeTe₂ Ferromagnets: Implications for Spintronic Devices

Antisymmetric Peaks Observed in the Hall Resistance of Fe₅GeTe₂ Ferromagnets: Implications for Spintronic Devices