SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Thin Films: Magnetic Coupling Phenomena / Exchange Bias

MA 5.5: Vortrag

Montag, 27. März 2023, 10:30–10:45, POT 6

Spin current generation in ferrimagnetic heterostructures — •Felix Fuhrmann¹, Sven Becker¹, Akashdeep Akashdeep¹, Zengyao Ren^1,2, Mathias Weiler³, Gerhard Jakob^1,2, and Mathias Kläui^1,2,4 — ¹Institute of Physics, University of Mainz, Germany — ²Graduate School of Excellence "Materials Science in Mainz" (MAINZ), Germany — ³Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany — ⁴Center for Quantum Spintronics, Norwegian University of Science and Technology, Trondheim, Norway

With growing demand for more energy-efficient information technology, the utilization of magnons as information carriers entails potential advantages [1]. To successfully develop magnon-based devices, there are several requirements for the applied materials to meet. The insulating ferrimagnet Yttrium Iron Garnet (Y₃Fe₅O₁₂, YIG) and related garnets are good candidates with outstanding low damping and large magnon propagation lengths [1]. Our heterostructures of YIG and Gadolinium Iron Garnet (Gd₃Fe₅O₁₂, GIG) were grown by pulsed laser deposition. We observe a ferromagnetic coupling between the Fe sublattices of the two layers, leading to complex magnetic response to external magnetic fields and a nontrivial temperature dependence [2]. We investigate the spin current generation by means of the spin Seebeck effect and spin pumping at ferromagnetic resonance. SQUID magnetometry and spin Hall magnetoresistance measurements support our observations [2]. [1] A. Chumak et al., Nat. Phys. 11, 453 (2015). [2] S. Becker et al., Phys. Rev. Appl., 16, 014047(2021).