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Spin current propagation through ultra-thin insulating layers in multilayered ferromagnetic systems.

Swindells, C. and Hindmarch, A. T. and Gallant, A. J. and Atkinson, D. (2020) 'Spin current propagation through ultra-thin insulating layers in multilayered ferromagnetic systems.', Applied physics letters., 116 (4). 042403.

Abstract

Spin current pumping from a ferromagnet through an insulating layer into a heavy metal was studied in a CoFeB/SiO2/Pt system in relation to the thickness and interfacial structure of the insulating layer. The propagation of spin current from the ferromagnet into the heavy metal falls rapidly with sub-nanometer thicknesses of SiO2 and is suppressed beyond a nominal thickness of 2 nm. Structural analysis shows that SiO2 only forms a complete barrier layer beyond around 2 nm, indicating that the presence of a discontinuous insulating barrier, and not tunneling or diffusion, explains the main observations of spin-pumping with thin insulating layers.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1063/1.5119787
Publisher statement:This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Swindells, C., Hindmarch, A. T., Gallant, A. J. & Atkinson, D. (2020). Spin current propagation through ultra-thin insulating layers in multilayered ferromagnetic systems. Applied Physics Letters 116(4): 042403 and may be found at https://doi.org/10.1063/1.5119787
Date accepted:17 January 2020
Date deposited:31 January 2020
Date of first online publication:28 January 2020
Date first made open access:31 January 2020

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