Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

N. Vlietstra; J. Shan; V. Castel; J. Ben Youssef; G. E.W. Bauer; B. J. Van Wees

doi:10.1063/1.4813760

Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

N. Vlietstra, J. Shan, V. Castel, J. Ben Youssef, G. E.W. Bauer, B. J. Van Wees

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

90 Citations (Scopus)

Abstract

The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well described by the theoretical model of SMR in terms of the direct and inverse spin-Hall effect, for different Pt thicknesses [3, 4, 8, and 35 nm]. Adopting a spin-Hall angle of Pt θ_SH = 0.08, we obtain the spin diffusion length of Pt (λ = 1.1 ± 0.3 nm) as well as the real (G_r= (7 ± 3) × 10¹⁴ Ω ^-1 m ^-2) and imaginary part (G_i = (5 ± 3) × 10¹³ Ω ^-1 m ^-2) of the spin-mixing conductance and their ratio (G_r/ G_i = 16 ± 4).

Original language	English
Article number	032401
Journal	Applied Physics Letters
Volume	103
Issue number	3
DOIs	https://doi.org/10.1063/1.4813760
Publication status	Published - 2013 Jul 15

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title = "Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance",

abstract = "The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well described by the theoretical model of SMR in terms of the direct and inverse spin-Hall effect, for different Pt thicknesses [3, 4, 8, and 35 nm]. Adopting a spin-Hall angle of Pt θSH = 0.08, we obtain the spin diffusion length of Pt (λ = 1.1 ± 0.3 nm) as well as the real (Gr= (7 ± 3) × 1014 Ω -1 m -2) and imaginary part (Gi = (5 ± 3) × 1013 Ω -1 m -2) of the spin-mixing conductance and their ratio (Gr/ Gi = 16 ± 4).",

author = "N. Vlietstra and J. Shan and V. Castel and {Ben Youssef}, J. and Bauer, {G. E.W.} and {Van Wees}, {B. J.}",

note = "Funding Information: We would like to acknowledge B. Wolfs, M. de Roosz, and J. G. Holstein for technical assistance. This work is part of the research program of the Foundation for Fundamental Research on Matter (FOM), EU-ICT-7 “MACALO,” and DFG Priority Programme 1538 “Spin-Caloric Transport” (BA 2954/1-1) and is supported by NanoNextNL, a micro and nanotechnology consortium of the Government of the Netherlands and 130 partners, by NanoLab NL, and the Zernike Institute for Advanced Materials. ",

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doi = "10.1063/1.4813760",

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AU - Shan, J.

AU - Castel, V.

AU - Ben Youssef, J.

AU - Bauer, G. E.W.

AU - Van Wees, B. J.

N1 - Funding Information: We would like to acknowledge B. Wolfs, M. de Roosz, and J. G. Holstein for technical assistance. This work is part of the research program of the Foundation for Fundamental Research on Matter (FOM), EU-ICT-7 “MACALO,” and DFG Priority Programme 1538 “Spin-Caloric Transport” (BA 2954/1-1) and is supported by NanoNextNL, a micro and nanotechnology consortium of the Government of the Netherlands and 130 partners, by NanoLab NL, and the Zernike Institute for Advanced Materials.

PY - 2013/7/15

Y1 - 2013/7/15

N2 - The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well described by the theoretical model of SMR in terms of the direct and inverse spin-Hall effect, for different Pt thicknesses [3, 4, 8, and 35 nm]. Adopting a spin-Hall angle of Pt θSH = 0.08, we obtain the spin diffusion length of Pt (λ = 1.1 ± 0.3 nm) as well as the real (Gr= (7 ± 3) × 1014 Ω -1 m -2) and imaginary part (Gi = (5 ± 3) × 1013 Ω -1 m -2) of the spin-mixing conductance and their ratio (Gr/ Gi = 16 ± 4).

AB - The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well described by the theoretical model of SMR in terms of the direct and inverse spin-Hall effect, for different Pt thicknesses [3, 4, 8, and 35 nm]. Adopting a spin-Hall angle of Pt θSH = 0.08, we obtain the spin diffusion length of Pt (λ = 1.1 ± 0.3 nm) as well as the real (Gr= (7 ± 3) × 1014 Ω -1 m -2) and imaginary part (Gi = (5 ± 3) × 1013 Ω -1 m -2) of the spin-mixing conductance and their ratio (Gr/ Gi = 16 ± 4).

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Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

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