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O: Fachverband Oberflächenphysik

O 60: Mini-Symposium: Dzyaloshinskii-Moriya Interaction (DMI) in magnetic layered systems I

O 60.4: Invited Talk

Wednesday, March 3, 2021, 12:00–12:30, R3

Spin Orbit driven effects in Graphene-FM systems — •Paolo Perna — IMDEA Nanociencia, 28049 Madrid, Spain

A major challenge for future spintronics is to develop suitable spin transport channels with superior properties such as long spin lifetime and propagation length. Graphene can meet these requirements, even at room temperature [1], but other active properties, such as magnetic order and large spin-orbit coupling (SOC), need to be incorporated into graphene [2]. Taking advantage of the fast motion of perpendicular magnetic anisotropy (PMA) chiral spin textures can satisfy the demands for high-density data storage, low power consumption and high processing speed [3], while the presence of graphene enables the possibility to electrically tune the magnetic properties [4]. Here, I report on high quality, epitaxial graphene/Co(111)/HM(111) stacks grown on (111)-oriented insulating oxide crystals which exhibit enhanced PMA for Co layers up to 4 nm thick and left-handed Néel-type chiral DWs stabilized by interfacial Dzyaloshinskii-Moriya interaction (DMI) localized at both graphene/Co and Co/HM interfaces with opposite sign [4,5]. While the DMI at Co/HM side is due to the intrinsic SOC, the sizeable DMI experimentally found at the Gr/Co interface has Rashba origin [5]. The active magnetic texture is protected by the graphene monolayer and stable at 300 K in air, and, since it is grown on an insulating substrate, amenable to be controlled electrically [3]. [1] Nat. Nanotech. 9, 794 (2014). [2] Nat. Nanotech. 8, 152 (2013). [3] https://nanociencia.imdea.org/sographmem/ [4] Nano Lett. 18(9), 5364 (2018). [5] ACS Appl. Mat.&Int., 12, 4088 (2020).