Nano Archive

Synthesis of single-crystal Sm-Co nanoparticles by cluster beam deposition

Akdogan, O. and Li, W. and Hadjipanayis, G. C. and Sellmyer, D. J. (2011) Synthesis of single-crystal Sm-Co nanoparticles by cluster beam deposition. Journal of Nanoparticle Research, 13 (12). pp. 7005-7012.

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Abstract

Single-crystal Sm-Co nanoparticles have been successfully produced by a cluster beam deposition technique. Particles have been deposited by DC magnetron sputtering using high Ar pressures on both single-crystal Si substrates and Au grids for the magnetic and structural/microstructural properties, respectively. Oxidation of the particles is prevented by using carbon buffer and cover layers. Nanoparticles have a uniform size distribution with an average size of 4.2, 6 and 7 nm at 1, 1.5 and 2 Torr of Ar pressure, respectively. At 1 Torr, the particles have the disordered 1:7 structure and a high coercivity of 19 kOe at 10 K. These particles show a superparamagnetic behavior with a blocking temperature of T B = 145 K. From this value of T B and the particle volume, the value of anisotropy constant K is estimated to be around 2.2 × 10 7 ergs/cc. Heat is introduced to the particles during their flight to the substrate to increase the particle size. Nanoparticles of SmCo 5 with an average size of 15 nm and high room temperature coercivity have been produced. No change in magnetic and structural properties of the samples has been observed even after 10 months. Cluster beam deposition could play a key role for the production of rare earth nanoparticles for many applications.

Item Type:Article
ID Code:11424
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:29
Last Modified:05 Jan 2012 09:42

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