Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.4: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Phase-to-amplitude conversion by parallel parametric amplification of propagating spin waves in microstructured Ni₈₁Fe₁₉ waveguides — Thomas Brächer, •Frank Heussner, Philipp Pirro, Thomas Meyer, Alexander Serga, and Burkard Hillebrands — Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany

We report on controlling the intensity of a propagating spin wave after passing through a localized amplification area in a transversally magnetized Ni₈₁Fe₁₉ (Py) waveguide by phase matching. A microwave current inside a microstrip transmission line with a narrowing underneath the Py waveguide creates a locally enhanced dynamic magnetic field parallel to the static magnetization. By applying an alternating magnetic field of frequency 2f_SW, parametric interactions can lead to an amplification of a coherently excited spin wave of frequency f_SW. This effect is known as parallel parametric amplification (PPA).

The amplification is phase-sensitive, i.e., it depends on the phase difference ΔΦ between the phase Φ_2f of the magnetic pumping field and the phase Φ_f of the propagating spin wave. By utilizing Brillouin light scattering (BLS) microscopy, we demonstrate that the level of the transmitted spin-wave intensity behind the amplification area can be continuously tuned by adjusting the phase difference ΔΦ. The result of this work commends itself for applications in information processing as it allows for the realization of a phase-to-amplitude conversion based on phase-sensitive parallel parametric amplification.