One-step fabrication of L1 0 FePt nanocubes and rods by cluster beam deposition

O. Akdogan, W. Li, G. C. Hadjipanayis, R. Skomski, David J Sellmyer

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this work, single crystal L1 0 FePt nanocubes have been successfully produced by a cluster beam deposition technique without the need of post annealing. Particles have been deposited by dc magnetron sputtering using high Ar pressures on both single crystal Si substrates and Au grids for the measurement of magnetic and structural properties, respectively. The nanocubes have a uniform size distribution with an average size of 5 nm. At 1 Torr, the particles have the L1 0 structure with an order parameter of 0.5 and a RT coercivity of 2 kOe with high switching fields observed in the hysteresis loop. Further annealing increased the particle size to 20 nm and the RT coercivity to 10.2 kOe with perfect chemical ordering. In addition to these nanocubes, micron size rods with the L1 0 structure have been observed near the cluster gun. SEM analysis showed that these rods consist of nanoparticles with 20 nm average size. Surfactant assisted high-energy ball milling has been used to separate the nanoparticles from the rods. After one hour of milling, these 20 nm particles showed a room temperature coercivity of 9 kOe with an order parameter of 0.85. These FePt nanocubes have a potential for use in the development of future high-density magnetic recording media because of their high coercivity, good shape and very narrow size distribution.

Original languageEnglish (US)
Article number07B535
JournalJournal of Applied Physics
Volume111
Issue number7
DOIs
StatePublished - Apr 1 2012

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coercivity
rods
fabrication
nanoparticles
annealing
single crystals
magnetic recording
balls
magnetron sputtering
hysteresis
surfactants
grids
magnetic properties
scanning electron microscopy
room temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

One-step fabrication of L1 0 FePt nanocubes and rods by cluster beam deposition. / Akdogan, O.; Li, W.; Hadjipanayis, G. C.; Skomski, R.; Sellmyer, David J.

In: Journal of Applied Physics, Vol. 111, No. 7, 07B535, 01.04.2012.

Research output: Contribution to journalArticle

Akdogan, O. ; Li, W. ; Hadjipanayis, G. C. ; Skomski, R. ; Sellmyer, David J. / One-step fabrication of L1 0 FePt nanocubes and rods by cluster beam deposition. In: Journal of Applied Physics. 2012 ; Vol. 111, No. 7.
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