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Appl. Phys. Lett. 98, 052508 (2011); http://dx.doi.org/10.1063/1.3551729 (3 pages)

Dependence of nonlocal Gilbert damping on the ferromagnetic layer type in ferromagnet/Cu/Pt heterostructures

A. Ghosh1, J. F. Sierra1, S. Auffret1, U. Ebels1, and W. E. Bailey2

1SPINTEC, UMR (8191) CEA/CNRS/UJF/Grenoble INP; INAC, 17 rue des Martyrs, 38054 Grenoble Cedex, France
2Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA

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(Received 24 November 2010; accepted 8 January 2011; published online 2 February 2011)

We have measured the size effect in the nonlocal Gilbert relaxation rate in ferromagnet (FM) (tFM)/Cu(3 nm)[/Pt(2 nm)]/Al(3 nm) heterostructures, FM = {Ni81Fe19,Co60Fe20B20,pure Co}. A common behavior is observed for three FM layers where the additional relaxation obeys both a strict inverse power law dependence ΔG = Ktn, n = −1.04±0.06 and a similar magnitude K = 224±40 MHz⋅nm. As the tested FM layers span an order of magnitude in spin diffusion length λSD, the results are in support of spin diffusion rather than nonlocal resistivity as the origin of the effect.

© 2011 American Institute of Physics

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KEYWORDS and PACS

PACS

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 75.40.Gb

    Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

  • 76.50.+g

    Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance

ARTICLE DATA

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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