Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Magnetic Heuslers, Half-Metals, Semiconductors, and Oxides (organized by MA)
TT 23.8: Vortrag
Montag, 16. März 2015, 16:45–17:00, H 1012
High quality Yttrium Iron Garnet grown by room temperature pulsed laser deposition and subsequent annealing — •Christoph Hauser1, Tim Richter1, Nico Homonnay1, Bodo Fuhrmann2, and Georg Schmidt1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle (Saale), Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle (Saale) , Germany
Yttrium Iron Garnet is a room temperature ferrimagnet, which has recently gained importance due to its application in spin pumping and the investigation of the inverse spin Hall effect [1]. The linewidth and damping which can be observed in ferromagnetic resonance are typically the most important quality criteria for YIG films. Ultrathin films with very low damping constants can been grown by pulsed laser deposition [2]. We have investigated different methods of PLD growth to obtain high quality YIG thin films. Using PLD at high substrate temperature, 20 nm thick YIG films with a FMR linewidth of 12 Oe at 9.6 GHz could be obtained. Even better quality is achieved when the YIG is deposited at room temperature and subsequently annealed in an oxygen atmosphere, where we can obtain a linewidth of less than 2 Oe at 9.6 GHz. The layers show high crystalline quality and sub-nanometer surface roughness in X-ray diffraction and reflectometry. We are going to present the results of various experiments using different layer thicknesses and annealing parameters. [1]K. Uchida et al., Appl. Phys. Lett. 97, 252504 (2010) [2]d'Allivy et al., Appl. Phys. Lett. 103, 82408 (2013)