Method of producing self-assembled cubic FePt nanoparticles and apparatus using same

1. A method comprising:

heating a solution of platinum acetylacetonate, iron pentacarbonyl, oleic acid, and oleylamine in dichlorobenzene to a reflux temperature;

refluxing the solution; and

using the solution to deposit substantially cubic shaped FePt nanoparticles onto a surface, wherein the nanoparticles have facets parallel to (001) crystalline planes and have [100] axes perpendicular to the surface.

2. The method of claim 1 , wherein:

the solution is heated at 4° C. per minute.

3. The method of claim 1 , wherein:

the concentration of the platinum (II) acetylacetonate is 0.5 mmol., the concentration of the Fe(CO) 5 is 0.5 mmol., the concentration of the oleic acid is 4 mmol., and the concentration of the oleylamine is 4 mmol.

4. The method of claim 1 , wherein:

the reflux temperature is 170° C.

5. The method of claim 1 , wherein:

the solution is refluxed for 24 hours.

6. The method of claim 1 , wherein:

the method forms a colloidal solution of the FePt nanoparticles coated with a layer of mixed oleic acid and oleylamine.

7. The method of claim 6 , further comprising:

washing the colloidal solution.

8. The method of claim 6 , further comprising:

adding a 50:50 mixture of hexane to the washed colloidal solution to redisperse the FePt nanoparticles.

9. The method of claim 1 , further comprising:

depositing the FePt nanoparticles in a locking pattern on a substrate.

10. The method of claim 1 , wherein:

the FePt nanoparticles are self-assembled by placing a drop of the refluxed solution onto carbon-coated copper grids and allowing the solvent to dry.

11. The method of claim 1 , wherein:

the concentration of the FePt nanoparticle is approximately 2 mg/ml.