Atomic scale control of spin current transmission at interfaces

Wahada, Mohamed Amine; Şaşıoğlu, Ersoy; Hoppe, Wolfgang; Zhou, Xilin; Deniz, Hakan; Rouzegar, Reza; Kampfrath, Tobias; Mertig, Ingrid; Parkin, Stuart S. P.; Woltersdorf, Georg

doi:10.1021/acs.nanolett.1c04358

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Atomic scale control of spin current transmission at interfaces

MPS-Authors

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Wahada, Mohamed Amine
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;
International Max Planck Research School for Science and Technology of Nano-Systems, Max Planck Institute of Microstructure Physics, Max Planck Society;

Zhou, Xilin
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Deniz, Hakan
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin, Stuart S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Woltersdorf, Georg
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1021/acs.nanolett.1c04358
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acs.nanolett.1c04358.pdf
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引用

Wahada, M. A., Şaşıoğlu, E., Hoppe, W., Zhou, X., Deniz, H., Rouzegar, R., Kampfrath, T., Mertig, I., Parkin, S. S. P., & Woltersdorf, G. (2022). Atomic scale control of spin current transmission at interfaces. Nano Letters, 22(9), 3539-3544. doi:10.1021/acs.nanolett.1c04358.

引用: https://hdl.handle.net/21.11116/0000-000A-903E-E

要旨

Ferromagnet/heavy metal bilayers represent a central building block for spintronic devices where the magnetization of the ferromagnet can be controlled by spin currents generated in the heavy metal. The efficiency of spin current generation is paramount. Equally important is the efficient transfer of this spin current across the ferromagnet/heavy metal interface. Here, we show theoretically and experimentally that for Ta as heavy metal the interface only partially transmits the spin current while this effect is absent when Pt is used as heavy metal. This is due to magnetic moment reduction at the interface caused by 3d–5d hybridization effects. We show that this effect can be avoided by atomically thin interlayers. On the basis of our theoretical model we conclude that this is a general effect and occurs for all 5d metals with less than half-filled 5d shell.