Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnonics
MA 8.6: Vortrag
Montag, 1. April 2019, 16:15–16:30, H52
Free standing 3D yttrium iron garnet nanobridges with very low Gilbert damping fabricated by room temperature laser deposition. — •Philip Trempler1, Christoph Hauser1, Philipp Geyer1, Rouven Dreyer1, Frank Heyroth2, and Georg Schmidt1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, MLU Halle-Wittenberg, Germany
We have fabricated YIG nanobridges by electron beam lithography and room temperature laser deposition with subsequent recrystallization [1]. The structures are monocrystalline except for a single defect in the center of the span. In ferromagnetic resonance the linewidth is 140 *T at 8 GHz and the Gilbert damping can be as low as 2x10-4. Investigations with spatially and time resolved magneto-optic Kerr effect (TR-MOKE) show various resonant magnon modes in the 3D nanobridges. Additionally inductively detected FMR was performed on single YIG bridges confirming the low damping which is in the range typically known for high quality PLD grown YIG thin films. This makes these YIG bridges perfect candidates for more complex spintronic devices where coupling of magnons and mechanical oscillations is utilized [2]. By coupling these excitations to Qubits the structures may ultimately be used in transmons for quantum information processing [3].
[1] Heyroth, F., et al., arXiv:1802.03176 (2018)
[2] Tabuchi, Yutaka, et al, Phys. Rev. Lett. 113.8 (2014)
[3] Zhang, Xufeng, et al., Phys. Rev. Lett. 113.15 (2014)