Investigating Complex Magnetic Ordering in Pt doped Mn3Ga — 48p — Mason Pulse, Alec Venner, Mohd Anas, and Parashu Kharel  

Department of Chemistry, Biochemistry and Physics, South Dakota State University

Heusler alloys are of high research interest due to their potential in functional applications. Mn₃Ga is a Heusler alloy with intriguing magnetic and electron transport properties that make it useful in spintronic applications. This study investigates the impact Pt doping has on the magnetic and structural properties of Mn₃Ga. Since Mn₃Ga shows complex structural and magnetic properties, introducing a heavy element such as Pt into its lattice by replacing a small fraction of Mn can foster quantum properties. Mn₃Ga and Mn_2.75Pt_0.25Ga were prepared by arc melting and annealing at 525 ˚C for 24 hours. Magnetic properties were assessed using a magnetometer, while the structural properties were determined through x-ray diffraction,  for both as prepared and annealed samples. Mn₃Ga shows complex magnetic properties when heated from room temperature to 900 K. The as-prepared Mn_2.75Pt_0.25Ga crystallizes in a cubic phase which shows  antiferromagnetic properties at room temperature. When annealed, Mn_2.75Pt_0.25Ga shows some structural  change exhibiting ferrimagnetic properties. The results of this study are important for understanding the  properties of Mn₃Ga and the effect of Pt doping on it.

This research is supported by the National Science Foundation (NSF) under Grant Numbers  2003828 and 2003856 via DMR and EPSCoR, and the department of Chemistry, Biochemistry, and  Physics. Mohd Anas is supported by U.S. Department of Energy (DOE) Established Program to  Stimulate Competitive Research (EPSCoR) grant no. DE-SC0024284.

South Dakota State University
Parashu Kharel