Generation of out-of-plane polarized spin current by spin swapping

Hazra, Binoy K.; Pal, Banabir; Jeon, Jae-Chun; Neumann, Robin R.; Göbel, Börge; Grover, Bharat; Deniz, Hakan; Styervoyedov, Andriy; Meyerheim, Holger; Mertig, Ingrid; Yang, See-Hun; Parkin, Stuart S. P.

doi:10.1038/s41467-023-39884-6

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Generation of out-of-plane polarized spin current by spin swapping

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Hazra, Binoy K.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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

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Jeon, Jae-Chun
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Grover, Bharat
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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Styervoyedov, Andriy
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Meyerheim, Holger
Department of Synthetic Materials and Functional Devices (SMFD), 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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Citation

Hazra, B. K., Pal, B., Jeon, J.-C., Neumann, R. R., Göbel, B., Grover, B., et al. (2023). Generation of out-of-plane polarized spin current by spin swapping. Nature Communications, 14: 4549. doi:10.1038/s41467-023-39884-6.

Cite as: https://hdl.handle.net/21.11116/0000-000D-8C9C-6

Abstract

The generation of spin currents and their application to the manipulation of magnetic states is fundamental to spintronics. Of particular interest are chiral antiferromagnets that exhibit properties typical of ferromagnetic materials even though they have negligible magnetization. Here, we report the generation of a robust spin current with both in-plane and out-of-plane spin polarization in epitaxial thin films of the chiral antiferromagnet Mn₃Sn in proximity to permalloy thin layers. By employing temperature-dependent spin-torque ferromagnetic resonance, we find that the chiral antiferromagnetic structure of Mn3Sn is responsible for an in-plane polarized spin current that is generated from the interior of the Mn₃Sn layer and whose temperature dependence follows that of this layer’s antiferromagnetic order. On the other hand, the out-of-plane polarized spin current is unrelated to the chiral antiferromagnetic structure and is instead the result of scattering from the Mn3Sn/permalloy interface. We substantiate the later conclusion by performing studies with several other non-magnetic metals all of which are found to exhibit out-of-plane polarized spin currents arising from the spin swapping effect.