• 文献标题:   Spin Pumping in Permalloy/Graphene and Permalloy/Graphite Interfaces
  • 文献类型:   Article, Proceedings Paper
  • 作  者:   SINGH S, PATRA AK, BARIN B, DEL BARCO E, OZYILMAZ B
  • 作者关键词:   magnetoelectronic, spin polarized transport
  • 出版物名称:   IEEE TRANSACTIONS ON MAGNETICS
  • ISSN:   0018-9464 EI 1941-0069
  • 通讯作者地址:   Univ Cent Florida
  • 被引频次:   8
  • DOI:   10.1109/TMAG.2013.2244067
  • 出版年:   2013

▎ 摘  要

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.