High Electrical Resistivity Sm(Co,Fe,Cu,Zr) $_{\rm z}$ /Sm $_{2}$ S

High electrical resistivity, sintered Sm(Co,Fe,Cu,Zr)_z/Sm₂S₃ layered composite permanent magnets were fabricated by a one-step sintering process. The thickness of the Sm₂S₃ layers was uniform in various laminated magnet architectures and controlled between 50 and 200 μm. The dielectric Sm₂S₃ layer provides an enhanced electrical resistivity while the existence of an interface diffusion reaction layer between the magnet matrix and dielectric component may help to improve the mechanical properties of the laminated magnet. The Sm(Co,Fe,Cu,Zr)_z/Sm₂S₃ magnets exhibited nearly the same magnetic properties and demagnetization curve shape as the standard non-laminated counterparts, with only a small dilution of the magnetization. These sequentially laminated Sm(Co,Fe,Cu,Zr)_z/Sm₂S₃ magnets showed about 30 times higher electrical resistivity and good mechanical strength combined with excellent magnetic properties. The laminated Sm(Co,Fe,Cu,Zr)_z magnet with 190 μ m Sm₂ S₃ layer thickness exhibited a remanent magnetization (B_r) of 10.51 kG, an intrinsic coercivity H_ci of >; 24.5 kOe and a maximum energy product of 25 MGOe.