Abstract
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.
Highlights
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
The van der Waals (vdW) magnets in the 2D limit host rich magneto-electrical, magneto-optical, or spin–lattice coupling effects that are capable of producing intriguing properties which are scarcely observed in bulk
We have reported the investigation on the critical behavior of Fe5GeTe2, which finds that the obtained set of critical exponents are close to those calculated from the renormalization group approach for a long-range 3D Heisenberg model with the magnetic exchange distance decaying as J(r) ≈ r−4.916
Summary
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. A small anisotropy is sufficient to open up a sizable gap in the magnon spectra and stabilizes the magnetic order against finite temperature This picture has been realized by the observation of long-range ferromagnetic (FM) order in mono- or few-layer C rI38, Cr2Ge2Te69, Cr2Si2Te610, VSe211, and MnSe212, etc. We have reported the investigation on the critical behavior of Fe5GeTe2, which finds that the obtained set of critical exponents are close to those calculated from the renormalization group approach for a long-range 3D Heisenberg model with the magnetic exchange distance decaying as J(r) ≈ r−4.916
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