Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 37: Focus Session: Insulator Spintronics

MA 37.5: Hauptvortrag

Mittwoch, 3. April 2019, 17:45–18:15, H38

Magnon Transport and Dynamics in Magnetic Insulator — •Jing Liu — University of Groningen

I will give an overview of our recent results of the transport of thermal magnons in a magnetic insulator, yttrium iron garnet. We have shown that these can be generated electrically and by Joule heating, and can propagate with a typical relaxation length of 10 micrometers[1]. We have developed a theoretical description, where the magnon transport is driven by (a combination of) a gradient of the temperature (magnon spin Seebeck effect) or by the gradient of the magnon chemical potential[2].

Recently, we demonstrated that the magnon transport can be modulated by the injection of magnons by an intermediate electrode, which acts analogously to a gate electrode in electrical field effect transistor[3]. Besides, we investigated the interaction between (nonlocal) magnon transport of thermal magnons and GHz magnetization dynamics. We observe both enhancement and suppression of the magnon transport, and I will discuss the possible origins[4]. Finally, we discovered a new way to inject and detect magnon by using the anomalous spin Hall effect of permalloy. This also provides a possibility of injecting magnon spins with an out-of-plane component[5,6].

[1] L.C. Cornelissen, J. Liu et al. Nature Phys. 11, 1022 (2015) [2] L.C. Cornelissen et al. Phys. Rev. B94, 014412 (2016) [3] L.C. Cornelissen, J. Liu et al. Phys. Rev. Lett. 120, 097702 (2018) [4] J. Liu et al. Arxiv 1810.11667 (2017) [5] K.S. Das et al. Phys. Rev. B96, 220408(R) (2017) [6] K.S. Das, J. Liu et al. Nano Lett. 18. 5633 (2018)