Physical property of highly ordered high entropy alloy film by van der Waals epitaxy

Jia-Wei Chen^1*, Ying-Hao Chu¹

¹Departments of materials science and engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan

* Presenter:Jia-Wei Chen, email:will120233@gmail.com

High entropy alloys (HEAs), which was predicted to be a next generation alloy with high mechanical strength, have been fabricated successfully and developed rapidly. Researchers dedicated their efforts to quest the interesting system and try to figure all the secrets behind them. When we say “high entropy”, we see the system as a long-range disorder state. Further, “epitaxial” means that a material is single-crystal like and highly ordering. In this study we successfully fabricated an epitaxial HEA films by sputtering it on single crystal mica substrate. Because the weak van der Waals’ force was provided on the mica surface, mica can be a good platform for epitaxial growth by avoiding the lattice mismatch. And we explore how the long term ordered structure affect the physical property with several ways. By vibration sample magnetometer, we can see the epitaxial system perform weak magnetization at room temperature. The electric property is evidenced by the physical property measurement system, it shows that the epitaxial system has fewer scattering for electron at low temperature. And the anomalous hall conductivity is higher in the amorphous film. Combined all the information mentioned above, we provide a new assumption that the HEA will be changed the physical property when the atomic arrangement turns to be highly ordered

Keywords: High entropy alloy, Magnetism, Epitaxy