Anisotropic Absorption of Pure Spin Currents

A. A. Baker; A. I.  Figueroa; Christopher Love; Stuart Alan Cavill; T Hesjedal; G. van der Laan

doi:10.1103/PhysRevLett.116.047201

Anisotropic Absorption of Pure Spin Currents

A. A. Baker, A. I. Figueroa, Christopher Love, Stuart Alan Cavill, T Hesjedal, G. van der Laan

Physics

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

Abstract

Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping parameter, α, in the spin sink layer. Using lab- and synchrotron-based ferromagnetic resonance, we show that an in-plane variation of damping in a crystalline Co50Fe50 layer leads to an anisotropic α in a polycrystalline Ni81Fe19 layer. This anisotropy is suppressed above the spin diffusion length in Cr, which is found to be 8 nm, and is independent of static exchange coupling in the spin valve. These results offer a valuable insight into the transmission and absorption of spin currents, and a mechanism by which enhanced spin torques and angular control may be realized for next-generation spintronic devices.

Original language	English
Article number	047201
Number of pages	6
Journal	Physical Review Letters
Volume	116
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.116.047201
Publication status	Published - 27 Jan 2016

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10.1103/PhysRevLett.116.047201

Anisotropic Absorption of Pure Spin Currents
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PhysRevLett.116.047201
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http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.047201

Cite this

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title = "Anisotropic Absorption of Pure Spin Currents",

abstract = "Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping parameter, α, in the spin sink layer. Using lab- and synchrotron-based ferromagnetic resonance, we show that an in-plane variation of damping in a crystalline Co50Fe50 layer leads to an anisotropic α in a polycrystalline Ni81Fe19 layer. This anisotropy is suppressed above the spin diffusion length in Cr, which is found to be 8 nm, and is independent of static exchange coupling in the spin valve. These results offer a valuable insight into the transmission and absorption of spin currents, and a mechanism by which enhanced spin torques and angular control may be realized for next-generation spintronic devices.",

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AU - Baker, A. A.

AU - Figueroa, A. I.

AU - Love, Christopher

AU - Cavill, Stuart Alan

AU - Hesjedal, T

AU - van der Laan, G.

N1 - This content is made available by the publisher under a Creative Commons CC BY Licence

PY - 2016/1/27

Y1 - 2016/1/27

N2 - Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping parameter, α, in the spin sink layer. Using lab- and synchrotron-based ferromagnetic resonance, we show that an in-plane variation of damping in a crystalline Co50Fe50 layer leads to an anisotropic α in a polycrystalline Ni81Fe19 layer. This anisotropy is suppressed above the spin diffusion length in Cr, which is found to be 8 nm, and is independent of static exchange coupling in the spin valve. These results offer a valuable insight into the transmission and absorption of spin currents, and a mechanism by which enhanced spin torques and angular control may be realized for next-generation spintronic devices.

AB - Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping parameter, α, in the spin sink layer. Using lab- and synchrotron-based ferromagnetic resonance, we show that an in-plane variation of damping in a crystalline Co50Fe50 layer leads to an anisotropic α in a polycrystalline Ni81Fe19 layer. This anisotropy is suppressed above the spin diffusion length in Cr, which is found to be 8 nm, and is independent of static exchange coupling in the spin valve. These results offer a valuable insight into the transmission and absorption of spin currents, and a mechanism by which enhanced spin torques and angular control may be realized for next-generation spintronic devices.

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Anisotropic Absorption of Pure Spin Currents

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