Magnetic and magneto-transport studies of two-dimensional ferromagnetic compound Fe₃GeTe₂

Abstract

We have systematically reported the magnetic and magneto-transport properties of two-dimensional itinerant ferromagnetic compound Fe 3 GeTe 2 at high magnetic fields of 58 T and demonstrated the correlation between its transport and magnetism. Anomalous two-steps magnetic ordering and antiferromagnetic-like transitions in zero field-cooling (ZFC) curves for H ab-plane are observed. Additionally, we find that intrinsic negative magnetoresistances in bulk Fe 3 GeTe 2 single crystal are mainly attributed to the suppression of spin-fluctuations in low magnetic fields. Complex evolutions of temperature dependent high field magnetoresistances are detected under different magnetic field and current configurations, which can be explained as a result of the competition between spin-fluctuations, the magnon-scatterings and classical cyclotronic effects.

Nonreciprocal Antisymmetric Magnetoresistance and Unconventional Hall Effect in a Two-Dimensional Ferromagnet

“…The atomic ratio of Fe, Ge, and Te is 60.35:13.44:26.21, nearing the stoichiometric ratio 5:1:2 when setting the content of Te as 2. The EDS result also reveals the existence of several iron vacancies, a phenomenon also reported previously in Fe 3 GeTe 2 and Fe 4 GeTe 2 crystals, − which may be an inherent aspect of the crystal growth process.…”

Layer-Dependent Magnetic Domains in Atomically Thin Fe5GeTe2

“…After 7 days, the assembly was slowly cooled to room temperature. The crystallographic phase and crystal quality were examined on a Bruker D8 single crystal X-ray diffractometer with Mo Kα radiation (λ = 0.71073 Å) at 300 K. 67 The chemical compositions and uniformity of stoichiometry were checked on several spots on the crystal by using energy dispersive spectroscopy, and the magnetic properties by superconducting quantum interference device (SQUID) magnetometry, yielding a transition temperature of 274 K. 67 For comparison, we also investigated well-characterized Fe 3 GeTe 2 crystals 17 , 68 , 69 (data shown in the Supporting Information ), which have a T C of 220 K.…”

“…The chemical compositions and uniformity of stoichiometry were checked on several spots on the crystal by using energy dispersive spectroscopy, and the magnetic properties by superconducting quantum interference device (SQUID) magnetometry, yielding a transition temperature of 274 K . For comparison, we also investigated well-characterized Fe 3 GeTe 2 crystals ,, (data shown in the Supporting Information), which have a T C of 220 K.…”

Probing antiferromagnetism in exfoliated Fe3GeTe2 using magneto-transport measurements

“…Our measured magnetoresistance values are similar in magnitude to those reported in past studies. 24,25 The presence of a competing ferromagnetic/antiferromagnetic order explains these results. While many previous studies on FGT samples of varying thicknesses report simple hysteresis loops that vary monotonically with temperature, others have reported similar trends in not only the Hall response but also in the anomalous Nernst response of the samples.…”

“…Our measured magnetoresistance values are similar in magnitude to those reported in past studies. 24,25…”