Formation of Ferromagnetic FePt Nanoparticles by Ion Implantation

摘要

Oriented ferromagnetic FePt nanoparticles with the face-centered tetragonal L1_0 structure were produced in Al_2O_3 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 SiO_2 by ion implantation and annealing.