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Formation of Ferromagnetic FePt Nanoparticles by Ion Implantation

  • C. W. White (a1), S. P. Withrow (a1), J. D. Budai (a1), L. A. Boatner (a1), K. D. Sorge (a1), J. R. Thompson (a1), K. S. Beaty (a2) and A. Meldrum (a2)...

Abstract

Oriented ferromagnetic FePt nanoparticles with the face-centered tetragonal L10 structure were produced in Al2O3 single crystal hosts by ion implantation and annealing. Both the orientation and particle-size of the FePt particles depend strongly on the implantation conditions. The magnetic coercivities are extremely high, reaching values in excess of 20 kOe for Pt concentrations of ∼45% in the FePt alloy. Ferromagnetic FePt nanoparticles were also produced in amorphous SiO2 by ion implantation and annealing.

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