Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.27: Poster
Tuesday, March 13, 2018, 09:30–13:00, Poster A
Modulation of spin-wave propagation with time-varying magnetic fields — Nana Nishida1, •Peter Matthies1, 2, Kai Wagner1, 2, Katrin Schultheiss1, and Helmut Schultheiss1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany — 2Technische Universität Dresden, Dresden, Germany
We investigated spin-wave propagation under the influence of nanosecond magnetic field pulses in a 2 µm wide spin-wave waveguide made from NiFe. A coplanar waveguide serves as an antenna for spin waves. The spin wave conduit is magnetized perpendicular to its long axis by an external magnetic field. In order to modulate the amplitude of the internal field, we apply 20 ns long current pulses to a gold conductor that was fabricated below the spin-wave waveguide.
The spin-wave intensity was measured using time-resolved Brillouin light scattering microscopy while applying current pulses with amplitudes that both increase and decrease the effective magnetic field. Depending on the applied microwave frequency, the initial magnetic field and the direction of the pulsed magnetic field different phenomena are observed: First, short spin-wave packets can be created when starting the field sequence off resonance. Second, a pulse induced shift of spin-wave frequencies is detected when starting at resonance, i.e., when propagating spin waves feel a time dependent magnetic field.