Strong anisotropy and magnetostriction in the two-dimensional Stoner ferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>GeTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Zhuang, Houlong; Kent, Paul; Hennig, Richard G.

doi:10.1103/physrevb.93.134407

Cited by 368 publications

(239 citation statements)

References 58 publications

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“…First, its superior stability is confirmed by the non-imaginary frequencies in phonon spectrum calculations. 20 Indeed, the oxidation process of Fe 3 GeTe 2 in our experiments is slower in comparison with CrGeTe 3 . Second, it is predicted to be an itinerant ferromagnet with a relatively high-Curie temperature around 220 K. 26 Essentially, this becomes a very important figure of merit for spin-based technology architecture.…”

Section: Introductionmentioning

confidence: 93%

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Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

et al. 2017

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Recently, layered two-dimensional ferromagnetic materials (2D FMs) have attracted a great deal of interest for developing lowdimensional magnetic and spintronic devices. Mechanically exfoliated 2D FMs were discovered to possess ferromagnetism down to monolayer. It is therefore of great importance to investigate the distinct magnetic properties at low dimensionality. Here, we report the wafer-scale growth of 2D ferromagnetic thin films of Fe 3 GeTe 2 via molecular beam epitaxy, and their exotic magnetic properties can be manipulated via the Fe composition and the interface coupling with antiferromagnetic MnTe. A 2D layer-by-layer growth mode has been achieved by in situ reflection high-energy electron diffraction oscillations, yielding a well-defined interlayer distance of 0.82 nm along {002} surface. The magnetic easy axis is oriented along c-axis with a Curie temperature of 216.4 K. Remarkably, the Curie temperature can be enhanced when raising the Fe composition. Upon coupling with MnTe, the coercive field dramatically increases 50% from 0.65 to 0.94 Tesla. The large-scale layer-by-layer growth and controllable magnetic properties make Fe 3 GeTe 2 a promising candidate for spintronic applications. It also opens up unprecedented opportunities to explore rich physics when coupled with other 2D superconductors and topological matters.

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Section: Introductionmentioning

confidence: 93%

“…All of them require a large difference between anisotropy energy and thermal activation energy k B T for stable storage. 20 In addition, the perpendicular magnetic anisotropy provides lower switching current in comparison with the in-plane one. 37,38 Here, we investigate 2D FM Fe 3 GeTe 2 thin films grown on sapphire and GaAs by MBE.…”

Section: Introductionmentioning

confidence: 99%

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

et al. 2017

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“…In SrCoO 3 , a Co-based perovskite, a spin reorientation change under 1.1 GPa pressure was suggested by density functional theory calculations [9]. Recent calculations [10] also predict giant pressure induced changes in the MAE of a layered ferromagnet, Fe 3 GeTe 2 . Here, we employ a pressure cell to apply moderate hydrostatic pressure to a CGT crystal up to 2 GPa.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Lin

Lohmann

Ali

et al. 2018

Phys. Rev. Materials

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Anisotropic magnetoresistance (AMR) of Cr 2 Ge 2 Te 6 (CGT), a layered ferromagnetic insulator, is investigated under an applied hydrostatic pressure up to 2 GPa. The easy axis direction of the magnetization is inferred from the AMR saturation feature in the presence and absence of the applied pressure. At zero applied pressure, the easy axis is along the cdirection or perpendicular to the layer. Upon application of a hydrostatic pressure>1 GPa, the uniaxial anisotropy switches to easy-plane anisotropy which drives the equilibrium magnetization from the c-axis to the ab-plane at zero magnetic field, which amounts to a giant magnetic anisotropy energy change (>100%). As the temperature is increased across the Curie temperature, the characteristic AMR effect gradually decreases and disappears. Our first-principles calculations confirm the giant magnetic anisotropy energy change with moderate pressure and assign its origin to the increased off-site spin-orbit interaction of Te atoms due to a shorter Cr-Te distance. Such a pressure-induced spin reorientation transition is very rare in three-dimensional ferromagnets, but it may be common to other layered ferromagnets with similar crystal structures to CGT, and therefore offers a unique way to control magnetic anisotropy.

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“…Within this context, Fe 3 GeTe 2 , a VDW metallic ferromagnet, has recently attracted significant attention due to its high Curie temperature and the prediction of the important coexistence of ferromagnetic (FM) and metallic properties upon exfoliating down to nanosheets 7, 8 .…”

Section: Introductionmentioning

confidence: 99%

Critical behavior of the van der Waals bonded high T C ferromagnet Fe3GeTe2

Liu

Zou

Zhou

et al. 2017

Sci Rep

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Fe3GeTe2 is a promising candidate for van der Waals bonded ferromagnet because of its high Curie temperature and the prediction that its ferromagnetism can maintain upon exfoliating down to single layer. Here, we have reported the critical behavior to understand its ferromagnetic exchange. Based on various techniques including modified Arrott plot, Kouvel-Fisher plot, and critical isotherm analysis, a set of reliable critical exponents (β = 0.327 ± 0.003, γ = 1.079 ± 0.005, and δ = 4.261 ± 0.009) has been obtained. The critical behavior suggests a three-dimensional long-range magnetic coupling with the exchange distance decaying as J(r) ≈ r −4.6 in Fe3GeTe2. The possible origin of three-dimensional magnetic characteristics in van der Waals bonded magnets is discussed.

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Strong anisotropy and magnetostriction in the two-dimensional Stoner ferromagnetFe3GeTe2

Cited by 368 publications

References 58 publications

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy

Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Critical behavior of the van der Waals bonded high T C ferromagnet Fe3GeTe2

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