Complex magnetism of single-crystalline AlCoCrFeNi nanostructured high-entropy alloyKoželj, Primož (Avtor) Jelen, Andreja (Avtor) Dražić, Goran (Avtor) Vrtnik, Stanislav (Avtor) Luzar, Jože (Avtor) Wencka, Magdalena (Avtor) Meden, Anton (Avtor) Feuerbacher, Michael (Avtor) Dolinšek, Janez (Avtor) complex magnetismhigh-entropy alloysnanostructured alloysWe have investigated magnetism of the Al28Co20Cr11Fe15Ni26 single-crystalline high-entropy alloy. The material is nanostructured, composed of a B2 matrix with dispersed spherical-like A2 nanoparticles of average diameter 64 nm. The magnetism was studied from 2 to 400 K via direct-current magnetization, hysteresis curves, alternating-current magnetic susceptibility, and thermoremanent magnetization time decay, to determine the magnetic state that develops in this highly structurally and chemically inhomogeneous material. The results reveal that the Cr-free B2 matrix of composition Al28Co25Fe15Ni32 forms a disordered ferromagnetic (FM) state that undergoes an FM transition at 390 K. The Al- and Ni-free A2 nanoparticles of average composition Co19Cr56Fe25 adopt a core-shell structure, where the shells of about 2 nm thickness are CoFe enriched. While the shells are FM, the nanoparticle cores are asperomagnetic, classifying into the broad class of spin glasses. Asperomagnetism develops below 15 K and exhibits broken-ergodicity phenomena, typical of magnetically frustrated systems.Elsevier20232026-04-13 08:40:32Neznano28894UDK: 537ISSN pri članku: 2589-0042DOI: 10.1016/j.isci.2023.106894COBISS_ID: 153712387Nizozemskasl©2023 The Author(s).