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Interfacial structure dependent spin mixing conductance in cobalt thin films.

Tokaç, M. and Bunyaev, S.A. and Kakazei, G.N. and Schmool, D.S. and Atkinson, D. and Hindmarch, A.T. (2015) 'Interfacial structure dependent spin mixing conductance in cobalt thin films.', Physical review letters., 115 (5). 056601.


Enhancement of Gilbert damping in polycrystalline cobalt thin-film multilayers of various thicknesses, overlayered with copper or iridium, was studied in order to understand the role of local interface structure in spin pumping. X-ray diffraction indicates that cobalt films less than 6 nm thick have strong fcc(111) texture while thicker films are dominated by hcp(0001) structure. The intrinsic damping for cobalt thicknesses above 6 nm is weakly dependent on cobalt thickness for both overlayer materials, and below 6 nm the iridium overlayers show higher damping enhancement compared to copper overlayers, as expected due to spin pumping. The interfacial spin mixing conductance is significantly enhanced in structures where both cobalt and iridium have fcc(111) structure in comparison to those where the cobalt layer has subtly different hcp(0001) texture at the interface.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review Letters 115, 056601 © (2015) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:29 June 2015
Date deposited:03 August 2015
Date of first online publication:30 July 2015
Date first made open access:No date available

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