20.500.12556/DiRROS-29742 Chemical ordering and non-linear magnetic behavior enhancing magnetocaloric effect in FeMnNiGeSi high-entropy materials Chemical ordering and non-linear magnetic behavior: enhancing magnetocaloric effect in FeMnNiGeSi high-entropy materials High-entropy alloys (HEAs) offer opportunities to discover new functional materials with combination of properties not reached in other classes of materials. Here we report a detailed investigation of the structure, magnetic and magnetocaloric properties of some high entropy materials in the FeMnNiGeSi quinary system. Our findings indicate the persistence of partial chemical ordering, with transition metal atoms and metalloids preferentially occupying specific crystallographic sites. This ordering is further supported by ab initio total energy calculation. In turn, the magnetic moment - carried out mainly by Fe and Mn - exhibits a strong dependence on the crystallographic sites occupied by these magnetic atoms. By exploring the chemical landscape, we observed highly non-linear magnetic behavior upon Mn doping, resulting in an isothermal entropy change (ΔSm) as high as 35 Jkg−1K−1 in 5 T, while the transition temperature can be tuned in the range from 160 to 263 K, approaching room temperature. These outstanding performances suggest that rare-earth free high entropy materials can rival conventional magnetocaloric materials. Additionally, we find that the first-order magnetostructural transition can evolve into a second-order magnetic transition through chemical tuning. This opens the possibility of discovering similar materials near the boundary between first- and second-order transitions, with vanishing hysteresis - potentially addressing their mechanical instability issue. high-entropy alloys magnetocaloric properties visokoentropijske zlitine magnetokalorične lastnosti true false true Elsevier Nizozemska Angleški jezik Slovenski jezik © 2026 The Authors. Neznano 2026-06-04 11:44:53 2026-06-04 11:44:53 2026-06-05 04:05:57 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Soavtorja iz Slovenije: Sergej Ražnjević, Sašo Šturm; Opis vira z dne 2. 6. 2026; str. 1-12 Vol. 65 Jun. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2026-04-01 2026-04-13 2026-05-21 621.7+621.9 2542-5293 10.1016/j.mtphys.2026.102128 280166915 https://www.sciencedirect.com/science/article/pii/S2542529326001197?via%3Dihub 1 0adbb2e3-5ffa-11f1-9215-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=44697 RAZ_Fournee_Vincent_2026.pdf RAZ_Fournee_Vincent_2026.pdf 1 AFF51DE18B89E814E4BD2C83361074BC 88c52bcf2a750932f6d59513c294d015fbba2711842faff44f7d79dd9b3689af 510d7081-5ffa-11f1-9215-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=44698 Institut Jožef Stefan 0 0 0