Strategy‐Induced Strong Exchange Interaction for Enhancing High‐Temperature Magnetic Loss in High‐Entropy Alloy Powders DOI

Zerui Li,

Yuping Duan, Xiaoji Liu

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 15, 2025

Abstract Magnetic loss in high‐temperature microwave absorbers typically decreases sharply with rising temperature, limited by the Curie temperature ( T C ) . Conventional alloys rely on high‐proportion additions of magnetic metals to enhance ; however, this approach increases electrical conductivity and causes impedance mismatch under high temperatures. In study, a synergistic strategy for high‐entropy alloy (HEA) powders is presented that reduces reliance metal content. This involves formation element‐rich nanoparticles (MENPs) incorporation rare‐earth element Gd, which effectively stabilizes ferromagnetic ordering at The FeCoCrAlGd 0.2 HEA exhibits 947 °C retains saturation magnetization 102 emu g −1 from room up 700 °C. These intrinsic properties enable stable moment precession electromagnetic fields. Notably, demonstrates significant even 400 Density functional theory (DFT) calculations indicate 3d 4f electron bands MENPs are closely aligned energy levels, inducing strong exchange interactions thermally MENPs. work presents novel design research HEAs, identifying promising material absorbers.

Language: Английский

Strategy‐Induced Strong Exchange Interaction for Enhancing High‐Temperature Magnetic Loss in High‐Entropy Alloy Powders DOI

Zerui Li,

Yuping Duan, Xiaoji Liu

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 15, 2025

Abstract Magnetic loss in high‐temperature microwave absorbers typically decreases sharply with rising temperature, limited by the Curie temperature ( T C ) . Conventional alloys rely on high‐proportion additions of magnetic metals to enhance ; however, this approach increases electrical conductivity and causes impedance mismatch under high temperatures. In study, a synergistic strategy for high‐entropy alloy (HEA) powders is presented that reduces reliance metal content. This involves formation element‐rich nanoparticles (MENPs) incorporation rare‐earth element Gd, which effectively stabilizes ferromagnetic ordering at The FeCoCrAlGd 0.2 HEA exhibits 947 °C retains saturation magnetization 102 emu g −1 from room up 700 °C. These intrinsic properties enable stable moment precession electromagnetic fields. Notably, demonstrates significant even 400 Density functional theory (DFT) calculations indicate 3d 4f electron bands MENPs are closely aligned energy levels, inducing strong exchange interactions thermally MENPs. work presents novel design research HEAs, identifying promising material absorbers.

Language: Английский

Citations

0