Substrate-modulated ferromagnetism of two-dimensional Fe3GeTe2

Abstract

We systematically investigated the modulation effects of substrates on the ferromagnetism properties of Fe3GeTe2 experimentally and theoretically. The polar refractive magnetic circular dichroism results demonstrate that the ferromagnetism could be modulated significantly by selecting different substrates. We explain this phenomenon using the first-principles calculation, revealing that it was induced by the lattice distortion and charge redistribution between the interfaces. Our work is useful to understand the fundamental mechanism of tunable ferromagnetism and paves the way for exploring interface physics and practical spintronic applications of two-dimensional ferromagnetic van der Waals crystals.

Elusive Dzyaloshinskii-Moriya interaction in monolayer Fe3GeTe2

“…Introduction -Magnetism in low dimensions has received renewed interest in the past few years with the experimental observation of remnant magnetization in two-dimensional van der Waals materials such as CrI 3 1 , VTe 2 3 , CrTe 2 4 , and Fe 3 GeTe 2 5 . The emergence of robust magnetic order at room temperature is appealing for spintronics applications, and among the ever-increasing family of candidate materials Fe 3 GeTe 2 stands out as a solid paradigm 5,7,8 . As a matter of fact, this material hosts interesting promises: spin-orbit torque 9,10 and anomalous Nernst effect 11,12 have been observed in bilayer heterostructures, and magnetoresistance has been reported in spin-valves 13,14 .…”

Recent Advances in 2D Group VB Transition Metal Chalcogenides

“…The M S of VTe 2 is 0.21 emu g −1 (@300 K) and the M-H curve of NbTe 2 also shows a weak ferromagnetic signal at 300 K. [71] Substrates and surface modifications have a critical influence on the magnetism of 2D materials. [24,72,73] Batzill and co-workers found that the magnetization of 2D VSe 2 grown on the MoS 2 substrate is strongly enhanced compared with that on the highly oriented pyrolytic graphite substrate, suggesting the stronger magnetic coupling between VSe 2 and MoS 2 , as shown in Figure 4d,e. [24] Besides, they also found that the M S of VSe 2 nanosheets drastically decreases with the increasing layer number (Figure 4f), which is due to the coupling between magnetism and CDW.…”

Air‐Stable 2D Intrinsic Ferromagnetic Ta3FeS6 with Four Months Durability

“…To rule out the possible contribution of Kerr signal by Au residues, the MOKE measurement was performed on bare Au film under the same condition and no obvious MOKE signal was observed ( Figure S5, Supporting Information). [44][45][46] Significantly, the magnetic hysteresis loop with a sharp switching edge demonstrated that the Ta 3 FeS 6 nanosheet was ferromagnetic ordering with strong out-of-plane spin polarization. [47] Previous theoretical calculation demonstrates that the local moments at Fe atoms induces a magnetic polarization of the Ta 5d Z 2 band, and the direction of polarization was parallel arranged along the c axis in the Ta 3 FeS 6 structure, which agreed well with our experiment result.…”