Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.60: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Magneto-dynamics of single crystal Gadolinium Iron Garnet — •Lukas Liensberger1,2, Hannes Maier-Flaig1,2, Andreas Erb1, Stephan Geprägs1,2, Sebastian T.B. Goennenwein1,2,3,4, Rudolf Gross1,2,4, Hans Huebl1,2,4, and Mathias Weiler1,2 — 1Walther-Meißner-Institut, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Institut für Festkörperphysik, Technische Universität Dresden, Germany — 4Nanosystems Initiative Munich, Munich, Germany
For many decades, the ability to tune the magneto-dynamical properties of doped rare-earth iron garnets has triggered a multitude of investigations and resulted in numerous applications.
One prime example for tunable magnetic properties in the iron garnets is Gadolinium Iron Garnet (GdIG) because its sublattice magnetizations can be controlled via temperature. In particular, the net magnetization Mnet of GdIG exhibits a compensation point at the so-called compensation temperature (Tcomp=289 K) where Mnet vanishes.
We present an investigation of the magneto-dynamics of a single crystal GdIG disk using broadband magnetic resonance in the microwave frequency range as a function of temperature. Our measurements reveal that the magnetic eigenmodes of GdIG show a distinct evolution with temperature. Below 270K, the Gd sub-lattice magnetization dominates the total GdIG moment and we mainly observe a ferromagnetic-like mode. Near Tcomp, the antiferromagnetic exchange modes of GdIG fall within our experimentally accessible frequency range. We quantitatively discuss the data and model the observed resonance modes.