Publisher's Note: Critical behavior of the van der Waals bonded ferromagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>GeTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
 [Phys. Rev. B 
<b>96</b>
, 144429 (2017)]

Liu, Yu; Ivanovski, Valentin N.; Petrovic, C.

doi:10.1103/physrevb.101.049905

Cited by 24 publications

(47 citation statements)

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“…The FM ground state can also be demonstrated by the isothermal magnetization M(H) shown in Fig. 1b measured at 2 K. The low coercive field indicates a soft ferromagnetism in Fe 5 GeTe 2 , which is similar as that of Fe 3 GeTe 2 29,30 . The saturation magnetic moment along the c-axis is about 2.4 μ B /Fe, likely unveiling the magnetic anisotropy at low temperature.…”

Section: Resultsmentioning

confidence: 68%

“…The previous comprehensive study reached a conclusion that the critical exponent β for a 2D magnets lies in the range of ~ 0.1 ≤ β ≤ 0.25 44 . It is apparent that the β values of Cr 2 Si 2 Te 6 and Cr 2 Ge 2 Te 6 , which were verified as 2D Ising magnets 45,46 , are actually within the window, while those of Fe 3-x GeTe 2 and Fe 5 GeTe 2 are apparently larger than 0.25, thus excluding www.nature.com/scientificreports/ the 2D Ising model for them 29,30 . Moreover, the γ values of Fe 3-x GeTe 2 and Fe 5 GeTe 2 are much larger than those for the tricritical mean-field and 3D Ising models 38,39 , suggesting the two models are not appropriate.…”

Section: Resultsmentioning

confidence: 96%

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Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism

Xia

et al. 2020

Sci Rep

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The van der Waals ferromagnet Fe5GeTe2 has a Curie temperature TC of about 270 K, which is tunable through controlling the Fe deficiency content and can even reach above room temperature. To achieve insights into its ferromagnetic exchange that gives the high TC, the critical behavior has been investigated by measuring the magnetization in Fe5GeTe2 crystal around the ferromagnetic ordering temperature. The analysis of the measured magnetization by using various techniques harmonically reached to a set of reliable critical exponents with TC = 273.7 K, β = 0.3457 ± 0.001, γ = 1.40617 ± 0.003, and δ = 5.021 ± 0.001. By comparing these critical exponents with those predicted by various models, it seems that the magnetic properties of Fe5GeTe2 could be interpreted by a three-dimensional magnetic exchange with the exchange distance decaying as J(r) ≈ r−4.916, close to that of a three-dimensional Heisenberg model with long-range magnetic coupling.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 96%

Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism

Xia

et al. 2020

Sci Rep

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“…25 The average crystal structure and x-ray diffraction (XRD) of single and crushed crystals were reported in our previous paper. 32 Figure 1 shows the normalized Fe K-edge XANES spectra and Fourier transform magnitudes of EXAFS spectra of Fe 3−x GeTe 2 obtained at room temperature. The typical features of near edge are marked as A, B, C, and D [ Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Single crystals of Fe 3−x GeTe 2 were grown by the flux method. 32 The stoichiometry was measured by examination of multiple points using x-ray energy-dispersive spectroscopy (EDS) with a JEOL LSM-6500 scanning electron microscope (SEM). The x-ray absorption spectroscopy (XAS) measurements were performed at 8-ID beamline of the National Synchrotron Light Source II (NSLS II) at Brookhaven National Laboratory (BNL) in the transmission mode.…”

Section: Methodsmentioning

confidence: 99%

Anomalous Hall effect in the van der Waals bonded ferromagnet Fe3−xGeTe2

et al. 2018

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We report anomalous Hall effect (AHE) in single crystals of quasi-two-dimensional Fe3−xGeTe2 (x ≈ 0.36) ferromagnet grown by the flux method which induces defects on Fe site and bad metallic resistivity. Fe K-edge x-ray absorption spectroscopy was measured to provide information on local atomic environment in such crystals. The dc and ac magnetic susceptibility measurements indicate a second-stage transition below 119 K in addition to the paramagnetic to ferromagnetic transition at 153 K. A linear scaling behavior between the modified anomalous Hall resistivity ρxy/µ0H ef f and longitudinal resistivity ρ 2 xx M/µ0H ef f implies that the AHE in Fe3−xGeTe2 should be dominated by the intrinsic Karplus-Luttinger mechanism rather than the extrinsic skew-scattering and side-jump mechanisms. The observed deviation in the linear-M Hall conductivity σ A xy below 30 K is in line with its transport characteristic at low temperatures, implying the scattering of conduction electrons due to magnetic disorder and the evolution of the Fermi surface induced by possible spin-reorientation transition.

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“…The coupling between adjacent sheets seems to depend sensitively on temperature, chemical composition, lattice parameters, etc., 9,10 leading to a complex magnetic behavior that is readily tuned by its environment. For example, the perpendicular magnetic anisotropy depends sensitively on the chemical environment and tensile strain.…”

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confidence: 99%

Patterning-Induced Ferromagnetism of Fe₃GeTe₂ van der Waals Materials beyond Room Temperature

Yang

Gong³

et al. 2018

Nano Lett.

212

166

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Magnetic van der Waals (vdW) materials have emerged as promising candidates for spintronics applications, especially after the recent discovery of intrinsic ferromagnetism in monolayer vdW materials. There has been a critical need for tunable ferromagnetic vdW materials beyond room temperature. Here, we report a real-space imaging study of itinerant ferromagnet FeGeTe and the enhancement of its Curie temperature well above ambient temperature. We find that the magnetic long-range order in FeGeTe is characterized by an unconventional out-of-plane stripe-domain phase. In FeGeTe microstructures patterned by a focused ion beam, the out-of-plane stripe domain phase undergoes a surprising transition at 230 K to an in-plane vortex phase that persists beyond room temperature. The discovery of tunable ferromagnetism in FeGeTe materials opens up vast opportunities for utilizing vdW magnets in room-temperature spintronics devices.

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Publisher's Note: Critical behavior of the van der Waals bonded ferromagnet Fe3−xGeTe2 [Phys. Rev. B 96 , 144429 (2017)]

Cited by 24 publications

References 0 publications

Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism

Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism

Anomalous Hall effect in the van der Waals bonded ferromagnet Fe3−xGeTe2

Patterning-Induced Ferromagnetism of Fe₃GeTe₂ van der Waals Materials beyond Room Temperature

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Publisher's Note: Critical behavior of the van der Waals bonded ferromagnet Fe3−xGeTe2 [Phys. Rev. B 96 , 144429 (2017)]

Cited by 24 publications

References 0 publications

Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism

Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism

Anomalous Hall effect in the van der Waals bonded ferromagnet Fe3−xGeTe2

Patterning-Induced Ferromagnetism of Fe3GeTe2 van der Waals Materials beyond Room Temperature

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Patterning-Induced Ferromagnetism of Fe₃GeTe₂ van der Waals Materials beyond Room Temperature