The magnetic properties of MMCo5 (MM=Mischmetal) nanoflakes prepared by multistep (three steps) surfactant-assisted ball milling

摘要

The hard magnetic MMCo₅ nanoflakes with high coercivity and narrow size distribution have been successfully obtained by three steps surfactant-assisted ball milling (SABM). The magnetic properties, phase structure and morphology of these MMCo₅ nanoflakes were studied in this work. The coercivity and the remanence ratio of MMCo₅ nanoflakes reached to 5.89 kOe and 0.75, respectively. The X-ray powder diffraction (XRD) patterns indicated that the MMCo₅ nanoflakes were CaCu₅-type hexagonal crystal structure. The average thickness, in-plane size and aspect ratio reached to 20 nm, 0.9 μ m and 60, respectively. The low cost and great properties of MMCo₅ nanoflakes with a centralized thickness distribution could be the building blocks for the future high-performance nanocomposite permanent magnets with an enhanced energy product.