Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 13: Micro- and Nanostructured Magnetic Materials

MA 13.3: Talk

Monday, March 18, 2024, 15:30–15:45, EB 407

Effect of In concentration on structure and magnetism of CoFeMnNi-based alloys prepared by High Εnergy Βall Μilling — •Elisavet Papadopoulou, Ivan Tarasov, Tatiana Smoliarova, Lennart Endler, Benedikt Eggert, Michael Farle, and Natalia Shkodich — Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057 Germany

We report the successful fabrication of ferromagnetic CoFeMnNiInx (x=0; 10; 20; 30 at.%) high entropy alloy microsized particles by short-term (60 min) high energy ball milling (HEBM) in Ar at 700/1400 rpm. The SEM/EDX and TEM/EDX analyses of all HEBM compositions showed the homogeneous distribution of the principal elements. A nanocrystalline soft magnetic single fcc CoFeMnNi alloy produced by HEBM exhibits a saturation magnetization Ms (310 K) of 46.5 Am2/kg, which is 2.5 times higher than those reported in [1]. The addition of 10 at.% of In leads to an enhancement of Ms by 16 % and an increase in coercivity Hc up to 21.7 kA/m (by 58 times). Fast annealing (30 s) at 950 K for the quaternary alloy leads to a drastic decrease of Ms to 13.44 Am2/kg, while for CoFeMnNiIn10 MS is doubled (112 Am2/kg, twice the one of Ni), which is ~ 10 times higher than for the quaternary In-free alloy. We acknowledge financial support from DFG (CRC/TRR 270 (project ID 405553726), projects Α04, A03 & B05). [1] Hariharan, V.S., Karati, A., Parida, T. et al. J Mater Sci 55, 17204-17217 (2020).