Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Magnetic measurement methods
MA 15.7: Talk
Tuesday, March 17, 2015, 11:00–11:15, H 1012
All electrical coherent control of the magnetization in a thin Yttrium Iron Garnet film — •Olga Wid1, Martin Wahler1, Nico Homonnay1, Tim Richter1, 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
We have investigated the magnetic properties of Yttrium Iron Garnet (YIG) thin films using Time Domain Ferromagnetic Resonance (FMR). The sample is placed on a coplanar waveguide and a voltage step is used to induce a precession of the magnetization in the sample which is then detected by the induced voltage. A second voltage step which can be applied with variable time delay allows us to coherently control the precession. With suitable delay times the amplitude of the precession can either be maximized or the precession can be completely stopped. This method allows for a very precise investigation of the precession dynamics. The high quality of the YIG films (best FMR linewidth 2 Oe @ 9.6 GHz) permits us to observe the precession over a time of more than 50 ns (for comparison: Permalloy shows a precession over 5 ns). Our experiments are supported by micromagnetic dynamic simulations using OOMMF and MuMax2 which nicely confirm our experimental results.