Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2

Abstract

The magnetic structure and phase diagram of the layered ferromagnetic compound Fe${}_3$GeTe${}_2$ has been investigated by a combination of synthesis, x-ray and neutron diffraction, high resolution microscopy, and magnetization measurements. Single crystals were synthesized by self-flux reactions, and single crystal neutron diffraction finds ferromagnetic order with moments of 1.11(5)${\mu }_B$/Fe aligned along the $c$-axis at 4K. These flux-grown crystals have a lower Curie temperature $T_{\text{c}}\approx$150K compared to crystals previously grown by vapor transport ($T_{\text{c}}$=220K). The difference is a reduced Fe content in the flux grown crystals, as illustrated by the behavior observed in a series of polycrystalline samples. As Fe-content decreases, so does the Curie temperature, magnetic anisotropy, and net magnetization. In addition, Hall effect and thermoelectric measurements on flux-grown crystals suggest multiple carrier types contribute to electrical transport in Fe${}_{3-x}$GeTe${}_2$ and structurally-similar Ni${}_{3-x}$GeTe${}_2$.

accepted version to be published in PRB; corrections made, includes Supplemental information

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Cited by in corpus (73)

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• Very Large Tunneling Magnetoresistance in Layered Magnetic Semiconductor CrI${}_3$
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• The study of magnetic topological semimetals by first principles calculations
• Critical behavior of the van der Waals bonded ferromagnet Fe${}_{3-x}$GeTe${}_2$
• Domain wall pinning and hard magnetic phase in Co-doped bulk single crystalline Fe3GeTe2
• Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism
• Planar topological Hall effect in a uniaxial van der Waals ferromagnet Fe3GeTe2
• Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped Fe${}_5$GeTe${}_2$ with $T_{\text{C}}$ up to 478 K
• Synthesis, Engineering, and Theory of 2D van der Waals Magnets
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• Magnetic exchange interactions in the van der Waals layered antiferromagnet MnPSe3
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• Chiral Spin Spirals at the Surface of the van der Waals Ferromagnet Fe${}_3$GeTe${}_2$
• Kondo holes in the 2D itinerant Ising ferromagnet Fe3GeTe2
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• Electronic structure of above-room-temperature van der Waals ferromagnet Fe${}_3$GaTe${}_2$
• Generic Seebeck Effect From Spin Entropy
• Pressure-Induced Modification of Anomalous Hall Effect in Layered Fe${}_3$GeTe${}_2$
• Selectively controlled ferromagnets by electric fields in van der Waals ferromagnetic heterojunctions
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• Neutron spectroscopy evidence on the dual nature of magnetic excitations in a van der Waals metallic ferromagnet Fe${}_{2.72}$GeTe${}_2$
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• Large-area synthesis of ferromagnetic Fe${}_{5-x}$GeTe${}_2$/graphene van der Waals heterostructures with Curie temperature above room temperature
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• Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe${}_{3-x}$GeTe${}_2$: the role of Fe vacancies
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