Experimental investigation of magnetic properties of MnFeCo$_{4}$Si$_{2}$ discovered by GNoME

Abstract

AI-driven inorganic materials research has garnered significant attention due to its ability to reduce the time, labor, and cost associated with experiments. An AI model known as GNoME, recently developed by Google DeepMind, is particularly fascinating because it is integrated with the Materials Project open database. The experimental verification of compounds identified by GNoME is a crucial process for advancing AI-driven materials research. Here, we focus on the magnetic compound MnFeCo$_{4}$Si$_{2}$ (Materials ID: mp-3203253), which possesses a layered-like structure. Consistent with the GNoME prediction, MnFeCo$_{4}$Si$_{2}$ crystallizes in a rhombohedral structure with a single-phase nature. We have characterized its magnetic properties and determined that MnFeCo$_{4}$Si$_{2}$ is a soft ferromagnet with a Curie temperature of 1039 K.

Figures (6)

• Figure 1: Crystal structure of MnFeCo$_{4}$Si$_{2}$ in hexagonal setting. The solid black lines denote the unit cell.
• Figure 2: XRD pattern of MnFeCo$_{4}$Si$_{2}$. The observed (+) and calculated (solid line) patterns are shown at the top, while the difference between them is displayed at the bottom. Tick marks indicate the positions of Bragg reflections for MnFeCo$_{4}$Si$_{2}$.
• Figure 3: SEM image of MnFeCo$_{4}$Si$_{2}$. The elemental mappings of Mn, Fe, Co, and Si are also shown.
• Figure 4: (a) Temperature dependent $\chi_\mathrm{dc}$ of MnFeCo$_{4}$Si$_{2}$ measured under external field of 100 Oe. The inset shows the temperature derivative of $\chi_\mathrm{dc}$. (b) Temperature dependence of 1/$\chi_\mathrm{dc}$ for MnFeCo$_{4}$Si$_{2}$. The solid line represents the fit according to the Curie-Weiss law.
• Figure 5: (a) Isothermal magnetization curves of MnFeCo$_{4}$Si$_{2}$ measured at 50, 300, 400, 650, 1000, 1039, 1050, and 1095 K. The inset is an expanded view of the low-field region for several curves. (b) Temperature dependence of $M_\mathrm{s}$ and $H_\mathrm{c}$ for MnFeCo$_{4}$Si$_{2}$. The $M_\mathrm{s}$ values were determined from $M$ at 30 kOe for 50 - 400 K and at 6 kOe for 650 - 1095 K.