Chemical synthesis of narrowly dispersed SmCo5 nanoparticles
Abstract
In this article we report a chemical synthetic means for generating a high Ku magnetic material—narrowly dispersed nanoparticles of SmCo5. Using Co2(CO)8 and Sm(acac)3 as the precursors under air-free conditions, we produced SmCo5 nanoparticles according to the procedure reported by Sun et al. [Science 287, 1981 (2000)] but with some modifications. The nanoparticles, with diameters of 6-8 nm, have a SmCo5 composition, as indicated by transmission electron microscopy, electron diffraction, and x-ray photoelectron spectroscopy. The magnetization measurement of the nanoparticles, exhibits superparamagnetism, which is blocked for temperatures below ∼110 K, suggesting Ku to be ∼2.1×106 erg/cm3 for the as-prepared particles.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- May 2003
- DOI:
- 10.1063/1.1537697
- Bibcode:
- 2003JAP....93.7589G
- Keywords:
-
- 81.16.Be;
- 61.46.+w;
- 75.50.Tt;
- 81.07.Wx;
- 81.05.Bx;
- 81.20.Ka;
- 75.30.Gw;
- 75.60.Ej;
- Chemical synthesis methods;
- Fine-particle systems;
- nanocrystalline materials;
- Nanopowders;
- Metals semimetals and alloys;
- Chemical synthesis;
- combustion synthesis;
- Magnetic anisotropy;
- Magnetization curves hysteresis Barkhausen and related effects