Abstract
Cr and Mn play intriguing roles in determining the magnetic properties of CoFeNi-based high-entropy alloys (HEA). In this study, we tune the stoichiometric Mn composition to systematically explore the magnetic properties of (CoCrFeNi)1−xMnx HEAs. We observe a change from ferro-to ferrimagnetism due to the incorporation of Mn atoms into the CoCrFeNi HEA. In addition, we measure an 81% reduction in magnetization with the incorporation of 7.6 (2)% Mn atoms. Such a significant reduction in magnetization cannot be solely explained by the effect of the inversed moments on the Mn atoms. Hence, we propose a mechanism whereby the Mn atoms flip the moments of neighboring atoms, which results in the magnetization reduction observed in the CoFeNi-based HEAs.
Highlights
High-entropy alloys (HEA) are promising for their potential and their possible applications (George et al, 2019)
The effective moment is less than the calculated average spin-only value of 4.38 μB found among Co, Cr, Fe, and Ni based on the equimolar composition (3.87 μB/Co, 5.92 μB/Cr, 4.90 μB/Fe, and 2.83 μB/Ni)
Namely 1) the existence of the antiparallel moments and 2) the ferromagnetic-like transition temperatures, we propose the occurrence of ferrimagnetism in (CoCrFeNi)1−xMnx HEA
Summary
High-entropy alloys (HEA) are promising for their potential and their possible applications (George et al, 2019). Among the studies on HEAs (Yeh et al, 2004; Otto et al, 2013; Gludovatz et al, 2014; Cong et al, 2016; Ye et al, 2016), research into their magnetic properties is challenging because the geometry of HEAs, whether in bulk, powder, or thin-film forms, can change their magnetic performance, even when the stoichiometries of the HEA composition are identical (Huang et al, 2020) Regardless, owing to their good mechanical performance (Otto et al, 2013; Gludovatz et al, 2014), magnetic applications of HEAs are hotly anticipated (Koželj et al, 2019; Huang et al, 2020; Chaudhary et al, 2021; Na et al, 2021). HEAs can have tunable hard magnetism, which can be realized by making minor changes to the stoichiometry of the elements (Na et al, 2021)
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