SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Spin Transport and Orbitronics, Spin-Hall Effects (joint session MA/TT)

MA 4.6: Vortrag

Montag, 27. März 2023, 10:45–11:00, HSZ 403

Influence of Disorder at Insulator-Metal Interface on Spin Transport — Mahsa Alsadat Seyed Heydari, Wolfgang Belzig, and •Niklas Rohling — Department of Physics, University of Konstanz

Motivated by experimental work showing enhancement of spin transport between yttrium iron garnet and platinum by the thin antiferromagnetic insulator NiO [1] between them, we consider spin transport trough the interface of a non-magnetic metal and a ferro- or antiferromagnetically ordered insulator. The spin transport is carried by spin-polarized electrons in the metal and by magnons in the insulator. Spin current can be generated by a spin accumulation in the metal due to the inverse spin Hall effect, a microwave field exciting magnons in the insulator, or by a thermal gradient (spin Seebeck effect). The spin current can be computed using Fermi's Golden Rule [2]. For a perfectly clean interface, the in-plane momentum is conserved for the electron-magnon scattering events which govern the spin transport through the interface. We calculate how disorder-induced broadening of the scatting matrix elements with respect to the in-plane momentum influences the spin current. As a general result, we observe that for many experimental setups, one should expect a rather small effect of interface disorder on the measured spin current.

[1] Wang et al., Phys. Rev. Lett. 113, 097202 (2014), Phys. Rev. B 91, 220410(R) (2015); Lin et al. Phys. Rev. Lett. 116, 186601 (2016)

[2] Bender et al., Phys. Rev. Lett. 108, 246601 (2012)