High-entropy nanoalloys anchored on entropy-compensating two-dimensional oxides for enhanced nanomagnetism.

Abstract

Mitigating detrimental surface effects in nanometals is crucial for advancing applications in quantum magnetic storage and integrated circuits, as size reduction often experiences atomic distortion and vacancy formation, disrupting magnetic domains and electronic transport. Herein, we synthesize nano-high-entropy alloys (HEAs) anchored on two-dimensional high-entropy oxide nanosheets. By leveraging interfacial entropy compensation and the high-entropy effect, the triggered atomic rearrangements alleviate the inhomogeneous stress distribution in magnetic nanoparticles by mitigating unsaturated coordination and surface defects and reinforcing internal distortion, thereby suppressing surface effects. The anchored HEAs demonstrate stable sub-20-nanometer vortex magnetic domains, achieving an 80% enhancement in saturation magnetization and a 135% improvement in permeability, surpassing isolated HEAs and conventional ferromagnetic metals. Moreover, this enhancement enables more than 50% absorption efficiency across the wireless communication spectrum (3.3 to 6.0 gigahertz) with superior thermal stability (300 to 800 kelvins). This study establishes a pathway to enhance nanometal magnetoelectric properties for flexible, high-performance electromagnetic devices.