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    Large spin pumping effect in antisymmetric precession of Ni79Fe21/Ru/Ni79Fe21 (2016)
    American Institute of Physics (AIP)
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    Publication Date: 2016-06-14
    Description: In magnetic trilayer structures, a contribution to the Gilbert damping of ferromagnetic resonance arises from spin currents pumped from one layer to another. This contribution has been demonstrated for layers with weakly coupled, separated resonances, where magnetization dynamics are excited predominantly in one layer and the other layer acts as a spin sink. Here, we show that trilayer structures in which magnetizations are excited simultaneously, antisymmetrically, show a spin-pumping effect roughly twice as large. The antisymmetric (optical) mode of antiferromagnetically coupled Ni 79 Fe 21 (8 nm)/Ru/Ni 79 Fe 21 (8 nm) trilayers shows a Gilbert damping constant greater than that of the symmetric (acoustic) mode by an amount as large as the intrinsic damping of Py ( Δ α ≃ 0.006 ). The effect is shown equally in field-normal and field-parallel to film plane geometries over 3–25 GHz. The results confirm a prediction of the spin pumping model and have implications for the use of synthetic antiferromagnets (SAF)-structures in GHz devices.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Wave-Number-Dependent Gilbert Damping in Metallic Ferromagnets (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-03-19
    Description: Author(s): Y. Li and W. E. Bailey A wave-number-dependent dissipative term to magnetization dynamics, mirroring the conservative term associated with exchange, has been proposed recently for ferromagnetic metals. We present measurements of wave-number-( k -)dependent Gilbert damping in three metallic ferromagnets, NiFe, Co, and CoFeB,… [Phys. Rev. Lett. 116, 117602] Published Fri Mar 18, 2016
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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