Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Multiferroics
MA 38.16: Talk
Thursday, March 26, 2009, 19:15–19:30, HSZ 103
Voltage controlled inversion of magnetic anisotropy in Ni thin films — •Mathias Weiler1, Andreas Brandlmaier1, Stephan Geprägs1, Matthias Althammer1, Matthias Opel1, Christoph Bihler2, Hans Huebl2, Martin S. Brandt2, Rudolf Gross1,3, and Sebastian T. B. Goennenwein1,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Walter Schottky Institut, TU München, 85748 Garching, Germany — 3Physik-Department, TU München, 85748 Garching, Germany
The control of magnetic properties by means of an electric field is an important aspect in magnetism and magnetoelectronics. We here demonstrate a voltage control of magnetization orientation in Ni thin film/piezoelectric actuator hybrids via magnetoelastic coupling at room temperature [1]. Ferromagnetic resonance (FMR) spectroscopy shows that the in-plane uniaxial magnetic anisotropy of the Ni film is inverted upon changing the polarity of the voltage Vp applied to the actuator. Using SQUID magnetometry, we find that the magnetization orientation can be reversibly rotated in the Ni film plane within a range of approximately 70∘ by changing Vp alone – even at static external magnetic field strengths well below the Ni coercive field. All magnetometry data can be quantitatively modelled in a Stoner-Wohlfarth approach using the magnetic free energy determined from FMR.
We gratefully acknowledge financial support by the DFG via SPP 1157 (GR 1132/13), GO 944/3 and the German Excellence Initiative via the "Nanosystems Initiative Munich".
[1] M. Weiler et al. (2008) arXiv:0810.0389