Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Thin Films: Magnetic Coupling Phenomena / Exchange Bias / Magnetic Anisotropy

MA 22.1: Vortrag

Mittwoch, 7. September 2022, 09:30–09:45, H47

Spin dynamics in coupled 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 an 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 dynamics by broadband ferromagnetic resonance (FMR) experiments. Our observations are corroborated by measurements of SQUID magnetometry, spin Hall magnetoresistance and spin Seebeck effect [2]. [1] A. Chumak et al., Nat. Phys, 11, 453 (2015). [2] S. Becker et al., Phys. Rev. Appl., 16, 014047(2021).