Exploring magnetic excitations in the condensed matter using single electron spins

ORAL

Abstract

Pushing the frontiers of condensed-matter magnetism requires tools to probe magnetic excitations on the nanometer scale. We have developed a new approach to exploring magnetic excitations in correlated-electron systems [1], using magnetometry based on single electron spins in diamond. We demonstrate the power of this approach by detecting spin-wave excitations in a ferromagnetic microdisc with nanoscale spatial sensitivity over a broad range of frequencies and magnetic fields. In addition, we show how spin-wave resonances can be exploited for on-chip amplification of microwave magnetic fields, allowing strongly increased spin manipulation rates and single-spin magnetometry with enhanced sensitivity. These results can be directly applied to nanoscale magnetic imaging of spin-wave propagation and magnetic vortex/skyrmion dynamics, and open the way towards spin-spin coupling via ferromagnets.\\[4pt] [1] T.~van~der~Sar, F.~Casola, R.~Walsworth, and A.~Yacoby, arXiv:1410.6423 (2014).

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Authors

  • Toeno van der Sar

    • Physics Department, Harvard University
    • Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, USA
    • Harvard University

  • Francesco Casola

    • Harvard-Smithsonian Center for Astrophysics

  • Ronald Walsworth

    • 1) Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA, 2) Department of Physics, Harvard University
    • Harvard-Smithsonian Center for Astrophysics

  • Amir Yacoby

    • Physics Department, Harvard University
    • Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, USA
    • Harvard University