Hard Magnetic Off‐Stoichiometric (Fe,Sb)2+xHf1−x Intermetallic Phase

By high‐throughput screening the ternary Fe–Hf–Sb system, off‐stoichiometric (Fe,Sb)2+xHf1−x with a composition of Fe60.0–Hf26.5–Sb13.5 with high potential as hard magnetic phase is discovered. By quantitative domain structure analysis, promising intrinsic properties of Js ∼ 1 T, K1 ∼ 1.5 MJ m−3 are found at room temperature. By magnetometry, bulk intrinsic properties of Js ∼ 0.7 T, K1 ∼ 1.4 MJm−3 are found. Alloying elements like Co or Mn turns out to be an effective adjusting screw on the crystal structure and ferromagnetic behavior. The paper deals with a new ternary intermetallic compound composed of Fe, Hf and Sb, which is free of rare earth metals and exhibits promising hard magnetic properties. This compound fills the gap between hard ferrites and high‐quality Nd–Fe–B magnets.