9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Half-metallic ferromagnetic ordering in Fe-doped diamond

12 Jul 2012, 17:30
2h
IT Building

IT Building

Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster Session

Speaker

Mr Evans Benecha (University of South Africa)

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Main supervisor (name and email)<br>and his / her institution

Prof EB Lombardi; lombaeb@unisa.ac.za; UNISA

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Abstract content <br> &nbsp; (Max 300 words)

Half-metallic semiconductor materials are envisaged to achieve high spin polarisation and electrical injection efficiency desirable for spintronic device development. However, lack of fundamental material properties and low ferromagnetic transition temperatures has hindered practical room temperature applications. We report ab initio pseudopotential DFT calculations on the magnetic ordering properties of Fe-doped diamond and show that half-metallic ferromagnetic ordering can be achieved in diamond – which is well known for its extreme material properties – by incorporating Fe+1 at the substitutional lattice site. We find substitutional Fe+1 to be the most stable form of Fe in p-type diamond for Fermi energies in the range of 0.37 - 0.98 eV above the valence band maximum, which, importantly, corresponds to that of boron doped diamond; this is likely to further increase the spin charge concentration if Fe is co-doped with boron in diamond. At the substitutional site, we find that isolated Fe+1 possesses a magnetic moment of 1.0 μB per Fe+1 ion in a diamond supercell and a large ferromagnetic stabilization energy of 33 meV, with the Fermi level crossing bands for only the spin-up orientation, demonstrating that Fe-doped diamond is likely to form a half-metallic diluted ferromagnetic semiconductor.

Primary author

Mr Evans Benecha (University of South Africa)

Co-author

Prof. Enrico Lombardi (University of South Africa)

Presentation Materials

Peer reviewing

Paper