AUTHOR=Lee Chi-Hung , Chin Hsu-Hsuan , Zeng Kun-Yuan , Chang Yao-Jen , Yeh An-Chou , Yeh Jien-Wei , Lin Su-Jien , Wang Chun-Chieh , Glatzel Uwe , Huang E-Wen 

TITLE=Tailoring Ferrimagnetic Transition Temperatures, Coercivity Fields, and Saturation Magnetization by Modulating Mn Concentration in (CoCrFeNi)1−xMnx High-Entropy Alloys

JOURNAL=Frontiers in Materials

VOLUME=9

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.824285

DOI=10.3389/fmats.2022.824285

ISSN=2296-8016

ABSTRACT=<p>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)<sub>1−<italic>x</italic></sub>Mn<sub><italic>x</italic></sub> 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.</p>