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

By A. May, S. Calder, C. Cantoni, Huibo Cao, M. McGuire. 2015

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The magnetic structure and phase diagram of the layered ferromagnetic compound ${\mathrm{Fe}}_{3}{\mathrm{GeTe}}_{2}$ 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 $1.11(5){\ensuremath{\mu}}_{B}/\mathrm{Fe}$ aligned along the $c$ axis at 4 K. These flux-grown crystals have a lower Curie temperature ${T}_{\text{c}}\ensuremath{\approx}150$ K compared to crystals previously grown by vapor transport (${T}_{\text{c}}=220$ K). 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 ${\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{GeTe}}_{2}$ and structurally similar ${\mathrm{Ni}}_{3\ensuremath{-}x}{\mathrm{GeTe}}_{2}$.

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/142b8b1b85b86556e84409b9bfbf2a07556935ff

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