Chemically synthesized anisotropic SmCo5 nanomagnets with a large energy product

Abstract

In this communication, we report a facile strategy to chemically synthesize anisotropic SmCo₅ nanomagnets with a large magnetic energy product (BH). First, we designed a Co₃O₄@Sm₂O₃–CaO precursor by a one-pot method, which could be further reduced into uniform single-crystal SmCo₅ particles under the stabilization of CaO coating. Following that, CaO was removed under an oxygen-free environment to impede oxidation. Finally, 130 ± 10 nm SmCo₅ particles were aligned to be nanomagnet, exhibiting a large (BH)_max value of 18.1 MGOe, which is the highest value reported by chemical methods.