Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 66: Magnetic Heusler Materials, Semimetals und Oxides
(Joint session of MA and TT organized by MA)
TT 66.10: Vortrag
Donnerstag, 10. März 2016, 12:00–12:15, H34
Yttrium Iron Garnet Thin Films with Very Low Damping Obtained by Recrystallization of Amorphous Material — •Christoph Hauser1, Tim Richter1, Nico Homonnay1, Christian Eisenschmidt1, Hakan Deniz2, Dietrich Hesse2, Stefan Ebbinghaus1, and Georg Schmidt1 — 1Martin-Luther University Halle-Wittenberg, Halle, 06120, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, 06120, Germany
Yttrium Iron Garnet is a room temperature ferrimagnet, which has recently gained importance for magnonics [1]. For the integration into magnonic devices, however very thin films must be used which are mostly fabricated by pulsed laser deposition (PLD) and often suffer from increased damping. Using room temperature deposition and subsequent annealing in an oxygen atmosphere much lower damping can be achieved. For a 56 nm thick layer a damping constant of α =6.15· 10−5 and a linewidth as small as 1.30 Oe @9.6 GHz are obtained which are the lowest values for PLD grown thin films reported so far. Even for a 20 nm thick layer a damping constant of α =7.39· 10−5 is found. In this case the FMR linewidth is 3.49 Oe @9.6GHz. The layers show high crystalline quality and sub nanometer surface roughness in various structural characterizations. Our results not only present a method of depositing thin film YIG of unprecedented quality but also open up new options for the fabrication of thin film complex oxides or even other crystalline materials. We are going to present the results of various experiments using different layer thicknesses and annealing parameters. [1]Chumak et al. Nat. Commun. 5, 4700 (2014).