Nonlinear spin torque, pumping, and cooling in superconductor/ferromagnet systems
Ojajärvi, R., Manninen, J., Heikkilä, T. T., & Virtanen, P. (2020). Nonlinear spin torque, pumping, and cooling in superconductor/ferromagnet systems. Physical Review B, 101(11), Article 115406. https://doi.org/10.1103/PhysRevB.101.115406
Published inPhysical Review B
©2020 American Physical Society
We study the effects of the coupling between magnetization dynamics and the electronic degrees of freedom in a heterostructure of a metallic nanomagnet with dynamic magnetization coupled with a superconductor containing a steady spin-splitting field. We predict how this system exhibits a nonlinear spin torque, which can be driven either with a temperature difference or a voltage across the interface. We generalize this notion to arbitrary magnetization precession by deriving a Keldysh action for the interface, describing the coupled charge, heat, and spin transport in the presence of a precessing magnetization. We characterize the effect of superconductivity on the precession damping and the antidamping torques. We also predict the full nonlinear characteristic of the Onsager counterparts of the torque, showing up via pumped charge and heat currents. For the latter, we predict a spin-pumping cooling effect, where the magnetization dynamics can cool either the nanomagnet or the superconductor. ...
PublisherAmerican Physical Society
Publication in research information system
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work wassupported by Academy of Finland Project No. 317118 and No.321982, the European Union’s Horizon 2020 Research andInnovation Framework Programme under Grant No. 800923(SUPERTED), and Jenny and Antti Wihuri Foundation.
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