Synthesis of single-crystal Sm-Co nanoparticles by cluster beam deposition |
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| Authors: | O Akdogan W Li G C Hadjipanayis D J Sellmyer |
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| Institution: | (1) Department of Physics and Astronomy, University of DE, Newark, DE, USA;(2) Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, USA |
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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 TB = 145 K. From this value of TB and the particle volume, the value of anisotropy constant K is estimated to be around 2.2 × 107 ergs/cc. Heat is introduced to the particles during their flight to the substrate to increase the particle size. Nanoparticles
of SmCo5 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. |
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