Adiabatic orbital and spin pumping in metallic heterostructures

Armando Pezo; Aurelien Manchon

doi:10.1117/12.2681203

28 September 2023 Adiabatic orbital and spin pumping in metallic heterostructures

Armando Pezo, Aurelien Manchon

Proceedings Volume 12656, Spintronics XVI; 126560O (2023) https://doi.org/10.1117/12.2681203
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

In this work, we theoretically investigate the coupled spin, charge and orbital dynamics induced by a precessing magnetization in a planar bilayer heterostructure. To do so, we developed a theory of adiabatic pumping using the Keldysh formalism and Wigner expansion to the first order in magnetization dynamics. This approach enables us to model the pumping mechanism beyond the weak spin-orbit coupling limit. We carry out simulations using a model system to determine the parameters that control the pumping of spin and orbital moments into adjacent non-magnetic metals and show that in principle orbital pumping can be as large as spin pumping. We then extend our study to realistic bilayers involving both heavy metals (Pt, W) and light metals (Cu) computed by first principles calculations. We show that, alike spin pumping, strong orbital relaxation in the non-magnetic metal is necessary to maintain strong orbital pumping.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Armando Pezo and Aurelien Manchon "Adiabatic orbital and spin pumping in metallic heterostructures", Proc. SPIE 12656, Spintronics XVI, 126560O (28 September 2023); https://doi.org/10.1117/12.2681203

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