The effect of flake thickness on anisotropic SmCo5 nanoflakes/submicron-flakes with high energy product

Abstract

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.

Morphology and magnetic properties of CeCo5 submicron flakes prepared by surfactant-assisted high-energy ball milling

“…Without surfactant, the produced particles are isotropic microparticles with equiaxed shape. Surfactants play an important role in the formation of such high aspect ratio submicron flakes [5][6][7][8][9][10][11][12][13]. Well dispersive and magnetically anisotropic particles could be aligned by magnetic fields and could be used to prepared anisotropic bonded magnets.…”

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

“…Recently, crystallographically textured SmCo 5 and SmCo 7 nanoflakes were prepared by surfactant-assisted high energy ball milling (HEBM). [8][9][10] The SmCo 5 nanoflakes have attractive magnetic properties; coercivity of up to 21 kOe and maximum energy product of up to 22 MGOe. 9 Thus, the nanoflake powders possess a potential to fabricate anisotropic nanocrystalline SmCo 5 bulk magnets with higher magnetization and higher coercivity.…”

“…[8][9][10] The SmCo 5 nanoflakes have attractive magnetic properties; coercivity of up to 21 kOe and maximum energy product of up to 22 MGOe. 9 Thus, the nanoflake powders possess a potential to fabricate anisotropic nanocrystalline SmCo 5 bulk magnets with higher magnetization and higher coercivity. Anisotropic nanocrystalline SmCo 7 bulk magnets created from nanoflake powders via spark plasma sintering technique were investigated by several researchers.…”

Effect of surfactant molecular weight on particle morphology of SmCo5 prepared by high energy ball milling

“…7,8 Oleic acid (OA) is the most commonly utilized surfactant reported in literature for the preparation of SmCo 5 nanoflakes. [5][6][7]9 Interaction of OA acid with SmCo 5 occurs through the formation of a carboxylate bond between the carboxylic acid head of the surfactant and the metallic SmCo 5 surface (inset Fig. 1).…”