Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: PhD Student Symposium: "Spintronics on the Way to modern Storage Technology II", Organization: "Univ. Mainz team"
MA 48.5: Topical Talk
Donnerstag, 29. März 2012, 14:30–15:00, BH 243
Magnetoelastic Magnetization Control and Magnetization Dynamics at Low Temperatures — •Hans Huebl1, Andreas Brandlmaier1, Christoph Zollitsch1, Johannes Lotze1, Mathias Weiler1, Fredrik Hocke1, Georg Woltersdorf2, Ruldof Gross1, and Sebastian T.B. Goennenwein1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Universität Regensburg, Regensburg, Germany
In magnetic storage applications magnetization direction manipulation and magnetization switching speed are two key parameters. While magnetization orientation is usually controlled by means of Oersted fields, magnetization control via elastic strain fields represents an alternative approach. Here, we implement such a "spin-mechanics" concept in a hybrid structure consisting of a ferromagnetic thin-film deposited onto a piezoelectric actuator. The combination of piezoelectric and magnetoelastic effects allows to change the magnetization orientation by up to 90∘ solely via the voltage applied to the actuator. In a second set of experiments, we investigate magnetization damping, which directly relates to the magnetization switching speed. We discuss broadband ferromagnetic resonance as a tool to investigate magnetization damping as a function of temperature between 300 K and 50 mK, and address the impact of photon-magnon coupling.
This work is supported by the Excellence Cluster "Nanosystems Initiative Munich (NIM)" and DFG SFB 631.