Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.33: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
On-chip magnetic field bias for magnon-resonator experiments — •Stefan Eisele1, Tomislav Piskor1, Marco Pfirrmann1, Andre Schneider1, Hannes Rotzinger1, Alexey V. Ustinov1,3, and Martin Weides1,2 — 1Karlsruhe Institute of Technology, Germany — 2Johannes Gutenberg University Mainz, Germany — 3Russian Quantum Center, Moscow, Russia
Today, spin waves are considered as promising candidates for classical and quantum information processing. Their propagation properties are conventionally controlled through an external magnetic field bias to the ferromagnetic materials, generally generated by coils or permanent magnets. The high inductances of coils make manipulations on a short timescale impossible. Furthermore, the unconfined magnetic fields require shielding to avoid cross-bias of neighboring magnonic cells. In this work, we develop an on-chip magnetic field bias to overcome these constraints. For application in a cryogenic environment, i.e., in liquid helium at 4.2 K, very low heat dissipation is mandatory. Our system consists of a superconducting niobium feedline with a magnetic film deposited on top. The magnetic bias field is provided by the superconducting current. For on-chip ferromagnetic resonance measurements, an additional niobium feedline is added on top of the magnetic structure. Due to the small inductance of the biasing component, current variations on short timescales are achievable. This work enables combining novel compact magnonic circuits with electrical quantum circuits to process microwave signals in cryogenic environments.