Anisotropic Nd2Fe14B nanoparticles and nanoflakes by surfactant-assisted ball milling

Abstract

Magnetic and dielectric properties of sol-gel derived nanoparticles of double perovskite Y2NiMnO6 J. Appl. Phys. 112, 044311 (2012) Universal ultrafast sandpaper assisting rubbing method for room temperature fabrication of two-dimensional nanosheets directly on flexible polymer substrate Appl. Phys. Lett. 101, 073113 (2012) Size and alloying induced changes in lattice constant, core, and valance band binding energy in Pd-Ag, Pd, and Ag nanoparticles: Effect of in-flight sintering temperature J. Appl. Phys. 112, 014307 (2012) Size dependent melting behaviors of nanocrystalline in particles embedded in amorphous matrix J. Appl. Phys. 111, 043515 (2012) Stretch-induced plasmonic anisotropy of self-assembled gold nanoparticle mats Appl. Phys. Lett. 100, 073101 (2012) Additional information on J. Appl. Phys.

Prospects for nanoparticle-based permanent magnets

“…The conventional ball-milling process, in which bulk alloys are ground to fine powders using a grinding medium such as ceramic or stainlesssteel balls, reduces the grain size only to ~30 nm [13,14]. The ball milling of rare-earth alloys such as Nd-Fe-B or Sm-Co in a liquid medium (heptane) as well as in the presence of stabilizing agents such as oleic acid or oleylamine, however, can reduce the particle size to 5 nm [35][36][37][38][39]. Interestingly, these nanoparticles deposited on substrates such as carbon-coated Cu grids also show self-assembly, presumably caused by the presence of the surfactants [38].…”

Generation and Characterization of Anisotropic Microstructures in Rare Earth-Iron-Boron Alloys

“…A more recent method of inducing texture through a process known as surfactant-assisted ball milling has been attempted by several groups [49][50][51][52][53]. In this process, isotropic (or large-grained) particulate, milling balls, and an organic surfactant (often oleic acid) is placed within a ball mill jar and high energy ball-milled.…”

“…However, a challenge still exists to successfully create these in an anisotropic form. Attempts at die-upset [66,67], thick film synthesis [68], chemical deposition [69], hot extrusion [70], and surfactant-assisted high energy ball milling [50] have all been attempted with very limited success. In each case, either the spacing is insufficiently small or the processing route is no longer viable with the alloy.…”

Crystal structure and magnetic properties of (Nd,Tb)2Fe14B nanoflakes prepared by surfactant-assisted ball milling

“…[5][6][7] Up to now, remarkable progress has been reported in preparation of Nd 2 Fe 14 B based nanoparticles and nanoflakes with low coercivity not more than 2 kOe. 1,5,8 For comparison, the as-prepared Tb 2 Fe 14 B based nanoparticles and nanoflakes possess high room temperature coercivity more than 20 kOe and strong magnetic anisotropy. 9 Tb 2 Fe 14 B possesses magnetic anisotropy field (H A ) of 22 T at room temperature, which is the higher value than that of the Nd 2 Fe 14 B (6.7 T) compounds.…”

“…[1][2][3][4] A variety of rare earth (RE)-transition metal (TM) nanoparticles and nanoflakes with high aspect-ratio were prepared by a surfactant-assisted ball milling (SABM) method. [5][6][7] Up to now, remarkable progress has been reported in preparation of Nd 2 Fe 14 B based nanoparticles and nanoflakes with low coercivity not more than 2 kOe.…”