SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.80: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Undirectional spin wave propagation mediated by Co₂₅Fe₇₅- and Ni₈₀Fe₂₀-nanogratings — •Monika Scheufele^1,2, Christian Mang^1,2, Manuel Müller^1,2, Johannes Weber^1,2, Vincent Haueise^1,2, Hans Huebl^1,2,3, Matthias Althammer^1,2, Stephan Geprägs¹, and Rudolf Gross^1,2,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany — ³Munich Center for Quantum Science and Technology (MCQST), Munich, Germany

The unidirectional propagation of spin waves provides novel functionalities for magnonic logic devices. Here, we report the fabrication of Co₂₅Fe₇₅ (CoFe)- and Ni₈₀Fe₂₀ (Py)-nanogratings via electron beam lithography and DC magnetron sputtering on yttrium iron garnet (YIG) and CoFe thin films, respectively. The dipolar magnetic coupling between the nanogratings and the continuous thin films induces a finite nonreciprocity of the spin wave propagation if the magnetization within the gratings and the thin films is collinear [1]. By performing broadband ferromagnetic resonance as well as spin wave spectroscopy, we study the coupled spin wave modes in these magnonic devices. Moreover, we compare the properties of the CoFe/YIG and Py/CoFe platforms and also compare them with micromagnetic simulations.
[1] J. Chen et al., Phys. Rev. B 100, 104427 (2019).