Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 Gross^1,2 — 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.