Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.23: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Proximity induced exchange interaction in graphene-YIG devices — •Alexey Kaverzin, Johannes C. Leutenantsmeyer, Magdalena Wojtaszek, and Bart J. van Wees — Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, The Netherlands

Graphene is one of the promising platforms for the realisation of various spintronics devices. Large spin relaxation length and long spin relaxation time insure a reliable transport of the spin signal over a relatively large distances. Moreover, graphene is extremely sensitive to the environment and, therefore, can potentially adopt the properties of the underlying substrate via proximity effect.

In this work we study the effect of the ferrimagnetic electrically insulating substrate on the spin transport in exfoliated monolayer graphene. As a substrate we use yttrium iron garnet which preserves the magnetic ordering even at room temperature and induces a finite exchange interaction in the nearby graphene [1,2]. The change in the band structure results in a modified behavior of spins in graphene. We extend the standard Bloch diffusion equation with an additional exchange field and employ the solutions to fit the results. The extracted exchange field is found to be around 0.2 T. With these findings we show the robust method for producing ferromagnetic graphene and demonstrate a most direct method to probe the presence of an exchange interaction.

[1] Z. Wang et.al., Phys Rev Letters 114, 016603, (2015)

[2] J.C. Leutenantsmeyer et.al., 2D Materials 4, 1 (2017)