STM and SQUID studies of quantum engineered Co magnetic nanoplateles on Si.

ORAL

Abstract

Self-organized Co platelets with uniform size and shape were grown on a template of ordered Al cluster arrays on Si(111)-7$\times $7 surfaces. The Al nanocluster array not only suppresses reaction between Si and Co, but also enables formation of well-defined Co nanoplatelets. These platelets are equilateral triangles with fixed orientation and two-monolayer thickness, and the area of individual platelets is half of N$^{2}$ of the 7$\times $7 unit cells. Despite their small volume (a few nm$^{3})$, these magnetic nanoplatelets exhibit unusually high blocking temperature ($>$100 K). The hysterisis curves obtained for these platelets suggest that easy axis of magnetization is perpendicular to the substrate plane. The perpendicular magnetization, high blocking temperature and growth on a silicon surface may make these platelets appealing for technological applications.

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Authors

  • U. M. Mirsaidov

    • Department of Physics, University of Texas at Austin

  • J.-L. Li

  • S.-Y. Qin

  • Chih-Kang Shih

    • Physics Department, The University of Texas at Austin, Austin, Texas, 78712
    • University of Texas at Austin
    • The University of Texas at Austin
    • Department of Physics, University of Texas at Austin

  • J. T. Markert

    • Department of Physics, The University of Texas at Austin

  • Z. Zhang

    • Oak Ridge National Laboratory, Tennessee

  • J.-F. Jia

  • Q.-K. Xue

    • State Key Laboratory for Surface Physics and International Center for Quantum Structures, Institute of Physics, Chinese Academy of Sciences, Beijing