High easy-plane anisotropy Y-Co intermetallic nanoparticles for boosting gigahertz magnetic loss ability

Abstract

Soft magnetic materials with ferromagnetic loss abilities have been proven effective in solving gigahertz electromagnetic problems. However, it remains a challenge to synergistically improve their loss capacities and working frequencies due to the Snoek limit. Here, we proposed Y-Co nanoparticles with optimized magnetic anisotropy to break this limit and boost microwave absorption properties. As a result, the soft magnetic phases have manipulated the ferromagnetic loss ability, resulting in the improvement of the easy-plane anisotropy, thus increasing the resonance frequency. A loss peak at 6.2 GHz with a loss capacity (μ") of 0.74 can be found in soft magnetic phase-rich nanoparticles with easy-plane anisotropy, which is higher than that of hard magnetic phase-rich with easy-axis anisotropy (0.76, 4.3 GHz) and Co phase (0.4, 3.95 GHz) nanoparticles. The minimum reflection loss of it can reach −26.4 dB (6.85 GHz) with a broad effective absorption bandwidth of 4.35 GHz (5.85 ∼ 10.20 GHz). The present study provides intrinsic insight into the relationship between easy-plane anisotropy and magnetic loss ability, inspiring the design of high-frequency electromagnetic compatibility materials.