Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.10: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Iron Garnet Thin Films for Spin Current-Based Experiments — •Francesco Della Coletta1, Sibylle Meyer1, Matthias Opel1, Sebastian T. B. Goennenwein1, Stephan Geprägs1, and Rudolf Gross1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, Technische Universität München, 85748 Garching, Germany
The generation and detection of pure spin currents are in the focus of present research. In ferromagnetic insulator (FMI)/non-magnetic metal (NM) bilayers, the (inter)conversion of spin and charge currents via the (inverse) spin Hall effect in the NM leads to a spin Hall magnetoresistance (SMR), resulting from reflection or absorption of spin current at the interface. The effect manifests itself in the dependence of the electrical resistivity of the NM on the magnetization orientation of the FMI. Candidates for room-temperature FMI layers are iron garnet A3Fe5O12 (AIG) thin films with A=Y,Gd. Using pulsed laser deposition, we fabricated epitaxial AIG thin films on Gd3Ga5O12 and Y3Al5O12 substrates. From X-ray diffractometry, we do not detect any secondary phases. Furthermore, a high structural quality and a low mosaic spread is demonstrated. Using SQUID magnetometry, a ferrimagnetic hysteresis with a saturation magnetization close to the bulk value of A3Fe5O12 (A=Y,Gd) is observed at room-temperature. Additionally, in case of A=Gd, a compensation temperature of around 290 K, where the remanent magnetization changes its sign, is detectable. — This work is supported by the DFG via SPP 1538.