It is observed a turning point in the particle size for which the coercivity Hci of a Sm-Co alloy reaches a peak. Using a broad size range from 20 nm to 5 mm, the turning point of the flake thickness for SmCo5 nanoflakes is determined in the range of 100–180 nm with Hci peak at ∼20 kOe. A lower coercivity at a particle size well below the turning point is likely related to a more detailed nanoscale morphology that controls coercivity. The effect of particle size on crystallinity for high energy milled powder is also discussed with four observations.
Articles you may be interested inMagnetic texture and coercivity of anisotropic nanocrystalline SmCo6.1Si0.9 magnets J. Appl. Phys. 115, 17A701 (2014); 10.1063/1.4860658 Effect of milling parameters on SmCo5 nanoflakes prepared by surfactant-assisted high energy ball milling J. Appl. Phys. 113, 013913 (2013); 10.1063/1.4773323Effect of surfactant molecular weight on particle morphology of SmCo5 prepared by high energy ball milling Influence of the type of surfactant and hot compaction on the magnetic properties of SmCo5 nanoflakesEstablishing an effective process to synthesize anisotropic magnetic nanopowders that have both high energy products and high coercivity is highly desirable for many applications. A recent effort using surfactant-assisted high energy milling is proved to be capable of making SmCo 5 nanoflakes/ submicron-flakes with high performance. Using the cast alloy as a starting powder, a series of the flakes with various thicknesses were made, which had energy product values up to 22 MGOe and coercivity values up to 21 kOe. The highest coercivity corresponds to a typical flake thickness of 180 nm. The key to our technique is retaining the crystallinity, which allows a high degree of anisotropy to be produced. Results of the analyses from the micrograph of SEM, XRD patterns, and magnetic measurements demonstrate the effect of flake thickness on the magnetic properties. More importantly, a relationship of property-morphology correlation in nanoscale is established for rare earth magnetic powder/flakes.
Magnetic texture and coercivity of anisotropic nanocrystalline SmCo6.1Si0.9 magnets J. Appl. Phys. 115, 17A701 (2014); 10.1063/1.4860658Effect of milling parameters on SmCo5 nanoflakes prepared by surfactant-assisted high energy ball milling Effects of particle size and composition on coercivity of Sm-Co nanoparticles prepared by surfactant-assisted ball milling
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