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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.16: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Spin current experiments in Ga-doped Yttrium Iron Garnets — •Michaela Lammel1,2, Stephan Geprägs1, Matthias Opel1, Sebastian T.B. Goennenwein1,2,3, and Rudolf Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, Technische Universität München, 85748 Garching, Germany — 3Nanosystems Initiative Munich, 80799 München, Germany
Garnets, in particular yttrium iron garnet (YIG), are widely used for experiments with spin currents. A particularly interesting aspect hereby are the different sublattice magnetizations. To clarify the specific role of the magnetic moments of the two iron sub-lattices of YIG, we investigate gallium substituted YIG (Y3Fe5−xGaxO12, Ga:YIG) samples. Varying the Ga concentration, the compensation temperature Tcomp, at which the magnetic moments on the two iron sublattices cancel each other, can be tuned. We fabricated Ga:YIG thin films on Y3Al5O12 substrates by pulsed laser deposition (PLD). The crystalline quality was determined by high-resolution X-ray diffractometry. No parasitic phases could be detected and a high crystalline quality of the epitaxial films could be inferred from the small FWHM of the measured rocking curves. Using SQUID magnetometry, the temperature dependence of the magnetization was studied at different applied magnetic fields. Our results show that the compensation temperature Tcomp depends crucially on the deposition parameters. — This work is supported by the DFG via SPP 1538.