Large anomalous transverse transport properties in atomically thin 2D Fe3GaTe2

Abstract

Anomalous transverse conductivities, such as anomalous Hall conductivity (AHC), anomalous Nernst conductivity (ANC), and anomalous thermal Hall conductivity (ATHC), play a crucial role in the emerging field of spintronics. Motivated by the recent fabrication of two-dimensional (2D) ferromagnetic thin film Fe3GaTe2, we investigate the thickness-dependent anomalous transverse conductivities of the 2D Fe3GaTe2 system (from one to four layers). The atomically ultrathin 2D Fe3GaTe2 system shows above-room-temperature ferromagnetism with a large perpendicular magnetic anisotropy energy. Furthermore, we obtain a large AHC of −485 S/cm in the four-layer thickness, and this is further enhanced to −550 S/cm with small electron doping. This AHC is seven times larger than the measured AHC in thicker 2D Fe3GaTe2 (178 nm). The ANC also reaches 0.55 A/K.m in the four-layer structure. Along with these, the four-layer system exhibits a large ATHC (−0.105 ~ −0.135 W/K.m). This ATHC is comparable to the large ATHC found in Weyl semimetal Co3Sn2S2. Based on our results, the atomically ultrathin 2D Fe3GaTe2 system shows outstanding anomalous transverse conductivities and can be utilized as a potential platform for future spintronics and spin caloritronic device applications. Two-dimensional materials have become popular in science due to their unique characteristics and potential for new technologies. In this study, researchers examined a specific 2D material, Fe3GaTe2, which has shown potential due to its strong magnetism at high temperatures, making it suitable for spintronics devices that operate at room temperature or above. The team performed calculations to investigate how the thickness of Fe3GaTe2 layers impacts their magnetic and anomalous transport properties. In conclusion, the study showed that adding more layers to the Fe3GaTe2 single layer improves its anomalous transverse conductivities, which could lead to better performance in future spintronic devices. The findings suggest that ultra-thin layers of this material could be very useful in the field of spintronics, potentially leading to more efficient and powerful technology. This summary was initially drafted using artificial intelligence, then revised and fact-checked by the author. We investigate the anomalous transverse conductivities of a two-dimensional (2D) magnetic Fe3GaTe2 system (monolayer to four-layer thickness). A giant anomalous thermal Hall conductivity (ATHC) of -0.14 W/K.m is obtained in the four-layer structure, and this value is comparable to the typical ATHC found in bulk materials which is rare to find in low-dimensional systems. Our findings suggest that the ultra-thin 2D Fe3GaTe2 system could be a promising platform for future spintronics and spin caloritronics device applications.