| AVS 62nd International Symposium & Exhibition | |
| Thin Film | Friday Sessions |
| Session TF+MI-FrM |
| Session: | Thin Films for Light Trapping, Plasmonic, and Magnetic Applications |
| Presenter: | Richard Vanfleet, Brigham Young University |
| Authors: | G. Sutherland, Brigham Young University D. Wood, Brigham Young University A. Warren, University of Central Florida K. Coffey, University of Central Florida R. Vanfleet, Brigham Young University |
| Correspondent: | Click to Email |
Chemically ordering metal alloys such as FePt are hard magnets and good candidates for magnetic data storage in their ordered phase but not in the disordered state. The order-disorder phase transition temperature is impacted by the size of the particle with surface energies becoming significant for nanometer sized particles. Theoretical and computational approaches have predicted lowering of phase transition temperatures as the particle size decreases. Experimental evidence is more limited. Observation of ordering in nanoparticles is a complex interplay between thermodynamic and kinetic factors. Using Fe-Ni pseudo binary alloys with Pt allows isolation of thermodynamic variables. We see a size dependent reduction of order-disorder temperature in this system with particles in the 5 – 12 nm range. At 6 nm the reduction is ~15%