Ferromagnetism in Mn-implanted HOPG

ORAL

Abstract

20 keV energy Mn ions were implanted on HOPG samples at 300$^{\circ}$C. SQUID magnetometer measurements show ferromagnetic ordering and magnetic hysteresis at very low temperatures. Mn K-edge XAS spectra show presence of Mn and O in our sample and XMCD data shows ferromagnetic ordering of Mn at 14 K, but not at 300 K. SIMS data show presence of Mn and O with carbon, besides other elements. Raman spectroscopy results indicate disorder graphite phase and high resolution TEM images confirm amorphous Mn-implanted region with presence of nanocrystallites.

*This work was supported by SWAN and NSF DMR 0605828.

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Authors

  • Samaresh Guchhait

    • The University of Texas at Austin

  • Hendrik Ohldag

    • SLAC National Accelerator Laboratory
    • Stanford Synchrotron Radiation Lightsource
    • SLAC
    • SLAC National Accelerator Center

  • Domingo Ferrer

    • The University of Texas at Austin

  • Sanjay Banerjee

    • University of Texas at Austin
    • The University of Texas at Austin
    • Microelectronics Research Center, The University of Texas at Austin