Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.18: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Spin transport across antiferromagnetic IrMn thin films — •Joel Cramer1,2, Bowen Dong1,2, Samridh Jaiswal1,3, Felix Fuhrmann1, Gerhard Jakob1, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany — 3Singulus Technologies AG, Hanauer Landstraße 103, 63796 Kahl am Main, Germany
Recently, the investigation of magnonic spin currents in antiferromagnetic materials has gained interest. We present measurements on the spin transmission of metallic, antiferromagnetic iridium manganese (IrMn) thin films in yttrium iron garnet (YIG)/IrMn/Pt tri-layers. For this purpose, spin Seebeck (SSE) as well as spin Hall magnetoresistance (SMR) measurements have been performed. When measured as a function of temperature, a signal maximum appears in the temperature profile of the SSE amplitude with the temperature of the maximum depending on the IrMn thickness. Below this temperature, the signal decreases rapidly and is eventually suppressed at temperatures, at which YIG/Pt reference samples still show a clearly measurable SSE voltage. The same trend is observed in the temperature dependent SMR measurements. In insulating AFMs spin transmission has been studied[1,2] and is explained by the AFM layer undergoing the phase transition from the paramagnetic into the antiferromagnetic state. To check for this possibility, temperature dependent SQUID magnetometry measurements are performed. [1] Qiu et al., Nat. Comm. 7, 12670 (2016) [2] Prakash et al., Phys. Rev. B 94, 014427 (2016)