Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 41: Spintronics (Other Effects)

MA 41.2: Talk

Thursday, March 21, 2024, 15:15–15:30, H 2013

Temperature dependence of disorder effect on the spin current in insulator-metal layered systems — •Mahsa Seyed Heydari, Wolfgang Belzig, and Niklas Rohling — Konstanz University, Konstanz, Germany

We investigate theoretically spin transport through the interface of a non-magnetic metal and an antiferromagnetic insulator driven e.g. by a spin accumulation generated by the spin Hall effect. Our study is motivated by experimental [1] and theoretical [2] work on spin transport through layered systems that include magnetically ordered insulators and non-magnetic metals. Specifically, there is a big interest in the role of thin antiferromagnetic layers. We describe the effect of the interface broadening on the spin current and investigate how disorder-induced broadening of scattering matrix elements with respect to the in-plane momentum influences the spin current. By using Fermi*s Golden rule the spin current can be computed [3]. Our results allow insights into the temperature dependence of the interface-disorder-induced influence on the spin current. In general, we find that increasing disorder leads to a decrease in spin current. Additionally, for a magnetically compensated interface, we find a thermal-gradient contribution to the spin current (spin Seebeck effect) only as a higher-order effect.

[1] Pati, Materials Letters 299, 130088 (2021)

[2] Gulbrandsen, Brataas, Phys. Rev. B 97, 054409 (2018)

[3] Fj*rbu et al., Phys. Rev. B 95, 144408 (2017)

Keywords: Spin transport; Magnonics; spin Hall effect