Abstract
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.
Highlights
Since the discovery of the graphene, two-dimensional (2D) materials have generated significant interests in recent year[1,2,3]
Considering the similar 2D AFM ground state at low temperature and 3D critical behavior near phase transition temperature in Fe3GeTe2 and MPX3, it is of great interest to investigate whether a critical phase transition from 3D to 2D will occur with decreasing temperature in Fe3GeTe2 like that in MPX3
We have reported a comprehensive study on the critical behavior of the PM-FM phase transition in the high TC van der Waals (VDW) bonded ferromagnet Fe3GeTe2
Summary
Since the discovery of the graphene, two-dimensional (2D) materials have generated significant interests in recent year[1,2,3] Their amazing physics has inspired extensive research on van der Waals (VDW) bonded heterostructures and application-oriented configurations. The ideal VDW bonded magnetic material should maintain its ferromagnetism upon exfoliating down to single layer and must have a high Curie temperature (TC). Fe3GeTe2 is a layered material which belongs to the P63/mmc space group[7] It contains Fe3Ge slabs separated by VDW bonded Te layers. The magnetic exchange distance is found to decay as J(r) ≈ r−4.6, which is close to that of mean-field model (r−4.5) with long-range interaction
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