Magnetic Moment Formation in Graphene Detected by Scattering of Pure Spin Currents

Kathleen M. McCreary, Adrian G. Swartz, Wei Han, Jaroslav Fabian, and Roland K. Kawakami
Phys. Rev. Lett. 109, 186604 – Published 2 November 2012
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Abstract

Hydrogen adatoms are shown to generate magnetic moments inside single layer graphene. Spin transport measurements on graphene spin valves exhibit a dip in the nonlocal spin signal as a function of the applied magnetic field, which is due to scattering (relaxation) of pure spin currents by exchange coupling to the magnetic moments. Furthermore, Hanle spin precession measurements indicate the presence of an exchange field generated by the magnetic moments. The entire experiment including spin transport is performed in an ultrahigh vacuum chamber, and the characteristic signatures of magnetic moment formation appear only after hydrogen adatoms are introduced. Lattice vacancies also demonstrate similar behavior indicating that the magnetic moment formation originates from pz-orbital defects.

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  • Received 20 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.186604

© 2012 American Physical Society

Authors & Affiliations

Kathleen M. McCreary1, Adrian G. Swartz1, Wei Han1, Jaroslav Fabian2, and Roland K. Kawakami1,*

  • 1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA
  • 2Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany

  • *roland.kawakami@ucr.edu

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Issue

Vol. 109, Iss. 18 — 2 November 2012

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