Berlin 2012 – wissenschaftliches Programm

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AGjDPG: Arbeitsgruppe junge DPG

AGjDPG 8: PhD Student Symposium: Spintronics on the Way to modern Storage Technology II

AGjDPG 8.5: 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.