Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.21: Poster

Thursday, March 19, 2015, 15:00–18:00, Poster A

Circularly polarized microwave radiation for ferromagnetic resonance experiments — Hannes Maier-Flaig^1,2, •Sho D. Watanabe^1,2,3, Rudolf Gross^1,2,4, Hans Huebl^1,4, and Sebastian T. B. Goennenwein^1,4 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching — ²Physik-Department, TU München, 85748 Garching, Germany — ³Department of Physics, Keio University, 223-8522 Yokohama, Japan — ⁴Nanosystems Initiative Munich, 80799 München, Germany

Ferromagnetic resonance (FMR) is a widely applied spectroscopy method allowing to probe magnetization dynamics and the spin-wave spectrum of a ferromagnet. In conventional FMR setups, linearly polarized microwave radiation is used. In contrast, circularly polarized microwave magnetic fields allow to selectively excite a magnetic dipole transition with Δ m_s = ± 1. We follow the approach by Henderson et al. [1] for the generation of cicularly polarized microwave radiation, but apply this principle to coplanar waveguide stuctures. Circularly polarized microwave radiation is created in a structure composed of half-wavelength resonators, with a sample space of about 1.15 mm². We discuss the properties of our resonators and present first FMR spectra.

[1] J.J. Henderson et al., Rev. Sci. Instrum. 79, 074704 (2008).