Interstitial nitrogen-modified (Y1−<i>x</i>Sm<i>x</i>)2Fe14BN<i>y</i> compounds toward enhanced operating frequency and reduced power loss

Abstract

Soft magnetic materials with high operating frequency and low power loss are crucial for electricity transmission and utilization. However, finding an effective method to improve the operating frequency while minimizing power loss in these materials remains a significant challenge. Herein, we synthesized the (Y1−xSmx)2Fe14B (0≤x≤1) compounds and introduced nitrogen atoms into their interstitial crystal sites via the gas–solid reaction, remarkably improving their operating frequency and reducing power loss. For the compounds with x = 0.15, the operating frequency increased from 1.7 to 5.5 MHz, with the imaginary part of relative permeability decreased from 6.1 to 1.6. The power loss decreased from 1607.7 to 664.1kW/m3, and loss separation indicated that eddy current loss Peddy was significantly suppressed by nitriding from 1397.7 to 547.9kW/m3. The conductivity decreased by approximately 43% by nitriding, from 9380.9 to 5359.0 S/m. These results demonstrate that tuning power loss through nitrogenation of rare-earth transition metal intermetallic compounds is an effective method for developing new high-frequency and low power loss soft magnetic materials.