Spin Pumping in Permalloy/Graphene and Permalloy/Graphite Interfaces

    Authors

    S. Singh; A. K. Patra; B. Barin; E. del Barco;B. Ozyilmaz

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Magn.

    Keywords

    Magnetoelectronics; spin polarized transport; ROOM-TEMPERATURE; GRAPHENE FILMS; TRANSPORT; VALVE; Engineering, Electrical & Electronic; Physics, Applied

    Abstract

    This article reports a comparative study of the spin pumping induced by graphite and graphene layers adjacent to an extended ferromagnetic Permalloy film. The corresponding enhancement of the Gilbert damping in the ferromagnet is determined by analyzing the frequency dependence of the ferromagnetic resonance linewidth in experiments done with a broad band microwave spectrometer. The results show that a single graphene layer is more efficient than a thick graphite film in absorbing the angular momentum pumped away from the Permalloy during the resonant precession of its magnetization. We associate this effect to an enhancement of the spin-orbit coupling in the graphene layer due to Copper adatoms residual from the chemical vapor deposition process used to synthesize the graphene used in the experiments.

    Journal Title

    Ieee Transactions on Magnetics

    Volume

    49

    Issue/Number

    7

    Publication Date

    1-1-2013

    Document Type

    Editorial Material

    Language

    English

    First Page

    3147

    Last Page

    3150

    WOS Identifier

    WOS:000322483200019

    ISSN

    0018-9464

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