TY  - JOUR
AU  - Lan, Qianqian
AU  - Kovács, András
AU  - Caron, Jan
AU  - Du, Hongchu
AU  - Song, Dongsheng
AU  - Dasari, Sriswaroop
AU  - Gwalani, Bharat
AU  - Chaudhary, Varun
AU  - Ramanujan, Raju V.
AU  - Banerjee, Rajarshi
AU  - Dunin-Borkowski, Rafal E.
TI  - Highly complex magnetic behavior resulting from hierarchical phase separation in AlCo(Cr)FeNi high-entropy alloys
JO  - iScience
VL  - 25
IS  - 4
SN  - 2589-0042
CY  - St. Louis
PB  - Elsevier
M1  - FZJ-2022-02044
SP  - 104047 -
PY  - 2022
AB  - Magnetic high-entropy alloys (HEAs) are a new category of high-performance magnetic materials, with multicomponent concentrated compositions and complex multi-phase structures. Although there have been numerous reports of their interesting magnetic properties, there is very limited understanding about the interplay between their hierarchical multi-phase structures and the resulting magnetic behavior. We reveal for the first time the influence of a hierarchically decomposed B2 + A2 structure in an AlCo0.5Cr0.5FeNi HEA on the formation of magnetic vortex states within individual A2 (disordered BCC) precipitates, which are distributed in an ordered B2 matrix that is weakly ferromagnetic. Non-magnetic or weakly ferromagnetic B2 precipitates in large magnetic domains of the A2 phase, and strongly magnetic Fe-Co-rich interphase A2 regions, are also observed. These results provide important insight into the origin of coercivity in this HEA, which can be attributed to a complex magnetization process that includes the successive reversal of magnetic vortices.
LB  - PUB:(DE-HGF)16
C6  - 35359811
UR  - <Go to ISI:>//WOS:000819870200005
DO  - DOI:10.1016/j.isci.2022.104047
UR  - https://juser.fz-juelich.de/record/907452
ER  -