A Quaternary van der Waals Ferromagnetic Semiconductor AgVP₂Se₆

Abstract

The recent realization of two-dimensional (2D) magnetism in van der Waals (vdWs) magnets holds the promise for future information technology. However, the vdWs semiconducting ferromagnets, which remain rare, are especially important in developing 2D magnetic devices with new functionalities due to the possibility of simultaneous control of the carrier charge and spin.Metal thiophosphate (MTP), a multifunctional vdWs material system that combines the sought-after properties of complex oxides, is a promising vdWs magnet system. Here, we successfully synthesized single crystals of a novel vdWs ferromagnetic semiconductor MTP AgVP 2 Se 6 with resistivity of 1 Ω•m at room temperature. Due to the nature of vdWs bonding along the c axis, the magnetic properties of the few-layer AgVP 2 Se 6 with different thicknesses are characterized on the exfoliated samples.The AgVP 2 Se 6 flakes exhibit significant thickness-dependent magnetic properties, and a rectangular hysteresis loop with a large coercive field of 750 Oe at 2 K and an undiminished Curie temperature of 19 K are observed in the 6.7 nm AgVP 2 Se 6 flake. The discovered vdWs ferromagnet AgVP 2 Se 6 with semiconducting behavior will provide alternative platforms for exploring 2D magnetism and potential applications in spintronic devices.

Highly‐Tunable Intrinsic Room‐Temperature Ferromagnetism in 2D van der Waals Semiconductor CrxGa1−xTe

“…The larger suppression of M sat in the Cr 0.024 Ga 0.976 Te thin nanosheets at 300 K (Figure 3h ) is attributed to the large influence of thermal fluctuations in the 2D ferromagnetic system [ 11 ] and the reduction of T C . [ 32 ] Similar with other vdW ferromagnetic crystals, [ 33 , 34 , 35 ] the H C of Cr 0.024 Ga 0.976 Te nanosheets exhibit an enhancement up to ≈4.1 times than bulk counterpart at 3 K, as shown in Figure 3i (and Table S2 , Supporting Information). Furthermore, the magnetizations for both the Cr 0.024 Ga 0.976 Te bulk and the ultrathin nanosheets (NSs‐300) show in‐plane easy magnetization direction at 300 K (Figure S12a,b , Supporting Information).…”

Anomalous thickness dependence of Curie temperature in air-stable two-dimensional ferromagnetic 1T-CrTe2 grown by chemical vapor deposition

“…Noting that no obvious defects or stacking faults were observed from the STEM results and no step-like feature was founded in the thin samples. In this work, we infer that the additional minor step-like feature at low field may come from a complex magnetic domain structure 37 . In the thin sample ( d ~ 3.0 nm), a prominent hysteresis loop is observed under the magnetic field parallel to the c -axis (Fig.…”

“…11 and 12 ). The T c was extracted from the inflection point defined by the minimum of dM/dT in the M–T curve 37 . The increase of T c from 179 to 189 K under an out-of-plane magnetic field is observed with reduced thickness from ~40.0 to ~3.0 nm, as further confirmed by magneto-transport and RMCD measurements, which is considered as a non-destructive and effective technique for probing the 2D magnetism 2 , 8 , 9 .…”

Recent Advances in 2D Layered Phosphorous Compounds

“…[ 19,33,34 ] In recent years, 2D magnetic and ferroelectric materials have become research hotspots due to their application in spintronic devices and nonvolatile memories. [ 35–38 ] Encouragingly, some of 2D LPCs (such as FePS 3 , NiPS 3 , MnPS 3 , CuInP 2 S 6 , etc.) have been experimentally proven to exhibit inherent magnetic and ferroelectric properties at atomic scale.…”