New soft magnetic materials ([formula omitted])[formula omitted]B with tunable magnetic anisotropy

Abstract

Soft magnetic materials play important roles in both power generation and conversion devices with the rapid development of power semiconductors, however, finding new soft magnetic materials is an urgent problem. It was found that (Y1−xSmx)2Fe14B (0≤x≤1) compounds prepared by vacuum induction melting have a tetragonal structure. In (0≤x≤1) range, the saturation magnetization is higher than 110 A⋅m2/kg, the Curie temperature is over 290 °C, the coercivity and the remanence are less than 5729.8 A⋅m−1 and 7 A⋅m2/kg, respectively. Furthermore, with increasing x the directions of easy magnetization change from the c-axis (x=0.00) to the cone plane (x=0.15), and then to the ab-plane (x≥0.30). For x=0.15 compound, the permeability at 100 kHz is 11.8, that is beyond all of existing rare earth magnetic materials. These indicate that (Y1−xSmx)2Fe14B compounds are the promising candidate for proper soft magnetic materials without x=0. Our work extends the function of rare earth transition metal intermetallic compounds, which open a new way to find advanced soft magnetic materials.