Anisotropic Sm2Co17 flakes with high aspect ratio were prepared by magnetic field assisted high energy ball milling in the presence of heptane and oleic acid(OA).The thickness of flakes was only tens of nanometers.Coercivity of 3 kOe was achieved in the nano-flakes.Most interestingly,the magnetic crystalline anisotropy of Sm2Co17 flakes was improved compared to that of particles made by traditional ball milling.These anisotropic Sm2Co17 nano-flakes could be the building blocks for the future high-performance nano-composite permanent magnets with an enhanced energy product.
A new preparation method of Sm2Co17nanoflakes was investigated.Hard magnetic Sm2Co17nanoflakes with thickness of 20-100nm were obtained by milling in heptane and oleic acid under a magnetic field of 1.5Tfor0.5-20h.It was shown that higher anisotropic magnetic properties would be induced by the flake-shape anisotropy when the prepared Sm2Co17particles are milled with a magnetic field.The magnetic anisotropy of flakes after being aligned under the magnetic field of 1.5Tcould be further enhanced,and the value of(BH)m was 128kJ·m-3.Both anisotropyand properties are better than those of the nano-particles milled without a magnetic field.
