L10 structure formation in slow-cooled Fe-Au nanoclusters
Abstract
An ordered L10 structure has been formed in near-stoichiometric Fe-Au alloy nanoparticles. The L10 structure with a = 0.367 nm and c = 0.360 nm was observed in nanoclusters with diameters below 10 nm after slow cooling from 600 °C. The stable L10 structure formed from a parent fcc solid solution phase observed in the as-formed clusters. The fcc phase has a lattice parameter of 0.417 nm, significantly expanded compared to both Au and γ-Fe. The saturation magnetization and coercivity of both fcc and L10 structures were much lower than expected considering Fe dilution effects suggesting competing ferromagnetic and anti-ferromagnetic ordering.
- Publication:
-
Applied Physics Letters
- Pub Date:
- May 2012
- DOI:
- Bibcode:
- 2012ApPhL.100u1911M
- Keywords:
-
- antiferromagnetic materials;
- coercive force;
- cooling;
- ferromagnetic materials;
- ferromagnetic-antiferromagnetic transitions;
- gold alloys;
- iron alloys;
- nanofabrication;
- nanomagnetics;
- nanoparticles;
- solid solutions;
- stoichiometry;
- 61.46.Df;
- 75.50.Tt;
- 75.60.Ej;
- 75.50.Bb;
- 81.16.-c;
- 75.50.Ee;
- Nanoparticles;
- Fine-particle systems;
- nanocrystalline materials;
- Magnetization curves hysteresis Barkhausen and related effects;
- Fe and its alloys;
- Methods of nanofabrication and processing;
- Antiferromagnetics